The concentration series of sodium‐gadolinium molybdate (NGM) crystals have been grown by Czochralski technique from stoichiometric Na_0,5Gd_0,5MoO₄ melt, and from seven different nonstoichiometric melts in various atmospheres. The actual cation compositions of the crystals are measured by microprobe analysis. The location of the congruently melting composition is found for this compound, and the homogeneity field is evaluated. The unit cell parameters of the crystals have been calculated from X‐ray diffraction (XRD) analysis results. Hydrostatic densities of the crystals are measured. Based on these results, the actual molar weights of the samples are calculated that allows more precise determination of the crystals compositions. The studied crystals are shown to contain substantial sodium deficiency and excess of gadolinium compared to stoichiometry. The amount of cation vacancies occurs in both sublattices along with increase of Gd₂O₃/Na₂O molar ratio in the crystals.

中文翻译：

---

阳离子不足的钼酸钠G钼酸单晶的生长及其实际组成

钼酸ga钠（NGM）晶体的浓度系列是通过直拉法从化学计量的Na _0.5 Gd _0.5 MoO ₄生长的熔体，并在不同的气氛中来自七个不同的非化学计量熔体。通过微探针分析测量晶体的实际阳离子组成。找到该化合物的完全熔化的组合物的位置，并评估均匀性场。晶体的晶胞参数是根据X射线衍射（XRD）分析结果计算得出的。测量晶体的静水密度。基于这些结果，计算出样品的实际摩尔质量，从而可以更精确地确定晶体组成。与化学计量相比，研究的晶体显示含有大量的钠缺乏和excess。随着Gd ₂ O _3的增加，两个亚晶格中都会出现阳离子空位的数量。/ Na ₂ O在晶体中的摩尔比。