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The effects of the modification of the BST-system solid solutions with rare earth elements
Ceramics International ( IF 5.2 ) Pub Date : 2021-09-25 , DOI: 10.1016/j.ceramint.2021.09.243
K.P. Andryushin 1 , L.A. Shilkina 1 , S.V. Khasbulatov 2 , A.V. Nagaenko 3 , S.I. Dudkina 1 , I.N. Andryushina 1 , KhA. Sadykov 4 , I.A. Verbenko 1 , A.G. Rudskaya 5 , L.A. Reznichenko 1
Affiliation  

The conditions for the preparation of the solid solutions of a binary system of barium-strontium titanates with the substitutions in the A-sublattice with the rare-earth elements (REE), including the solid-phase synthesis, mechanical activation and sintering of dispersed-crystalline products by the conventional ceramic technology, were optimized. The presence (absence) of the impurity phases was established depending on the size effect of the REE. The precision X-ray diffraction analysis revealed the features of the phase formation in the studied solid solutions and showed that the “behavior” of the structural characteristics of the solid solutions with the participation of the REE is determined by the limiting conditions of the isomorphism and anion excess of the media under study. An assumption is made about the nature of the formation of a fine-grained landscape of the modified solid solutions, associated with the multicluster structure of the crystallite structure and the formation of the ballast phases during their synthesis. The dependences of the dielectric properties of the solid-state solution on the external influences – temperature, frequency of an alternating electric field and strength of a constant field – have been established. The possibility of choosing on the basis of the obtained data, promising for practical applications of the compositions is shown.



中文翻译:

稀土元素对BST体系固溶体的改性作用

A中取代的钛酸钡锶二元体系固溶体的制备条件- 稀土元素(REE)的亚晶格,包括传统陶瓷技术的固相合成、机械活化和分散结晶产品的烧结,得到了优化。杂质相的存在(不存在)取决于 REE 的尺寸效应。精密X射线衍射分析揭示了所研究固溶体中的相形成特征,表明在稀土元素的参与下固溶体结构特征的“行为”是由同构的限制条件决定的。所研究介质的阴离子过量。对改性固溶体的细粒度景观形成的性质进行了假设,与微晶结构的多簇结构和它们合成过程中压载相的形成有关。固态溶液的介电特性对外部影响(温度、交变电场频率和恒定场强度)的依赖性已经确定。显示了根据获得的数据进行选择的可能性,显示了该组合物的实际应用前景。

更新日期:2021-11-30
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