Determining the phase stability of luminescent materials based on the solid solutions of oxyorthosilicates (Lu1−xLnx)[(SiO4)0.5O0.5], where Ln = La−Yb
| Autor: | E. I. Get’man, S. V. Radio, Lyudmyla I. Ardanova, Yu. A. Oleksii |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Dopant Thermal decomposition Analytical chemistry chemistry.chemical_element 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Lutetium chemistry Isomorphous substitution 0103 physical sciences Activator (phosphor) Chemical stability 0210 nano-technology Luminescence Solid solution |
| Zdroj: | Fine Chemical Technologies. 15:54-62 |
| ISSN: | 2686-7575 2410-6593 |
| DOI: | 10.32362/2410-6593-2020-15-5-54-62 |
| Popis: | Objectives. This study aimed to predict the limits of substitution and stability of luminescent materials based on low-temperature modifications of solid solutions (spatial group P21/c) with lutetium oxyorthosilicates (Lu1−xLnx)[(SiO4)0.5O0.5], where Ln represents the rare-earth elements (REEs) of the La–Yb series.Methods. The V.S. Urusov’s crystal energy theory of isomorphous substitutions and a crystallochemical approach in the regular solid solution approximation were used to calculate the energies of the mixing (interaction parameters) of the solid solutions.Results. Using the V.S. Urusov’s theory, we calculated the energies of mixing (interaction parameters) in the systems under study. The dependences of the decomposition temperatures of solid solutions on the REE number and composition (x) were obtained and used to create a diagram of the thermodynamic stability of the solid solutions, allowing us to predict the substitution limits depending on the temperature or determine the decomposition temperature using the given substitution limits.Conclusions. The results of the study can be useful when choosing the ratio of components in matrices (host materials) and the amount of the activator (dopant) in the new luminescent, laser, and other materials based on low-temperature modifications of solid solutions of “mixed” REE oxyorthosilicates (Lu1−xLnx)[(SiO4)0.5O0.5]. |
| Databáze: | OpenAIRE |
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