Ferroelectricity and solid-solution structure of KNbO3 ceramics doped with La and Fe
Ferroelectricity and solid-solution structure of KNbO3 ceramics doped with La and Fe
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DOI：
10.4028/www.scientific.net/kem.269.7
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发表时间：
2004-01-01
期刊：
影响因子：
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通讯作者：
Ohsato, H
中科院分区：
文献类型：
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作者：
Kakimoto, K;Masuda, I;Ohsato, H
必须发现，La2O3 和 Fe2O3 的共掺杂可以作为通过普通无压烧结工艺实现 KNbO3 陶瓷致密化的添加剂。 X射线衍射分析表明，共掺杂的KNbO3形成单一的(K1-xLax)(Nb1-xFex)O-3固溶体，并且当x为0.020时，晶系由斜方晶系转变为四方晶系，当x大于或等于0.200时，晶系由四方晶系转变为立方晶系。 Fe k边的X射线吸收近边结构（XANES）表明，x=0.004的样品中可能发生Fe的价态变化。 2 x=0.002 样品表现出良好饱和的 P-E 磁滞回线，P-r 为 18 muC/cm(2)，E-c 为 9 kV/cm，压电测量中 k(p) 为 0.17，k(i) 为 0.47，d(33) 为 98 pC/N。
Co-doping of La2O3 and Fe2O3, has to be found to work effectively as an additive for densification of KNbO3 ceramics through ordinary pressure-less sintering process. X-ray diffraction analysis revealed that the co-doped KNbO3 formed a single (K1-xLax)(Nb1-xFex)O-3 solid solution and changed in the crystal system from orthorhombic to tetragonal at x of 0.020, and from tetragonal to cubic at x greater than or equal to 0.200. X-ray absorption near edge structure (XANES) of Fe k-edge revealed that valence change of Fe might occur in the specimen with x=0.004. 2 The x=0.002 specimen demonstrated a well-saturated P-E hysteresis loop with P-r of 18 muC/cm(2) and E-c of 9 kV/cm, and showed k(p) of 0.17, k(i) of 0.47 and d(33) of 98 pC/N in the piezoelectric measurement.