期刊
PHYSICAL REVIEW B
卷 82, 期 18, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.82.180101
关键词
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资金
- Deutsche Forschungsgemeinschaft [MI 1127/5-1]
- Bulgarian Ministry of Science and Education [BYX 308]
- ICREA Funding Source: Custom
Chemically B-site disordered PbSc1/2Ta1/2O3 relaxor crystals have been studied by means of dielectric and acoustic emission methods in the vicinity of T-m approximate to 280 K. Along with the intrinsic cubic-to-rhombohedral phase transformation at T-c = 261 K, a phase transformation at T-n = 293 K is evidently detected by acoustic emission. Under an external dc electric field T-c gradually increases with increasing the field, whereas T-n exhibits nontrivial behavior, namely, initially decreases and then starts increasing, similarly to T-c. The characteristic temperature T-n is attributed to the occurrence of incommensurate modulated antiferroelectric regions, which have previously been suggested to coexist with both the cubic paraelectric and rhombohedral ferroelectric phases in the vicinity of T-m. The nontrivial behavior of T-n under an external dc electric field is also discussed.
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