DIELECTRIC AND STRUCTURAL CHARACTERISTICS OF BA-BASED AND SR-BASED COMPLEX PEROVSKITES AS A FUNCTION OF TOLERANCE FACTOR
DIELECTRIC AND STRUCTURAL CHARACTERISTICS OF BA-BASED AND SR-BASED COMPLEX PEROVSKITES AS A FUNCTION OF TOLERANCE FACTOR
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DOI：
10.1143/jjap.33.3984
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发表时间：
1994-07-01
期刊：
影响因子：
--
通讯作者：
SETTER, N
中科院分区：
文献类型：
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作者：
REANEY, IM;COLLA, EL;SETTER, N
非铁电复合钙钛矿陶瓷的介电常数温度系数（τ（τ））对于这类陶瓷在微波滤波器和谐振器中的应用具有重要意义。 最近的工作已经将复杂钙钛矿的τ（τ）的变化与涉及八面体倾斜的结构相变的开始直接相关。 可以认为，八面体倾斜的开始是由公差因子（t）控制的。 因此，τ（τ）和t之间的关系被假定。 这种关系进行了讨论，透射电子显微镜是用来证明的结构修改，导致异常的tau（τ）在给定值的t的例子。
The temperature coefficient of the dielectric permittivity (tau(epsilon)) of nonferroelectric complex perovskites is of importance in the application of these cermaics to microwave filters and resonators. Recent work has directly related changes in the tau(epsilon) of complex perovskites to the onset of structural phase transitions which involve tilting of the octahedra. It can be argued that the onset of octahedral tilting is controlled by the tolerance factor (t). Thus, a relationship between tau(epsilon) and t is postulated. This relationship is discussed and transmission electron microscopy is used to demonstrate examples of the structural modifications which cause the anomalies in tau(epsilon) at given values of t.