Abstract
The structure of Sr2IrO4 has been studied between 20 and 1273K using synchrotron X-ray diffraction. Sr2IrO4 undergoes an apparently continuous transition from I41/acd to I4/mmm near 1123K. The cooperative tilting of the corner sharing IrO6 octahedra in I41/acd results in highly anisotropic and unusual thermal expansion behavior with negative thermal expansion along the c-axis.
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