Heat Capacity and Thermodynamic Functions of Sr(La1-xLnx)2WO7 Compounds Doped with Samarium and Europium

IF 0.5 Q4 CHEMISTRY, MULTIDISCIPLINARY

Eurasian Chemico-Technological Journal Pub Date : 2021-03-25 DOI:10.18321/ECTJ1031

D. Sadyrbekov, M. Bissengaliyeva, D. B. Gogol, N. Bekturganov, Shynar T. Taimassova

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Abstract

Samples based on strontium, lanthanum and tungsten with the general formula of Sr(La1-xLnx)2WO7 doped with samarium and europium at 1 and 3 at.% were synthesized by the solid-phase method at temperatures up to 1200 °C. The crystal structure of the samples was confirmed by X-ray powder diffraction. A full-profile refinement of the structure of compounds related to monoclinic syngony with the space group P1121/b was performed. The admixture phase is a compound of the Sr3Ln2W2O12 type with a trigonal system and space group R3-C. Based on the results of structure refinement, the ratio of the main compound and the admixture phase in the samples was determined to introduce corrections during measurements. Using adiabatic calorimetry we measured the heat capacity of the samples and found the thermodynamic functions of main compounds over the range of 5‒320 K. Anomalies were detected in the heat capacity of the samples below 15 K, and we calculated the excess and lattice heat capacity for these anomalies by means of linearization methods.

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钐和铕掺杂Sr（La1-xLnx）2WO7化合物的热容和热力学函数

在高达1200°C的温度下，通过固相法合成了基于锶、镧和钨的样品，其通式为Sr（La1-xLnx）2WO7，掺杂有1和3 at.%的钐和铕。通过X射线粉末衍射证实了样品的晶体结构。对与空间群为P1121/b的单斜合成气有关的化合物的结构进行了全面的细化。混合相是具有三角体系和空间基团R3-C的Sr3Ln2W2O12型化合物。基于结构细化的结果，确定了样品中主要化合物和混合相的比例，以在测量过程中引入校正。使用绝热量热法，我们测量了样品的热容，并发现主要化合物在5-320K范围内的热力学函数。在低于15K的样品的热容中检测到异常，我们通过线性化方法计算了这些异常的过剩热容和晶格热容。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Eurasian Chemico-Technological Journal CHEMISTRY, MULTIDISCIPLINARY-

CiteScore

1.10

自引率

20.00%

发文量

审稿时长

20 weeks

期刊介绍： The journal is designed for publication of experimental and theoretical investigation results in the field of chemistry and chemical technology. Among priority fields that emphasized by chemical science are as follows: advanced materials and chemical technologies, current issues of organic synthesis and chemistry of natural compounds, physical chemistry, chemical physics, electro-photo-radiative-plasma chemistry, colloids, nanotechnologies, catalysis and surface-active materials, polymers, biochemistry.