Abstract
Ferro-piezoceramic materials (FPCM) with different degrees of ferrohardness were fabricated by double solid-phase synthesis followed by the sintering technique using hot pressing method. The X-ray studies carried out in a wide temperature range showed that with increasing temperature, each of the studied FPCM undergoes a series of phase transformations, accompanied by a change in the symmetry of the unit cell. In this case, near the phase transition to the nonpolar cubic phase, in each of the FPCM, the formation of a fuzzy symmetry region is observed, which is characterized by weak distortions and temperature–time instability of the crystal structure. The study of the piezoelectric modulus d33 in the quasi-static regime as a function of temperature made it possible to reveal the different nature of its behavior in materials of various degrees of ferrohardness. It was shown that the conservation of the state in ferrosoft materials above the Curie temperature is associated with the relaxation nature of the change in their properties, the existence of a region of fuzzy symmetry (noncubic phase) in them above the Curie temperature, and increased inertia of the system. The expediency of taking into account the presented results in the development of electromechanical converters based on FPCM of various degrees of ferrohardness, operated under temperature effects, including cyclic ones, was shown.
Highlights
Research Institute of Physics, Southern Federal University, 344090 Rostov-on-Don, Russia; Abstract: Ferro-piezoceramic materials (FPCM) with different degrees of ferrohardness were fabricated by double solid-phase synthesis followed by the sintering technique using hot pressing method
The huge information accumulated to date indicates that the multicomponent FPCM of the above type are extremely interesting for the purely scientific research, since they exhibit the patterns conditioned by their complex hierarchical structure, which has no analogues in other solids [6–11]
The highest rate of the change in d33 is possessed by the FS-materials due to the greater mobility of the domain structure, which readily responds to the external influences, including the temperature
Summary
The X-ray studies carried out in a wide temperature range showed that with increasing temperature, each of the studied FPCM undergoes a series of phase transformations, accompanied by a change in the symmetry of the unit cell. A series of the highly efficient FPCM possessing the desired parameters for various applications has been developed at the Scientific Research Institute of Physics of the Southern Federal University [1]. These are the materials of nine groups, the ranges of the values of the main electrophysical characteristics and the areas of their use are presented in [2]. The huge information accumulated to date indicates that the multicomponent FPCM of the above type are extremely interesting for the purely scientific research, since they exhibit the patterns conditioned by their complex hierarchical structure, which has no analogues in other solids [6–11]
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