Effect of Zn and Ca modifications on crystallization and microwave dielectric properties of lanthanum borates
▶ Low loss dielectrics based on two borate glass systems, (13–19)CaO·(13–19)La 2O 3·68B 2O 3 and (13–19)ZnO·(13–19)La 2O 3·68B 2O 3, are investigated by focusing on effects of the CaO/La 2O 3 and ZnO/La 2O 3 ratios on the physical and dielectric properties. Identical compositions have not been repor...
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| Veröffentlicht in: | Journal of alloys and compounds 2011-01, Vol.509 (3), p.849-853 |
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| creator | Jo, Yeon Hwa Doo, Sae Han Na Lee, Joon Seok Mohanty, Bhaskar C. Cho, Yong Soo |
| description | ▶ Low loss dielectrics based on two borate glass systems, (13–19)CaO·(13–19)La
2O
3·68B
2O
3 and (13–19)ZnO·(13–19)La
2O
3·68B
2O
3, are investigated by focusing on effects of the CaO/La
2O
3 and ZnO/La
2O
3 ratios on the physical and dielectric properties. Identical compositions have not been reported so far. ▶ The effects of increasing the relative content of Ca and Zn were found to be opposite specifically in microstructure evolution and crystallization behavior, and, thus, dielectric properties. It suggests that the glass modifiers can be very critical in controlling the densification and crystallization behavior. ▶ In the CaO·La
2O
3·B
2O
3 samples, the lower content of Ca is preferred since densification is enhanced and more LaBO
3 phase is produced. ▶ In the ZnO·La
2O
3·B
2O
3 samples, on the contrary, the higher content of Zn seems to be more effective in generating a larger difference between the softening and crystallization temperatures, and, hence, better densification with least porosity. ▶ As the best glass composition, 19ZnO·13La
2O
3·68B
2O
3 having the increased content of the LaAl
2.03(B
4O
10)O
0.54 phase exhibited promising dielectric properties of
k
∼
7.4 and
Q
×
f
∼
18,100.
Low loss dielectrics based on two borate glasses, (13–19)CaO·(13–19)La
2O
3·68B
2O
3 and (13–19)ZnO·(13–19)La
2O
3·68B
2O
3, have been investigated with a focus on effects of the CaO/La
2O
3 and ZnO/La
2O
3 ratios on physical and dielectric properties. All samples were prepared by mixing glass with 40 wt% Al
2O
3 filler and by firing at 850
°C for 30
min. The effects of increasing relative contents of Ca and Zn were found to be opposite specifically in microstructure evolution and crystallization behavior, and thus, dielectric properties. For example, the 13CaO·19La
2O
3·B
2O
3 sample having the lowest Ca content showed the highest
Q
×
f of ∼8100, while the 19ZnO·13La
2O
3·B
2O
3 sample having the highest Zn content showed the highest
Q
×
f of ∼18,100. The extensive crystallization of low loss phases, i.e., LaBO
3 and LaAl
2.03(B
4O
10)O
0.54, as well as the improved level of densification are assumed to be responsible for better dielectric performance. |
| doi_str_mv | 10.1016/j.jallcom.2010.09.110 |
| format | Article |
| fullrecord | <record><control><sourceid>proquest_cross</sourceid><recordid>TN_cdi_proquest_miscellaneous_849478611</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><els_id>S0925838810023376</els_id><sourcerecordid>1762115953</sourcerecordid><originalsourceid>FETCH-LOGICAL-c404t-8cef9f5ec4b8f848b1f44af01019276d7e83b31dfb0bbdb1e08b7058c0e27fb83</originalsourceid><addsrcrecordid>eNqFkU-LFDEQxYMoOK5-BCEX0UvPVnXS3clJZFj_wIIXvXgJSbqCGbo7Y9Kzsn56MzuDR_dUUPzqvap6jL1G2CJgf73f7u00-TRvW6g90FtEeMI2qAbRyL7XT9kGdNs1Sij1nL0oZQ8AqAVu2HwTAvmVp8B_LNwuI99ZPqcxhujtGtNSeFq4z_dlrR7xz0PvgZujz-m3vSM-RpqqRo6eH3I6UF4jlZPiZJf1p12OM3cp25XKS_Ys2KnQq0u9Yt8_3nzbfW5uv376svtw23gJcm2Up6BDR146FZRUDoOUNtTjULdDPw6khBM4BgfOjQ4JlBugUx6oHYJT4oq9PevWfX4dqaxmjsXTVBeidCxGSS0H1SNW8t1_SRz6FrHTnahod0br3aVkCuaQ42zzvUEwpyDM3lyCMKcgDGhTg6hzby4Wtng7hWwXH8u_4VYMnYD-xL0_c1Q_cxcpm-IjLZ7GmOt7zZjiI05_AYsIoyI</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>1762115953</pqid></control><display><type>article</type><title>Effect of Zn and Ca modifications on crystallization and microwave dielectric properties of lanthanum borates</title><source>Elsevier ScienceDirect Journals</source><creator>Jo, Yeon Hwa ; Doo, Sae Han Na ; Lee, Joon Seok ; Mohanty, Bhaskar C. ; Cho, Yong Soo</creator><creatorcontrib>Jo, Yeon Hwa ; Doo, Sae Han Na ; Lee, Joon Seok ; Mohanty, Bhaskar C. ; Cho, Yong Soo</creatorcontrib><description>▶ Low loss dielectrics based on two borate glass systems, (13–19)CaO·(13–19)La
2O
3·68B
2O
3 and (13–19)ZnO·(13–19)La
2O
3·68B
2O
3, are investigated by focusing on effects of the CaO/La
2O
3 and ZnO/La
2O
3 ratios on the physical and dielectric properties. Identical compositions have not been reported so far. ▶ The effects of increasing the relative content of Ca and Zn were found to be opposite specifically in microstructure evolution and crystallization behavior, and, thus, dielectric properties. It suggests that the glass modifiers can be very critical in controlling the densification and crystallization behavior. ▶ In the CaO·La
2O
3·B
2O
3 samples, the lower content of Ca is preferred since densification is enhanced and more LaBO
3 phase is produced. ▶ In the ZnO·La
2O
3·B
2O
3 samples, on the contrary, the higher content of Zn seems to be more effective in generating a larger difference between the softening and crystallization temperatures, and, hence, better densification with least porosity. ▶ As the best glass composition, 19ZnO·13La
2O
3·68B
2O
3 having the increased content of the LaAl
2.03(B
4O
10)O
0.54 phase exhibited promising dielectric properties of
k
∼
7.4 and
Q
×
f
∼
18,100.
Low loss dielectrics based on two borate glasses, (13–19)CaO·(13–19)La
2O
3·68B
2O
3 and (13–19)ZnO·(13–19)La
2O
3·68B
2O
3, have been investigated with a focus on effects of the CaO/La
2O
3 and ZnO/La
2O
3 ratios on physical and dielectric properties. All samples were prepared by mixing glass with 40 wt% Al
2O
3 filler and by firing at 850
°C for 30
min. The effects of increasing relative contents of Ca and Zn were found to be opposite specifically in microstructure evolution and crystallization behavior, and thus, dielectric properties. For example, the 13CaO·19La
2O
3·B
2O
3 sample having the lowest Ca content showed the highest
Q
×
f of ∼8100, while the 19ZnO·13La
2O
3·B
2O
3 sample having the highest Zn content showed the highest
Q
×
f of ∼18,100. The extensive crystallization of low loss phases, i.e., LaBO
3 and LaAl
2.03(B
4O
10)O
0.54, as well as the improved level of densification are assumed to be responsible for better dielectric performance.</description><identifier>ISSN: 0925-8388</identifier><identifier>EISSN: 1873-4669</identifier><identifier>DOI: 10.1016/j.jallcom.2010.09.110</identifier><language>eng</language><publisher>Kidlington: Elsevier B.V</publisher><subject>Borates ; Condensed matter: electronic structure, electrical, magnetic, and optical properties ; Condensed matter: structure, mechanical and thermal properties ; Cross-disciplinary physics: materials science; rheology ; Crystallization ; Dielectric loss and relaxation ; Dielectric properties ; Dielectric properties of solids and liquids ; Dielectrics, piezoelectrics, and ferroelectrics and their properties ; Equations of state, phase equilibria, and phase transitions ; Evolution ; Exact sciences and technology ; Glass ; Glasses (including metallic glasses) ; Glass–ceramic ; Growth from solid phases (including multiphase diffusion and recrystallization) ; Lanthanum borates ; Materials science ; Methods of crystal growth; physics of crystal growth ; Microwave dielectrics ; Microwaves ; Phases ; Physics ; Solid-solid transitions ; Specific materials ; Specific phase transitions ; Zinc</subject><ispartof>Journal of alloys and compounds, 2011-01, Vol.509 (3), p.849-853</ispartof><rights>2010 Elsevier B.V.</rights><rights>2015 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c404t-8cef9f5ec4b8f848b1f44af01019276d7e83b31dfb0bbdb1e08b7058c0e27fb83</citedby><cites>FETCH-LOGICAL-c404t-8cef9f5ec4b8f848b1f44af01019276d7e83b31dfb0bbdb1e08b7058c0e27fb83</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.sciencedirect.com/science/article/pii/S0925838810023376$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,776,780,3537,27901,27902,65534</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=23753060$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Jo, Yeon Hwa</creatorcontrib><creatorcontrib>Doo, Sae Han Na</creatorcontrib><creatorcontrib>Lee, Joon Seok</creatorcontrib><creatorcontrib>Mohanty, Bhaskar C.</creatorcontrib><creatorcontrib>Cho, Yong Soo</creatorcontrib><title>Effect of Zn and Ca modifications on crystallization and microwave dielectric properties of lanthanum borates</title><title>Journal of alloys and compounds</title><description>▶ Low loss dielectrics based on two borate glass systems, (13–19)CaO·(13–19)La
2O
3·68B
2O
3 and (13–19)ZnO·(13–19)La
2O
3·68B
2O
3, are investigated by focusing on effects of the CaO/La
2O
3 and ZnO/La
2O
3 ratios on the physical and dielectric properties. Identical compositions have not been reported so far. ▶ The effects of increasing the relative content of Ca and Zn were found to be opposite specifically in microstructure evolution and crystallization behavior, and, thus, dielectric properties. It suggests that the glass modifiers can be very critical in controlling the densification and crystallization behavior. ▶ In the CaO·La
2O
3·B
2O
3 samples, the lower content of Ca is preferred since densification is enhanced and more LaBO
3 phase is produced. ▶ In the ZnO·La
2O
3·B
2O
3 samples, on the contrary, the higher content of Zn seems to be more effective in generating a larger difference between the softening and crystallization temperatures, and, hence, better densification with least porosity. ▶ As the best glass composition, 19ZnO·13La
2O
3·68B
2O
3 having the increased content of the LaAl
2.03(B
4O
10)O
0.54 phase exhibited promising dielectric properties of
k
∼
7.4 and
Q
×
f
∼
18,100.
Low loss dielectrics based on two borate glasses, (13–19)CaO·(13–19)La
2O
3·68B
2O
3 and (13–19)ZnO·(13–19)La
2O
3·68B
2O
3, have been investigated with a focus on effects of the CaO/La
2O
3 and ZnO/La
2O
3 ratios on physical and dielectric properties. All samples were prepared by mixing glass with 40 wt% Al
2O
3 filler and by firing at 850
°C for 30
min. The effects of increasing relative contents of Ca and Zn were found to be opposite specifically in microstructure evolution and crystallization behavior, and thus, dielectric properties. For example, the 13CaO·19La
2O
3·B
2O
3 sample having the lowest Ca content showed the highest
Q
×
f of ∼8100, while the 19ZnO·13La
2O
3·B
2O
3 sample having the highest Zn content showed the highest
Q
×
f of ∼18,100. The extensive crystallization of low loss phases, i.e., LaBO
3 and LaAl
2.03(B
4O
10)O
0.54, as well as the improved level of densification are assumed to be responsible for better dielectric performance.</description><subject>Borates</subject><subject>Condensed matter: electronic structure, electrical, magnetic, and optical properties</subject><subject>Condensed matter: structure, mechanical and thermal properties</subject><subject>Cross-disciplinary physics: materials science; rheology</subject><subject>Crystallization</subject><subject>Dielectric loss and relaxation</subject><subject>Dielectric properties</subject><subject>Dielectric properties of solids and liquids</subject><subject>Dielectrics, piezoelectrics, and ferroelectrics and their properties</subject><subject>Equations of state, phase equilibria, and phase transitions</subject><subject>Evolution</subject><subject>Exact sciences and technology</subject><subject>Glass</subject><subject>Glasses (including metallic glasses)</subject><subject>Glass–ceramic</subject><subject>Growth from solid phases (including multiphase diffusion and recrystallization)</subject><subject>Lanthanum borates</subject><subject>Materials science</subject><subject>Methods of crystal growth; physics of crystal growth</subject><subject>Microwave dielectrics</subject><subject>Microwaves</subject><subject>Phases</subject><subject>Physics</subject><subject>Solid-solid transitions</subject><subject>Specific materials</subject><subject>Specific phase transitions</subject><subject>Zinc</subject><issn>0925-8388</issn><issn>1873-4669</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2011</creationdate><recordtype>article</recordtype><recordid>eNqFkU-LFDEQxYMoOK5-BCEX0UvPVnXS3clJZFj_wIIXvXgJSbqCGbo7Y9Kzsn56MzuDR_dUUPzqvap6jL1G2CJgf73f7u00-TRvW6g90FtEeMI2qAbRyL7XT9kGdNs1Sij1nL0oZQ8AqAVu2HwTAvmVp8B_LNwuI99ZPqcxhujtGtNSeFq4z_dlrR7xz0PvgZujz-m3vSM-RpqqRo6eH3I6UF4jlZPiZJf1p12OM3cp25XKS_Ys2KnQq0u9Yt8_3nzbfW5uv376svtw23gJcm2Up6BDR146FZRUDoOUNtTjULdDPw6khBM4BgfOjQ4JlBugUx6oHYJT4oq9PevWfX4dqaxmjsXTVBeidCxGSS0H1SNW8t1_SRz6FrHTnahod0br3aVkCuaQ42zzvUEwpyDM3lyCMKcgDGhTg6hzby4Wtng7hWwXH8u_4VYMnYD-xL0_c1Q_cxcpm-IjLZ7GmOt7zZjiI05_AYsIoyI</recordid><startdate>20110121</startdate><enddate>20110121</enddate><creator>Jo, Yeon Hwa</creator><creator>Doo, Sae Han Na</creator><creator>Lee, Joon Seok</creator><creator>Mohanty, Bhaskar C.</creator><creator>Cho, Yong Soo</creator><general>Elsevier B.V</general><general>Elsevier</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope></search><sort><creationdate>20110121</creationdate><title>Effect of Zn and Ca modifications on crystallization and microwave dielectric properties of lanthanum borates</title><author>Jo, Yeon Hwa ; Doo, Sae Han Na ; Lee, Joon Seok ; Mohanty, Bhaskar C. ; Cho, Yong Soo</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c404t-8cef9f5ec4b8f848b1f44af01019276d7e83b31dfb0bbdb1e08b7058c0e27fb83</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2011</creationdate><topic>Borates</topic><topic>Condensed matter: electronic structure, electrical, magnetic, and optical properties</topic><topic>Condensed matter: structure, mechanical and thermal properties</topic><topic>Cross-disciplinary physics: materials science; rheology</topic><topic>Crystallization</topic><topic>Dielectric loss and relaxation</topic><topic>Dielectric properties</topic><topic>Dielectric properties of solids and liquids</topic><topic>Dielectrics, piezoelectrics, and ferroelectrics and their properties</topic><topic>Equations of state, phase equilibria, and phase transitions</topic><topic>Evolution</topic><topic>Exact sciences and technology</topic><topic>Glass</topic><topic>Glasses (including metallic glasses)</topic><topic>Glass–ceramic</topic><topic>Growth from solid phases (including multiphase diffusion and recrystallization)</topic><topic>Lanthanum borates</topic><topic>Materials science</topic><topic>Methods of crystal growth; physics of crystal growth</topic><topic>Microwave dielectrics</topic><topic>Microwaves</topic><topic>Phases</topic><topic>Physics</topic><topic>Solid-solid transitions</topic><topic>Specific materials</topic><topic>Specific phase transitions</topic><topic>Zinc</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Jo, Yeon Hwa</creatorcontrib><creatorcontrib>Doo, Sae Han Na</creatorcontrib><creatorcontrib>Lee, Joon Seok</creatorcontrib><creatorcontrib>Mohanty, Bhaskar C.</creatorcontrib><creatorcontrib>Cho, Yong Soo</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><jtitle>Journal of alloys and compounds</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Jo, Yeon Hwa</au><au>Doo, Sae Han Na</au><au>Lee, Joon Seok</au><au>Mohanty, Bhaskar C.</au><au>Cho, Yong Soo</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Effect of Zn and Ca modifications on crystallization and microwave dielectric properties of lanthanum borates</atitle><jtitle>Journal of alloys and compounds</jtitle><date>2011-01-21</date><risdate>2011</risdate><volume>509</volume><issue>3</issue><spage>849</spage><epage>853</epage><pages>849-853</pages><issn>0925-8388</issn><eissn>1873-4669</eissn><abstract>▶ Low loss dielectrics based on two borate glass systems, (13–19)CaO·(13–19)La
2O
3·68B
2O
3 and (13–19)ZnO·(13–19)La
2O
3·68B
2O
3, are investigated by focusing on effects of the CaO/La
2O
3 and ZnO/La
2O
3 ratios on the physical and dielectric properties. Identical compositions have not been reported so far. ▶ The effects of increasing the relative content of Ca and Zn were found to be opposite specifically in microstructure evolution and crystallization behavior, and, thus, dielectric properties. It suggests that the glass modifiers can be very critical in controlling the densification and crystallization behavior. ▶ In the CaO·La
2O
3·B
2O
3 samples, the lower content of Ca is preferred since densification is enhanced and more LaBO
3 phase is produced. ▶ In the ZnO·La
2O
3·B
2O
3 samples, on the contrary, the higher content of Zn seems to be more effective in generating a larger difference between the softening and crystallization temperatures, and, hence, better densification with least porosity. ▶ As the best glass composition, 19ZnO·13La
2O
3·68B
2O
3 having the increased content of the LaAl
2.03(B
4O
10)O
0.54 phase exhibited promising dielectric properties of
k
∼
7.4 and
Q
×
f
∼
18,100.
Low loss dielectrics based on two borate glasses, (13–19)CaO·(13–19)La
2O
3·68B
2O
3 and (13–19)ZnO·(13–19)La
2O
3·68B
2O
3, have been investigated with a focus on effects of the CaO/La
2O
3 and ZnO/La
2O
3 ratios on physical and dielectric properties. All samples were prepared by mixing glass with 40 wt% Al
2O
3 filler and by firing at 850
°C for 30
min. The effects of increasing relative contents of Ca and Zn were found to be opposite specifically in microstructure evolution and crystallization behavior, and thus, dielectric properties. For example, the 13CaO·19La
2O
3·B
2O
3 sample having the lowest Ca content showed the highest
Q
×
f of ∼8100, while the 19ZnO·13La
2O
3·B
2O
3 sample having the highest Zn content showed the highest
Q
×
f of ∼18,100. The extensive crystallization of low loss phases, i.e., LaBO
3 and LaAl
2.03(B
4O
10)O
0.54, as well as the improved level of densification are assumed to be responsible for better dielectric performance.</abstract><cop>Kidlington</cop><pub>Elsevier B.V</pub><doi>10.1016/j.jallcom.2010.09.110</doi><tpages>5</tpages></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 0925-8388 |
| ispartof | Journal of alloys and compounds, 2011-01, Vol.509 (3), p.849-853 |
| issn | 0925-8388 1873-4669 |
| language | eng |
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| source | Elsevier ScienceDirect Journals |
| subjects | Borates Condensed matter: electronic structure, electrical, magnetic, and optical properties Condensed matter: structure, mechanical and thermal properties Cross-disciplinary physics: materials science rheology Crystallization Dielectric loss and relaxation Dielectric properties Dielectric properties of solids and liquids Dielectrics, piezoelectrics, and ferroelectrics and their properties Equations of state, phase equilibria, and phase transitions Evolution Exact sciences and technology Glass Glasses (including metallic glasses) Glass–ceramic Growth from solid phases (including multiphase diffusion and recrystallization) Lanthanum borates Materials science Methods of crystal growth physics of crystal growth Microwave dielectrics Microwaves Phases Physics Solid-solid transitions Specific materials Specific phase transitions Zinc |
| title | Effect of Zn and Ca modifications on crystallization and microwave dielectric properties of lanthanum borates |
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