Ferroelectric perovskite-type barium copper niobate: BaCu1/3Nb2/3O3
Ferroelectric perovskite-type barium copper niobate: BaCu1/3Nb2/3O3
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铁电钙钛矿型铌酸铜钡：BaCu1/3Nb2/3O3
DOI：
10.1016/j.jssc.2006.08.008
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发表时间：
2006
影响因子：
3.3
通讯作者：
M. Takano
中科院分区：
文献类型：
--
作者：
W. Zhang;N. Kumada;Y. Yonesaki;T. Takei;N. Kinomura;T. Hayashi;M. Azuma;M. Takano
以BaCO3、CuO和Nb2O5为原料，通过高温反应制备了钙钛矿型BaCu1/3Nb2/3O3。用四方晶胞指标化了该化合物的X-射线粉末衍射谱，其晶胞参数为a=4.0464(4)和c=4.1807(4)？(c/a=1.033)。该化合物具有四方钙钛矿型结构，其中B位被Nb和Cu原子占据。从高温X射线粉末衍射图可以看出，该化合物在500~600℃范围内具有从四方对称到立方对称的相变，P-E和S-E磁滞回线在室温下出现，介电常数随温度变化的表观最大值出现在520℃，磁化率倒数随温度的变化表现为顺磁行为。
A perovskite-type BaCu1/3Nb2/3O3was prepared by high temperature reaction using BaCO3, CuO and Nb2O5. The X-ray powder diffraction pattern of this compound was indexed with the tetragonal cell with the lattice parameters of a=4.0464(4) and c=4.1807(4)Å (c/a=1.033). This compound had the tetragonal perovskite-type structure in which the B site was occupied statistically by Nb and Cu atoms. From high temperature X-ray powder diffraction patterns this compound had a phase transition from the tetragonal to cubic symmetry in the temperature range of 500–600°C. The P–E and S–E hysteresis loops occurred at room temperature and the apparent maximum in the temperature dependence of the dielectric constant was observed at 520°C. The temperature dependence of the inverse of magnetic susceptibility exhibited paramagnetic behavior.