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首页> 外文期刊>Journal of Physics. Condensed Matter >Thermoelectric properties of LaRh_(1-x) Ni_x O_3
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Thermoelectric properties of LaRh_(1-x) Ni_x O_3

机译:LaRh_(1-x)Ni_x O_3的热电性能

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摘要

We report measurements and analyses of resistivity, thermopower and thermal conductivity of polycrystalline samples of perovskite LaRh_(1-r)Ni_x0_3. The thermopower is found to be large at 800 K (185 μV K~(-1) for x = 0.3), which is ascribed to the high-temperature stability of the low-spin state of Rh~(3+)/Rh~(4+) ions. This clearly contrasts with the thermopower of the isostructural oxide LaCo0_3, which rapidly decreases above 500 K owing to the spin-state transition. The spin state of the transition-metal ions is one of the most important parameters in oxide thermoelectrics.
机译:我们报告钙钛矿型LaRh_(1-r)Ni_x0_3的多晶样品的电阻率,热功率和热导率的测量和分析。发现热功率在800 K时很大(x = 0.3时为185μVK〜(-1)),这归因于Rh〜(3 +)/ Rh〜的低自旋态的高温稳定性。 (4+)个离子。这显然与同构氧化物LaCo0_3的热功率形成对比,后者由于自旋态跃迁而迅速降低至500 K以上。过渡金属离子的自旋态是氧化物热电学中最重要的参数之一。

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