Effect of La Content on the Thermal Volume Change of Ba4.22Na1.44Nb10.12O30.24-Ba3NaLaNb10O30 Solid Solutions at Ferroelectric Transition Temperature
Effect of La Content on the Thermal Volume Change of Ba4.22Na1.44Nb10.12O30.24-Ba3NaLaNb10O30 Solid Solutions at Ferroelectric Transition Temperature
复制标题
La含量对Ba4.22Na1.44Nb10.12O30.24-Ba3NaLaNb10O30固溶体铁电转变温度热体积变化的影响
DOI：
10.1143/jjap.29.2435
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发表时间：
1990
影响因子：
1.5
通讯作者：
S. Tsutsumi
中科院分区：
文献类型：
--
作者：
M. Shimazu;Hirokazu Shinya;S. Kuroiwa;M. Tsukioka;S. Tsutsumi
合成了Ba4.22Na1.44Nb10.12O30.24 (BNN-B)-Ba3NaLaNb10O30 （BNLN）体系的烧结固溶体，并用x射线粉末衍射和差示扫描量热仪（DSC）分析对其进行了表征。BNN(-B)-BNLN体系在整个范围内具有连续的固溶体，具有准四方对称的钨青铜型结构。室温下，随着La含量的增加，a轴略有增加，而c轴明显减小。轴对温度的依赖是c轴的特征。铁电转变温度下c轴的热收缩随La含量的增加而减小，在中间组分中，c轴的热收缩几乎为零。DSC分析表明，随着La含量的增加，转变焓（ΔHt）和转变温度（Tt）均降低。
Sintered solid solutions in the Ba4.22Na1.44Nb10.12O30.24 (BNN-B)-Ba3NaLaNb10O30 (BNLN) system have been synthesized and examined by X-ray powder diffraction and differential scanning calorimeter (DSC) analysis. The BNN(-B)-BNLN system has continuous solid solutions over the whole range, which have a tungsten bronze type of structure with pseudotetragonal symmetry. At room temperature, the a-axis increases slightly with increasing La content while the c-axis markedly decreases. The temperature dependence of the axes is characteristic in the c-axis. The thermal contraction of the c-axis occurring at the ferroelectric transition temperature is depressed with increasing La content, and in an intermediate composition, the contraction is reduced to nearly zero. The DSC analysis showed that both the transition enthalpy (ΔHt) and the transition temperature (Tt) decrease with increasing La content.