Kai Kamijo, Nobuo Nakajima, Dongxiao Fan, Andris Anspoks
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引用次数: 0
Abstract
A three-dimensional analysis method for X-ray absorption spectra, combining two-metal-edge extended X-ray absorption fine structure (EXAFS) analysis with reverse Monte Carlo simulations, was applied to study the cubic-to-tetragonal phase transition in SrTiO3 as a dielectric standard. This method allows for the evaluation of both the static distribution and the dynamic motion of atoms, including oxygen. The optimized clusters reveal that the TiO6 octahedron can rotate up to 2.7° below the phase transition temperature, driven by reduced A-site Sr dynamics. Within the framework of conventional EXAFS analysis, the high-precision determination of atomic positions using the two-metal-edge analysis for ternary materials enhances the detection of light elements, and the method is applicable to bimetallic oxides and nitrides.
期刊介绍：
Synchrotron radiation research is rapidly expanding with many new sources of radiation being created globally. Synchrotron radiation plays a leading role in pure science and in emerging technologies. The Journal of Synchrotron Radiation provides comprehensive coverage of the entire field of synchrotron radiation and free-electron laser research including instrumentation, theory, computing and scientific applications in areas such as biology, nanoscience and materials science. Rapid publication ensures an up-to-date information resource for scientists and engineers in the field.
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