The influence of mole fraction and nature of the cations in positions [8]A and [6]B of the pyrochlores containing Na+, Ca2+, Cd2+, U4+, Nb5+, Ta5+, Ti4+, Sb5+, Zr4+, V3+, V4+, W5+, W6+ synthesized under hydrothermal conditions at 800 °C, 200 MPa and controlled oxygen fugacity in NaF solution of 1.0 mol·kg−1 H2O on lattice parameters has been considered. The unit cell parameters of the fluorpyrochlores where for Nb5+ or Ta5+ were substituted by other cations showing distinct linear variations from the effective cations radii in positions [8]A and [6]B. Based on the literary data analysis, the two-parameter nonlinear equation describing dependence of pyrochlore lattice parameters on the cation radii for the oxide-pyrochlores has been proposed.

中文翻译：

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烧绿石稳定性的结构方面：[8]A、[6]B 位置中阳离子和晶格参数的影响

含Na+、Ca2+、Cd2+、U4+、Nb5+、Ta5+、Ti4+、Sb5+、Zr4+、V3+、V4+、W5+、W6+的烧绿石中[8]A和[6]B位阳离子的摩尔分数和性质的影响已考虑在 800 °C、200 MPa 和控制氧逸度的 1.0 mol·kg-1 H2O NaF 溶液中对晶格参数进行水热条件下合成。氟绿石的晶胞参数，其中 Nb5+ 或 Ta5+ 被其他阳离子取代，显示出与位置 [8]A 和 [6]B 中有效阳离子半径的明显线性变化。在文献资料分析的基础上，提出了描述烧绿石晶格参数对氧化物烧绿石阳离子半径依赖性的二参数非线性方程。