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首页> 外文期刊>Russian journal of electrochemistry >Phase equilibriums, oxygen exchange kinetics and diffusion in oxides CaZr_1-xSc_xO_(3-x/2-δ)
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Phase equilibriums, oxygen exchange kinetics and diffusion in oxides CaZr_1-xSc_xO_(3-x/2-δ)

机译:相平衡,氧交换动力学和氧化物中的扩散CaZr_1-xSc_xO_(3-x /2-δ)

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摘要

Oxides CaZr_(1 - x)Sc_xO_(3 - x/2 - δ)(x = 0.00-0.20) were synthesized according to the ceramic tech- nology. The solubility boundary of scandium with formation of solid solutions on the basis of calcium zircon- ate CaZrO_(3 - δ)orresponds to x = 0.07-0.08. The second phase of CaSc_2O_4 is present in the samples with scandium content of x = 0.10, 0.15, 0.20. Its fraction grows at an increase in x. The method of full-profile Rietveld analysis was used to calculate the structure parameters for oxides CaZr_(0.99)Sc_(0.01)O_(2.995 - δ) and CaZr_(0.95)Sc_(0.05)O_(2.975 - δ). The method of isotopic exchange with gas phase analysis was used to study the kinet- ics of gas-phase oxygen interaction with the CaZr 0.95Sc 0.05O 2.975 - δ oxide in the temperature range of 700- 850°C and at oxygen pressures of 0.13-6.67 kPa. The values of effective activation energies of the oxygen exchange and diffusion processes were 1.36 ± 0.32 and 1.92 ± 0.21 eV, accordingly. The dependence of the interphase exchange rate on the pressure of oxygen corresponds to the power law with the exponent of 0.31 ± 0.04 at the temperature of 750°C.
机译:根据陶瓷技术合成了氧化物CaZr_(1-x)Sc_xO_(3-x / 2-δ)(x = 0.00-0.20)。在锆酸钙CaZrO_(3-δ)的基础上形成固溶体的dium的溶解度边界等于x = 0.07-0.08。 CaSc_2O_4的第二相存在于样品中,scan含量为x = 0.10、0.15、0.20。它的分数随着x的增加而增长。采用全截面Rietveld分析方法计算了氧化物CaZr_(0.99)Sc_(0.01)O_(2.995-δ)和CaZr_(0.95)Sc_(0.05)O_(2.975-δ)的结构参数。同位素分析和气相色谱分析方法用于研究在700-850°C的温度范围和0.13的氧气压力下CaZr 0.95Sc 0.05O 2.975-δ氧化物与气相氧相互作用的动力学。 -6.67 kPa。氧交换和扩散过程的有效活化能值分别为1.36±0.32和1.92±0.21 eV。相间交换速率对氧气压力的依赖性对应于幂律,在750°C温度下的指数为0.31±0.04。

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