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首页> 外文期刊>Crystal growth & design >Growth and Characterization of Pure Gd-Heptamolybdate and Mixed Gd-Ba-Molybdate Crystals
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Growth and Characterization of Pure Gd-Heptamolybdate and Mixed Gd-Ba-Molybdate Crystals

机译:纯Gd-七钼酸盐和混合的Gd-Ba-钼酸盐晶体的生长和表征

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摘要

The growth of pure Gd- and mixed Gd-Ba-molybdate crystals, bearing the stoichiometric composition Gd_2Mo_7O_(24)·xH_2O and Gd_2Ba_(24)Mo_(42)O_(153), is achieved by the gel technique, using the system RCl_3-(NH_4)_6Mo_7O_(24)-NH_4NO_3-HNO_3-Na_2SiO_3 (where R = Gd, Gd:Ba). Addition of Ba in the lattice of pure Gd-heptamolybdate influences the morphological developments of grown crystals. While pure Gd-heptamolybdate assumes a spherulitic morphology under all conditions of growth, the addition of Ba modifies the morphology of mixed crystals drastically and develops them as well-faceted pyramidal twinned crystals. The mixed crystals do not carry any water of hydration and are thermally more stable as compared to pure Gd-heptamolybdate carrying water of hydration.
机译:使用RCl_3系统,通过凝胶技术实现了具有化学计量组成Gd_2Mo_7O_(24)·xH_2O和Gd_2Ba_(24)Mo_(42)O_(153)的纯Gd-和混合Gd-Ba-钼酸盐晶体的生长。 -(NH_4)_6Mo_7O_(24)-NH_4NO_3-HNO_3-Na_2SiO_3(其中R = Gd,Gd:Ba)。在纯Gd-七钼酸盐的晶格中添加Ba影响生长晶体的形态发展。虽然纯Gd-庚钼酸盐在所有生长条件下均呈球状形态,但Ba的添加会极大地改变混合晶体的形态,并将其发展为面状良好的金字塔形孪晶。混合的晶体不携带任何水合水,并且与携带水合水的纯Gd-七钼酸盐相比在热方面更稳定。

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