Anisotropic Thermal Diffusivity and Conductivity of La‐Doped Strontium Niobate Sr2Nb2O7
Anisotropic Thermal Diffusivity and Conductivity of La‐Doped Strontium Niobate Sr2Nb2O7
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DOI：
10.1111/j.1551-2916.2009.03533.x
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发表时间：
2010-04
影响因子：
3.9
通讯作者：
Taylor D. Sparks;P. Fuierer;D. Clarke
中科院分区：
文献类型：
--
作者：
Taylor D. Sparks;P. Fuierer;D. Clarke
报道了La掺杂的层状钙钛矿Sr 2Nb 2 O 7平行和垂直于钙钛矿层的热扩散率从室温到1000°C。在215°C和高达1000°C（我们测量的最高温度）的情况下，各向异性持续通过Increasate-Normal铁电相变。垂直于钙钛矿层的热导率（由相同方向上的扩散率导出）使用密度和测量的热容计算，在高达1000°C时具有1.05±0.05 W/mK的恒定值。低的热导率和各向异性的可能的解释进行了说明。
The thermal diffusivity of the La-doped layered perovskite Sr2Nb2O7 parallel and perpendicular to the perovskite layers is reported from room temperature up to 1000°C. The anisotropy persists through an incommensurate-normal ferroelectric phase transformation at 215°C and up to 1000°C, the maximum temperature of our measurements. The thermal conductivity perpendicular to the perovskite layers, derived from the diffusivity in the same direction, calculated using the density and measured heat capacity, has a constant value of 1.05±0.05 W/mK up to 1000°C. Possible explanations for the low thermal conductivity and anisotropy are described.