Physicochemical and Transport Properties of Bicuvox-Based Ceramics
Physicochemical and Transport Properties of Bicuvox-Based Ceramics
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Bicuvox 基陶瓷的物理化学和传输性能
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
F. Marques
中科院分区：
文献类型：
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作者：
A. Yaremchenko;V. Kharton;E. N. Naumovich;F. Marques
采用标准陶瓷合成技术制备了Bi 2-xLaxV 0.90Cu 0.10O 5.5-α（x = 0，0.10和0.20）和Bi 1.90Pr 0.10V 0.90Cu 0.10O 5.5-α多晶。Bi1.90La0.10V0.90Cu0.10O5.5-α固溶体在500 K以上的电导率低于未掺杂的BICUVOX.10，而这些材料在370-450 K的输运性质彼此接近。研究发现，在Bi_2 V_（0.90）Cu_（0.10）O_（5.5-α）中掺入镨，可使第二相偏析，降低陶瓷的电导率和热膨胀系数。在780-910 K范围内，中等稀土掺杂量（x ≤ 0.10）的氧化物的氧离子迁移数在0.90-0.99之间，随温度的升高而降低。根据膨胀测量数据计算出Bi 2-xLnxV0.90Cu0.10O5.5-α陶瓷在730-1050 K时的热膨胀系数为（16.1-18.0）× 10- 6 K-1。
Polycrystalline Bi2-xLaxV0.90Cu0.10O5.5-α (x = 0, 0.10 and 0.20) and Bi1.90Pr0.10V0.90Cu0.10O5.5-α were prepared by the standard ceramic synthesis technique. Electrical conductivity of the Bi1.90La0.10V0.90Cu0.10O5.5-α solid solution at temperatures above 500 K is lower in comparison with undoped BICUVOX.10, whereas transport properties of these materials at 370–450 K are close to each other. Doping Bi2V0.90Cu0.10O5.5-α with praseodymium was found to result in segregating secondary phases and decreasing conductivity and thermal expansion of the ceramics. Oxygen ion transference numbers of the oxides with moderate rare-earth dopant content (x ≤ 0.10) vary in the range of 0.90–0.99 at 780–910 K, decreasing with increasing temperature. Thermal expansion coefficients of Bi2-xLnxV0.90Cu0.10O5.5-α ceramics were calculated from the dilatometric data to be (16.1–18.0) × 10-6K-1 at 730–1050 K.