Synthesis, Crystal and Thermal Properties of Solid Solution Zn2−2xCu2xSiO4 with Willemite Structure
| Autor: | N. A. Zaitseva, I. V. Ivanova, Rina F. Samigullina, M. V. Rotermel, T. I. Krasnenko |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Dopant Annealing (metallurgy) Materials Science (miscellaneous) Willemite Analytical chemistry engineering.material 010402 general chemistry 010403 inorganic & nuclear chemistry 01 natural sciences 0104 chemical sciences Inorganic Chemistry Volume expansion Homogeneity (physics) Thermal engineering Melting point Physical and Theoretical Chemistry Solid solution |
| Zdroj: | Russian Journal of Inorganic Chemistry. 64:1-6 |
| ISSN: | 1531-8613 0036-0236 |
| Popis: | Solid solution Zn2−2xCu2xSiO4 with the willemite structure has been synthesized by the proposed solid-phase synthesis procedure. It is shown that the maximum annealing temperature is 1030 ± 1°C because of the decomposition of CuO. The extent of the Zn2−2xCu2xSiO4 solid solution is 7.5 at % Cu. The unit cell crystal-chemical parameters and coefficients of thermal linear and volume expansion are independent of the Cu2+ concentration. Melting points of Zn2−2xCu2xSiO4 samples in the homogeneity region are also independent of the dopant index x and close to the values found for undoped Zn2SiO4 (1512 ± 1°C). The deformation phase transition in Zn2SiO4 and Zn2−2xCu2xSiO4 is found for the first time being 10 ± 2°C below the melting point. The combination of the obtained crystal-chemical and thermal data allowed us to carry out the triangulation of the diagram of the ZnO−SiO2−CuO system to divide it into five secondary triangles by two-phase equilibria lines. |
| Databáze: | OpenAIRE |
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