New solid solutions of LixNa1–xKZnP2O7 belonging to the MM'ZnP2O7 structural family (M = Li+, Na+, Zn2+; M’ = Na+, K+), were prepared and phase equilibria along the LiKZnP2O7–NaKZnP2O7 section were reported. These solid solutions were investigated single-crystal X-ray diffraction, high-temperature X-ray powder diffraction (HTXRD), differential scanning calorimetry, and impedance spectroscopy. A miscibility gap was found within the range of 0.8 < x < 1.0, and a binodal curve was constructed using HTXRD data. The similarity of the thermal and compositional deformation of LixNa1–xKZnP2O7 solid solutions is revealed: increasing the radius of the metal by 0.01 Å leads to the same deformations of the crystal structure as increasing the temperature by 31 °C. The Li/Na↔Zn cation exchange lead to an increase in conductivity above 300 °C. The alkali mixed effect in activation energy occurs for LixNa1–xKZnP2O7 solid solutions near x = 0.5. The phase with the 2a×2b×c superstructure ordering was observed as a result of the solid solution melting.
Предметные области Scopus
- Электроника, оптика и магнитные материалы
- Керамика и композитные материалы
- Физика конденсатов
- Физическая и теоретическая химия
- Неорганическая химия
- Химия материалов