학술논문

In situ electric field-dependent structural changes in (Ba,Ca)(Zr,Ti)O3 with varying grain size.
Document Type
Article
Source
Journal of Applied Physics. 5/7/2024, Vol. 135 Issue 17, p1-12. 12p.
Subject
*GRAIN size
*PIEZOELECTRIC ceramics
*X-ray diffraction measurement
*BARIUM titanate
*ALKALINE earth metals
Language
ISSN
0021-8979
Abstract
The functional properties of piezoelectric ceramic materials, such as barium titanate, are highly dependent on grain size. Lead-free polycrystalline Ba0.85Ca0.15Zr0.1Ti0.9O3 (BCZT) samples were prepared with a combination of the hydrothermal method and spark plasma sintering to achieve grain sizes from 100 nm to 10 μm by varying the maximum sintering temperature. In this range, a transition from a nearly linear dielectric to a ferroelectric response can be seen in macroscopic electromechanical measurements, demonstrating the importance of grain size on functional properties in BCZT. Furthermore, in situ electric field-dependent synchrotron x-ray diffraction measurements were performed to quantify the intrinsic and extrinsic strain contributions and their variations with grain size. At lower grain sizes, the data revealed a significant loss of extrinsic contributions in the piezoelectric behavior, limiting the response to intrinsic contribution associated with lattice strain. For BCZT, a critical grain size between approximately 0.08 and 0.18 μm is proposed, below which no piezoelectric response was observed. [ABSTRACT FROM AUTHOR]