Journal
RUSSIAN PHYSICS JOURNAL
Volume 59, Issue 12, Pages 2162-2167Publisher
SPRINGER
DOI: 10.1007/s11182-017-1028-4
Keywords
solid solutions; dielectric properties; barium strontium titanate
Categories
Funding
- SFU [0110-11 / 2017-35, CU 0110-11 / 2017-36]
- Russian Federation [MK-3232-2015-2, SP - 3330.2016.3]
- [3.6371.2017/BP]
- [3.6439.2017/BP]
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Samples of solid solutions of the system Ba1-x Sr (x) TiO3 (0 <= x <= 1.0) are produced by solid-phase synthesis followed by sintering using conventional ceramic technology. Their crystal structure and grain structure are studied at room temperature and dielectric properties - in a wide range of external influences (temperature and frequency of the alternating electric field). Based on these results, the state diagram of the system is constructed including three single-phase fields with different-symmetry (tetragonal, pseudocubic, and cubic) and two morphotropic fields with coexistence of the tetragonal and pseudocubic, pseudocubic and cubic phases. Peculiarities of the grain landscape associated with the formation of morphotropic areas and melting of barium hydroxide are revealed. The dependence of the dielectric properties of solid solutions on their crystal-chemical specifics and position in the phase diagram of the system is demonstrated. A conclusion is made about the possibility of using the compositions with x = 0.2 to create materials with high dielectric constants promising for applications in microelectronics.
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