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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Conductivity, structure, and thermodynamics of Y2Ti2O7-Y3NbO7 solid solutions
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Conductivity, structure, and thermodynamics of Y2Ti2O7-Y3NbO7 solid solutions

机译：Y2Ti2O7-Y3NBO7固溶体的电导率，结构和热力学

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摘要

The defect fluorite yttrium niobate Y3NbO7 and pyrochlore yttrium titanate Y2Ti2O7 solid solutions have been synthesized via a solid state synthesis route. The resulting stoichiometry of the oxides is Y2+xTi2-2xNbxO7, where x = 0 to x = 1. All of the samples were single-phase; however, for those with a predominant fluorite phase, a small amount of additional pyrochlore phase was detected. The volume of the solid solution unit cells linearly increases with increase in yttrium niobate content. The water uptake increases with (x) and the protonic defect concentration reaches almost 4.5 x 10(-3) mol mol(-1) at 300 degrees C. The calculated enthalpy of formation from oxides suggests strong stability for all of the compositions, with the values of enthalpy ranging from -84.6 to -114.3 kJ mol(-1). The total conductivity does not have a visible dependence on Y3NbO7 content. For each compound, the total conductivity is higher in wet air. Interestingly, for samples where x < 0.5, the ratio of conductivity in hydrogen to air increases with increasing temperature, while for x > 0.5, the trend is the opposite.
机译：已经通过固态合成途径合成了缺陷萤石钇铌酸盐Y3NBO7和吡喃葡萄酒钛酸钇Y2Ti2O7固溶体。氧化物的所得化学计量是Y2 + XTI2-2XNBXO7，其中x = 0至x = 1.所有样品是单相;然而，对于具有主要萤石相的那些，检测少量的另外的烧焦相。随着钇铌酸盐含量的增加，固溶体单元细胞的体积随着铌酸盐含量的增加而增加。用（x）的水吸收增加，质子缺陷浓度在300℃下达到4.5×10（-3）摩尔摩（-1）。从氧化物的形成焓表明所有组合物的强稳定性从-84.6至-114.3 kJ mol（-1）的焓范围的值。总电导率没有对Y3NBO7含量的可见依赖性。对于每个化合物，湿空气中的总电导率较高。有趣的是，对于X <0.5的样品，氢气中的电导率与空气的比率随温度的增加而增加，而对于X> 0.5，趋势是相反的。

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