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Detection of Negative Thermal Expansion in a Single Crystal of Sr 0.75 Ba 0.25 Nb 6 O 2 Relaxor Ferroelectric by X-Ray Diffraction Analysis
Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques Pub Date : 2020-07-07 , DOI: 10.1134/s1027451020030234 A. P. Dudka
中文翻译:
X射线衍射分析检测Sr 0.75 Ba 0.25 Nb 6 O 2弛豫铁电单晶中的负热膨胀
更新日期:2020-07-07
Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques Pub Date : 2020-07-07 , DOI: 10.1134/s1027451020030234 A. P. Dudka
Abstract
The atomic structure of a single crystal of Sr0.75Ba0.25Nb6O2 representing a relaxor ferroelectric is determined from X-ray diffraction data. At nine temperatures within a range of 93–480 K, 12 experiments are performed. The experimental facilities (area detector, goniometer, and sample cooling system) are calibrated. The region of negative thermal expansion with respect to the unit-cell parameter с is revealed at 272–324 K. In the same region, an electrical resistance anomaly is observed. It is found that the structural parameters have a singularity at 296 K, in particular, an unusual thermal motion of atoms is observed. This correlates with a kink in the resistance–temperature curve at 297.5 K. The obtained results and analysis of published data indicate that, near room temperature, several physical properties of Sr0.75Ba0.25Nb6O2 relaxor at once have singularities, which can be explained by the revealed lattice instability.中文翻译:
X射线衍射分析检测Sr 0.75 Ba 0.25 Nb 6 O 2弛豫铁电单晶中的负热膨胀