Abstract

The feasibility of synthesizing gadolinium tantalum niobates by the liquid-phase method was demonstrated. The methods of X-ray diffraction, electron probe microanalysis, local cathodoluminescence, and photoluminescence were applied to study the samples. It was shown that under the selected synthesis conditions (T ~ 1400°C for 3 hours), no solid solution of niobium-tantalum was formed in the powder samples. When obtaining ceramic samples, it was possible to obtain a solid solution and to study the dependence of the luminescence intensity on the niobium content upon excitation of the samples by an electron beam. The maximum luminescence intensity was observed in the sample with the composition of GdNb_0.9Ta_0.1O₄. It was shown that the inhomogeneity of luminescence is not related to fluctuations in composition, but is related to the inhomogeneous distribution of vacancy centers, which are luminescence centers.

中文翻译：

---

铌酸钽钽Gd（Nb x Ta 1 – x）O 4的合成及发光性能

摘要

证明了液相法合成铌酸钽t的可行性。采用X射线衍射，电子探针显微分析，局部阴极发光和光致发光的方法研究样品。结果表明，所选择的合成条件下（Ť〜1400℃进行3小时），在粉末样品中形成的铌钽的无固体的溶液。当获得陶瓷样品时，有可能获得固溶体并研究电子束激发样品时发光强度对铌含量的依赖性。在组成为GdNb _0.9 Ta _0.1 O ₄的样品中观察到最大发光强度。结果表明，发光的不均匀性与组成的波动无关，而与作为发光中心的空位中心的不均匀分布有关。