Phase Transitions and Dielectric Properties of Modified BSPT Ceramicsстатья
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Дата последнего поиска статьи во внешних источниках: 5 декабря 2015 г.
Аннотация:Influence of complex NaCl/KCl and CaCl2/KCl additives (with molar ratios 1:1 and 0.75:0.25, respectively) with low melting temperatures on structure, dielectric and polar properties of ceramic solid solutions on the base of the composition from Morphotropic Phase Boundary in the system (1-x)BiScO3 - xPbTiO3 with x = 0.645 (BSPT) was studied. Using the initial BSPT powders prepared from nitrates solutions dense single phase ceramic samples doped by the additives in amounts 5–15 w.% were obtained at 1050°C (2 h). The shift of initial BSPT composition from mixture of rhombohedral and tetragonal phases to tetragonal in case of the NaCl/KCl additives and to pseudocubic (rhombohedral) in case of the CaCl2/KCl additives was observed. Slight increase in the Curie temperature TC value from 673 to 681-679 K initiated by the addition of K+ ions into A site of perovskite lattice was observed in the samples doped by the NaCl/KCl additives, while monotonous decrease of the TC value was typical of the compositions doped by the CaCl2/KCl additives.