Synthesis, Crystal Structure, and Magnetic Properties of Pyrochlore‐Type Eu2Ta2(O,N)7+δ
Pyrochlore‐type Eu2Ta2(O,N)7+δ phases were prepared by reaction of ammonia with an amorphous europium tantalum oxide precursor. 151Eu Mössbauer and EPR spectroscopy as well as magnetic susceptibility measurements point to the presence of exclusively Eu3+. For phase‐pure samples (X‐ray powder diffrac...
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| Veröffentlicht in: | Zeitschrift für anorganische und allgemeine Chemie (1950) 2017-12, Vol.643 (23), p.1824-1830 |
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| container_title | Zeitschrift für anorganische und allgemeine Chemie (1950) |
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| creator | Anke, Björn Hund, Sophie Lorent, Christian Janka, Oliver Block, Theresa Pöttgen, Rainer Lerch, Martin |
| description | Pyrochlore‐type Eu2Ta2(O,N)7+δ phases were prepared by reaction of ammonia with an amorphous europium tantalum oxide precursor. 151Eu Mössbauer and EPR spectroscopy as well as magnetic susceptibility measurements point to the presence of exclusively Eu3+. For phase‐pure samples (X‐ray powder diffraction), the nitrogen content varies between 1.0 and 1.8 wt %, leading to compositions in the range Eu2Ta2O7.1N0.6 – Eu2Ta2O6.5N1.0. Pyrochlore‐type phases are structurally derived from the fluorite type with 1/8 of the anions missing, resulting in an ideal composition A2B2X7. In Eu2Ta2(O,N)7+δ the excess anions partly occupy these vacancies. The prepared phases are colorless with a direct optical bandgap of 4.3 eV and they show the typical Van Vleck paramagnetic behavior known for trivalent Eu atoms. |
| doi_str_mv | 10.1002/zaac.201700024 |
| format | Article |
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For phase‐pure samples (X‐ray powder diffraction), the nitrogen content varies between 1.0 and 1.8 wt %, leading to compositions in the range Eu2Ta2O7.1N0.6 – Eu2Ta2O6.5N1.0. Pyrochlore‐type phases are structurally derived from the fluorite type with 1/8 of the anions missing, resulting in an ideal composition A2B2X7. In Eu2Ta2(O,N)7+δ the excess anions partly occupy these vacancies. The prepared phases are colorless with a direct optical bandgap of 4.3 eV and they show the typical Van Vleck paramagnetic behavior known for trivalent Eu atoms.</description><identifier>ISSN: 0044-2313</identifier><identifier>EISSN: 1521-3749</identifier><identifier>DOI: 10.1002/zaac.201700024</identifier><language>eng</language><publisher>Weinheim: Wiley Subscription Services, Inc</publisher><subject>Ammonia ; Anions ; Crystal structure ; Europium ; Fluorite ; Lattice vacancies ; Magnetic permeability ; Magnetic properties ; Nitrogen ; Oxide nitride ; Phases ; Pyrochlore‐type structure ; Tantalum ; Tantalum oxides ; X ray powder diffraction</subject><ispartof>Zeitschrift für anorganische und allgemeine Chemie (1950), 2017-12, Vol.643 (23), p.1824-1830</ispartof><rights>2017 WILEY‐VCH Verlag GmbH & Co. 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For phase‐pure samples (X‐ray powder diffraction), the nitrogen content varies between 1.0 and 1.8 wt %, leading to compositions in the range Eu2Ta2O7.1N0.6 – Eu2Ta2O6.5N1.0. Pyrochlore‐type phases are structurally derived from the fluorite type with 1/8 of the anions missing, resulting in an ideal composition A2B2X7. In Eu2Ta2(O,N)7+δ the excess anions partly occupy these vacancies. The prepared phases are colorless with a direct optical bandgap of 4.3 eV and they show the typical Van Vleck paramagnetic behavior known for trivalent Eu atoms.</description><subject>Ammonia</subject><subject>Anions</subject><subject>Crystal structure</subject><subject>Europium</subject><subject>Fluorite</subject><subject>Lattice vacancies</subject><subject>Magnetic permeability</subject><subject>Magnetic properties</subject><subject>Nitrogen</subject><subject>Oxide nitride</subject><subject>Phases</subject><subject>Pyrochlore‐type structure</subject><subject>Tantalum</subject><subject>Tantalum oxides</subject><subject>X ray powder diffraction</subject><issn>0044-2313</issn><issn>1521-3749</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2017</creationdate><recordtype>article</recordtype><sourceid/><recordid>eNo9kE9Kw0AchQdRsFa3rgfcKG3qbyaTTLIsof6Bagutm26GcWZiU2ISZxIkrjyCh_EcHsKTmFLp6vHg4z34EDonMCIA9PpDSjWiQDh0jR2gHgko8XzO4kPUA2DMoz7xj9GJc5sOIRAEPbRatEW9Ni5zQ5zY1tUyx4vaNqpurBliWWj8IF8KU2cKz21ZGVtnxuEyxfPWlmqdl9b8fn4t28rgSUOXkl7Oho9XfPDzfYqOUpk7c_afffR0M1kmd950dnufjKdeRVjEvEBHWilODWeK-ZpICOPUPBsCEYtUykGHhqQ0NFLyGPwwBdDAiWYQRGGUar-PLna7lS3fGuNqsSkbW3SXgsQ8iFnULXVUvKPes9y0orLZq7StICC28sRWntjLE6vxONk3_w_Hq2Xs</recordid><startdate>20171213</startdate><enddate>20171213</enddate><creator>Anke, Björn</creator><creator>Hund, Sophie</creator><creator>Lorent, Christian</creator><creator>Janka, Oliver</creator><creator>Block, Theresa</creator><creator>Pöttgen, Rainer</creator><creator>Lerch, Martin</creator><general>Wiley Subscription Services, Inc</general><scope/></search><sort><creationdate>20171213</creationdate><title>Synthesis, Crystal Structure, and Magnetic Properties of Pyrochlore‐Type Eu2Ta2(O,N)7+δ</title><author>Anke, Björn ; Hund, Sophie ; Lorent, Christian ; Janka, Oliver ; Block, Theresa ; Pöttgen, Rainer ; Lerch, Martin</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-p1484-5d8dcc72e74c43d1a069febe10848cf70d6e1f26eaa79036f00d071d405868fd3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2017</creationdate><topic>Ammonia</topic><topic>Anions</topic><topic>Crystal structure</topic><topic>Europium</topic><topic>Fluorite</topic><topic>Lattice vacancies</topic><topic>Magnetic permeability</topic><topic>Magnetic properties</topic><topic>Nitrogen</topic><topic>Oxide nitride</topic><topic>Phases</topic><topic>Pyrochlore‐type structure</topic><topic>Tantalum</topic><topic>Tantalum oxides</topic><topic>X ray powder diffraction</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Anke, Björn</creatorcontrib><creatorcontrib>Hund, Sophie</creatorcontrib><creatorcontrib>Lorent, Christian</creatorcontrib><creatorcontrib>Janka, Oliver</creatorcontrib><creatorcontrib>Block, Theresa</creatorcontrib><creatorcontrib>Pöttgen, Rainer</creatorcontrib><creatorcontrib>Lerch, Martin</creatorcontrib><jtitle>Zeitschrift für anorganische und allgemeine Chemie (1950)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Anke, Björn</au><au>Hund, Sophie</au><au>Lorent, Christian</au><au>Janka, Oliver</au><au>Block, Theresa</au><au>Pöttgen, Rainer</au><au>Lerch, Martin</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Synthesis, Crystal Structure, and Magnetic Properties of Pyrochlore‐Type Eu2Ta2(O,N)7+δ</atitle><jtitle>Zeitschrift für anorganische und allgemeine Chemie (1950)</jtitle><date>2017-12-13</date><risdate>2017</risdate><volume>643</volume><issue>23</issue><spage>1824</spage><epage>1830</epage><pages>1824-1830</pages><issn>0044-2313</issn><eissn>1521-3749</eissn><abstract>Pyrochlore‐type Eu2Ta2(O,N)7+δ phases were prepared by reaction of ammonia with an amorphous europium tantalum oxide precursor. 151Eu Mössbauer and EPR spectroscopy as well as magnetic susceptibility measurements point to the presence of exclusively Eu3+. For phase‐pure samples (X‐ray powder diffraction), the nitrogen content varies between 1.0 and 1.8 wt %, leading to compositions in the range Eu2Ta2O7.1N0.6 – Eu2Ta2O6.5N1.0. Pyrochlore‐type phases are structurally derived from the fluorite type with 1/8 of the anions missing, resulting in an ideal composition A2B2X7. In Eu2Ta2(O,N)7+δ the excess anions partly occupy these vacancies. The prepared phases are colorless with a direct optical bandgap of 4.3 eV and they show the typical Van Vleck paramagnetic behavior known for trivalent Eu atoms.</abstract><cop>Weinheim</cop><pub>Wiley Subscription Services, Inc</pub><doi>10.1002/zaac.201700024</doi><tpages>7</tpages></addata></record> |
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| source | Wiley Journals |
| subjects | Ammonia Anions Crystal structure Europium Fluorite Lattice vacancies Magnetic permeability Magnetic properties Nitrogen Oxide nitride Phases Pyrochlore‐type structure Tantalum Tantalum oxides X ray powder diffraction |
| title | Synthesis, Crystal Structure, and Magnetic Properties of Pyrochlore‐Type Eu2Ta2(O,N)7+δ |
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