Thermophysical Properties of Perovskite-Type Strontium Cerate and Zirconate
Thermophysical Properties of Perovskite-Type Strontium Cerate and Zirconate
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DOI：
10.1111/j.1551-2916.2005.00278.x
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发表时间：
2005-06
影响因子：
3.9
通讯作者：
S. Yamanaka;K. Kurosaki;T. Oyama;H. Muta;M. Uno;T. Matsuda;Shin-ichi Kobayashi
中科院分区：
文献类型：
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作者：
S. Yamanaka;K. Kurosaki;T. Oyama;H. Muta;M. Uno;T. Matsuda;Shin-ichi Kobayashi
制备了锶系钙钛矿型氧化物SrCeO_3和SrZrO_3的多晶样品，并测试了它们的热物理性质。样品的化学成分没有偏离化学计量成分。氧金属比(O/M)分别为3.00±0.03和2.98±0.01。在300~1000K温度范围内，平均线膨胀系数分别为1.11×10−5K−1和9.69×10−6K−1，熔化温度Tm分别为2266K和2883K。利用超声脉冲回波法在室温空气中测量了材料的纵向声速和剪切声速，以求取材料的弹性模数和德拜温度。用差示扫描量热仪在高纯Ar气氛中测量了其热容。在真空中用激光闪光法测量了其热扩散率。样品的室温导热系数分别为2.95W·m−1·K−1和4.06W·m Pb1·K。
Polycrystalline samples of strontium series perovskite-type oxides, SrCeO3 and SrZrO3, were prepared and the thermophysical properties were measured. The chemical compositions of the samples do not deviate from the stoichiometric composition. The oxygen-to-metal (O/M) ratios of SrCeO3 and SrZrO3 are 3.00±0.03 and 2.98±0.01, respectively. The average linear thermal expansion coefficients are 1.11 × 10−5 K−1 for SrCeO3 and 9.69 × 10−6 K−1 for SrZrO3 in the temperature range between 300 and 1000 K. The melting temperatures Tm of SrCeO3 and SrZrO3 are 2266 and 2883 K, respectively. The longitudinal and shear sound velocities were measured by an ultrasonic pulse–echo method at room temperature in air, which enables to evaluate the elastic moduli and Debye temperature. The heat capacity was measured by using a differential scanning calorimeter in high-purity argon atmosphere. The thermal diffusivity was measured by a laser flash method in vacuum. The thermal conductivities of SrCeO3 and SrZrO3 at room temperature are 2.95 and 4.06 W·m−1·K−1, respectively.