非化学计量氮化氧EuTaO1.75N1.25的快速合成、结构和磁性能

IF 1.3 4区材料科学 Q3 MATERIALS SCIENCE, CERAMICS

Advances in Applied Ceramics Pub Date : 2020-12-14 DOI:10.1080/17436753.2020.1858011

Shiya Ye, Duan Li, Liang Zeng, Jun-sheng Li, F. Cao

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引用次数: 0

摘要

采用尿素路线结合改进的无压放电等离子烧结装置，在不到10 min的时间内合成了EuTaO1.75N1.25的非化学计量氮化氧。用第一性原理计算研究了EuTaO1.75N1.25的电子性质。x射线粉末衍射结果表明，EuTaO1.75N1.25结晶为立方钙钛矿型结构S.G.，晶格常数a = 4.0283(7) Å。热重研究表明，EuTaO1.75 N1.25在含氧环境下的分解温度约为345℃，最终分解产物为EuTaO4和Eu5Ta4O15氧化物。磁化率测试表明EuTaO1.75 N1.25具有顺磁性，估计温度c =9.9 K。饱和矩为6.82 μB，小于Eu2+的预期值7 μB，这可能是由于Eu3+的存在。剩余物和矫顽力场的极小值符合与Eu2+相关的8S7/2基态的各向同性特征。

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Rapid synthesis, structure, and magnetic properties of the non-stoichiometric oxynitride EuTaO1.75N1.25

ABSTRACT Non-stoichiometric oxynitride with a composition of EuTaO1.75N1.25 was synthesized in <10 min through urea route combined with modified pressureless spark plasma sintering apparatus. The electronic properties of EuTaO1.75N1.25 was investigated by first-principles calculations. X-ray powder diffraction revealed that EuTaO1.75N1.25 crystallized with the cubic perovskite-type structure, S.G. , and a lattice constant of a = 4.0283(7) Å. Thermogravimetric studies revealed that EuTaO1.75 N1.25 decomposed at around 345 under the oxygen atmosphere, giving a final product of decomposition as EuTaO4 and Eu5Ta4O15 oxides. Magnetic susceptibility measurements indicated EuTaO1.75 N1.25's paramagnetic behavior with an estimated T c =9.9 K. The saturation moment of 6.82 μB which is smaller than 7 μB expected for Eu2+ can be due to the existence of Eu3+. The extremely low value obtained for remanence and coercive field agrees to the isotropic character of the 8S7/2 ground state associated to the Eu2+.

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来源期刊

Advances in Applied Ceramics 工程技术-材料科学：硅酸盐

CiteScore

4.40

自引率

4.50%

发文量

审稿时长

5.2 months

期刊介绍： Advances in Applied Ceramics: Structural, Functional and Bioceramics provides international coverage of high-quality research on functional ceramics, engineering ceramics and bioceramics.