Doping effect of Nb on ionic polarization of SrTiO3
THz dielectric spectra of Nb-doped SrTiO3 single crystals were measured using the far-infrared spectroscopic ellipsometer to understand the doping effect of Nb on ionic polarization. The frequency of the Slater transverse optical (TO) mode increased with the doping amount of Nb, meaning the decrease...
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| Veröffentlicht in: | Journal of the Ceramic Society of Japan 2019/06/01, Vol.127(6), pp.357-361 |
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| container_title | Journal of the Ceramic Society of Japan |
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| creator | NISHIYAMA, Junji KANEHARA, Kazuki TAKEDA, Hiroaki TSURUMI, Takaaki HOSHINA, Takuya |
| description | THz dielectric spectra of Nb-doped SrTiO3 single crystals were measured using the far-infrared spectroscopic ellipsometer to understand the doping effect of Nb on ionic polarization. The frequency of the Slater transverse optical (TO) mode increased with the doping amount of Nb, meaning the decrease in the ionic polarization by Nb doping. From the change in the Slater TO mode frequency, it was estimated that the ionic polarizability of 1% Nb-doped SrTiO3 was 10.4% lower than that of undoped SrTiO3. This result suggested that the intrinsic permittivity of Nb-doped SrTiO3 is lower than that of that of undoped SrTiO3. First principles calculations revealed that the Nb 4d-orbitals contributes to the covalency between B-site cations and O ions, however, the covalency is suppressed due to the electron carrier doping. The doped electrons causes the decrease in the long-range Coulomb force and the increase in short-range elastic force, and therefore the ionic polarizability is decreased by Nb doping. |
| doi_str_mv | 10.2109/jcersj2.19031 |
| format | Article |
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The frequency of the Slater transverse optical (TO) mode increased with the doping amount of Nb, meaning the decrease in the ionic polarization by Nb doping. From the change in the Slater TO mode frequency, it was estimated that the ionic polarizability of 1% Nb-doped SrTiO3 was 10.4% lower than that of undoped SrTiO3. This result suggested that the intrinsic permittivity of Nb-doped SrTiO3 is lower than that of that of undoped SrTiO3. First principles calculations revealed that the Nb 4d-orbitals contributes to the covalency between B-site cations and O ions, however, the covalency is suppressed due to the electron carrier doping. The doped electrons causes the decrease in the long-range Coulomb force and the increase in short-range elastic force, and therefore the ionic polarizability is decreased by Nb doping.</description><identifier>ISSN: 1882-0743</identifier><identifier>EISSN: 1348-6535</identifier><identifier>DOI: 10.2109/jcersj2.19031</identifier><language>eng</language><publisher>Tokyo: The Ceramic Society of Japan</publisher><subject>Dielectric property ; Doping ; Ellipsometer ; Far infrared radiation ; First principles ; First-principles calculation ; Ionic polarization ; Niobium ; Polarization ; Single crystals ; Strontium titanate ; Strontium titanates ; THz response</subject><ispartof>Journal of the Ceramic Society of Japan, 2019/06/01, Vol.127(6), pp.357-361</ispartof><rights>2019 The Ceramic Society of Japan</rights><rights>Copyright Japan Science and Technology Agency 2019</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c494t-5f83e6f92a57a91f1ad7b1a0dbd82f09fe9c1712b0cb52b9019b16f3d912d2e43</citedby><cites>FETCH-LOGICAL-c494t-5f83e6f92a57a91f1ad7b1a0dbd82f09fe9c1712b0cb52b9019b16f3d912d2e43</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,1883,27924,27925</link.rule.ids></links><search><creatorcontrib>NISHIYAMA, Junji</creatorcontrib><creatorcontrib>KANEHARA, Kazuki</creatorcontrib><creatorcontrib>TAKEDA, Hiroaki</creatorcontrib><creatorcontrib>TSURUMI, Takaaki</creatorcontrib><creatorcontrib>HOSHINA, Takuya</creatorcontrib><title>Doping effect of Nb on ionic polarization of SrTiO3</title><title>Journal of the Ceramic Society of Japan</title><addtitle>J. Ceram. Soc. Japan</addtitle><description>THz dielectric spectra of Nb-doped SrTiO3 single crystals were measured using the far-infrared spectroscopic ellipsometer to understand the doping effect of Nb on ionic polarization. The frequency of the Slater transverse optical (TO) mode increased with the doping amount of Nb, meaning the decrease in the ionic polarization by Nb doping. From the change in the Slater TO mode frequency, it was estimated that the ionic polarizability of 1% Nb-doped SrTiO3 was 10.4% lower than that of undoped SrTiO3. This result suggested that the intrinsic permittivity of Nb-doped SrTiO3 is lower than that of that of undoped SrTiO3. First principles calculations revealed that the Nb 4d-orbitals contributes to the covalency between B-site cations and O ions, however, the covalency is suppressed due to the electron carrier doping. The doped electrons causes the decrease in the long-range Coulomb force and the increase in short-range elastic force, and therefore the ionic polarizability is decreased by Nb doping.</description><subject>Dielectric property</subject><subject>Doping</subject><subject>Ellipsometer</subject><subject>Far infrared radiation</subject><subject>First principles</subject><subject>First-principles calculation</subject><subject>Ionic polarization</subject><subject>Niobium</subject><subject>Polarization</subject><subject>Single crystals</subject><subject>Strontium titanate</subject><subject>Strontium titanates</subject><subject>THz response</subject><issn>1882-0743</issn><issn>1348-6535</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><recordid>eNpFkElPwzAQhS0EEqVw5B6Jc4pnnMU-olIWqaIHytmyHbskKnGw0wP8etK0KpdZ9L55Iz1CboHOEKi4b4wNscEZCMrgjEyAZTwtcpafDzPnmNIyY5fkKsaG0gIzxieEPfqubjeJdc6aPvEuedOJb5Pat7VJOr9Vof5V_bDutfewrlfsmlw4tY325tin5ONpsZ6_pMvV8-v8YZmaTGR9mjvObOEEqrxUAhyoqtSgaKUrjo4KZ4WBElBTo3PUgoLQUDhWCcAKbcam5O7g2wX_vbOxl43fhXZ4KRF5SXMqOA5UeqBM8DEG62QX6i8VfiRQuc9FHnORYy4DvzjwTezVxp5oFfrabO0_jaUsxjrenXTzqYK0LfsDlC1t-Q</recordid><startdate>20190601</startdate><enddate>20190601</enddate><creator>NISHIYAMA, Junji</creator><creator>KANEHARA, Kazuki</creator><creator>TAKEDA, Hiroaki</creator><creator>TSURUMI, Takaaki</creator><creator>HOSHINA, Takuya</creator><general>The Ceramic Society of Japan</general><general>Japan Science and Technology Agency</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7QQ</scope><scope>7SR</scope><scope>8FD</scope><scope>JG9</scope></search><sort><creationdate>20190601</creationdate><title>Doping effect of Nb on ionic polarization of SrTiO3</title><author>NISHIYAMA, Junji ; KANEHARA, Kazuki ; TAKEDA, Hiroaki ; TSURUMI, Takaaki ; HOSHINA, Takuya</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c494t-5f83e6f92a57a91f1ad7b1a0dbd82f09fe9c1712b0cb52b9019b16f3d912d2e43</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><topic>Dielectric property</topic><topic>Doping</topic><topic>Ellipsometer</topic><topic>Far infrared radiation</topic><topic>First principles</topic><topic>First-principles calculation</topic><topic>Ionic polarization</topic><topic>Niobium</topic><topic>Polarization</topic><topic>Single crystals</topic><topic>Strontium titanate</topic><topic>Strontium titanates</topic><topic>THz response</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>NISHIYAMA, Junji</creatorcontrib><creatorcontrib>KANEHARA, Kazuki</creatorcontrib><creatorcontrib>TAKEDA, Hiroaki</creatorcontrib><creatorcontrib>TSURUMI, Takaaki</creatorcontrib><creatorcontrib>HOSHINA, Takuya</creatorcontrib><collection>CrossRef</collection><collection>Ceramic Abstracts</collection><collection>Engineered Materials Abstracts</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><jtitle>Journal of the Ceramic Society of Japan</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>NISHIYAMA, Junji</au><au>KANEHARA, Kazuki</au><au>TAKEDA, Hiroaki</au><au>TSURUMI, Takaaki</au><au>HOSHINA, Takuya</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Doping effect of Nb on ionic polarization of SrTiO3</atitle><jtitle>Journal of the Ceramic Society of Japan</jtitle><addtitle>J. Ceram. Soc. Japan</addtitle><date>2019-06-01</date><risdate>2019</risdate><volume>127</volume><issue>6</issue><spage>357</spage><epage>361</epage><pages>357-361</pages><issn>1882-0743</issn><eissn>1348-6535</eissn><abstract>THz dielectric spectra of Nb-doped SrTiO3 single crystals were measured using the far-infrared spectroscopic ellipsometer to understand the doping effect of Nb on ionic polarization. The frequency of the Slater transverse optical (TO) mode increased with the doping amount of Nb, meaning the decrease in the ionic polarization by Nb doping. From the change in the Slater TO mode frequency, it was estimated that the ionic polarizability of 1% Nb-doped SrTiO3 was 10.4% lower than that of undoped SrTiO3. This result suggested that the intrinsic permittivity of Nb-doped SrTiO3 is lower than that of that of undoped SrTiO3. First principles calculations revealed that the Nb 4d-orbitals contributes to the covalency between B-site cations and O ions, however, the covalency is suppressed due to the electron carrier doping. The doped electrons causes the decrease in the long-range Coulomb force and the increase in short-range elastic force, and therefore the ionic polarizability is decreased by Nb doping.</abstract><cop>Tokyo</cop><pub>The Ceramic Society of Japan</pub><doi>10.2109/jcersj2.19031</doi><tpages>5</tpages><oa>free_for_read</oa></addata></record> |
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| subjects | Dielectric property Doping Ellipsometer Far infrared radiation First principles First-principles calculation Ionic polarization Niobium Polarization Single crystals Strontium titanate Strontium titanates THz response |
| title | Doping effect of Nb on ionic polarization of SrTiO3 |
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