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- W4387241395 abstract "Halide perovskites and elpasolites are key for optoelectronic applications due to their exceptional performance and adaptability. However, understanding their crucial elastic properties for synthesis and device operation remains limited. We performed temperature- and pressure-dependent synchrotron-based powder X-ray diffraction at low pressures (ambient to 0.06 GPa) to investigate their elastic properties in their ambient-pressure crystal structure. We found common trends in bulk modulus and thermal expansivity, with an increased halide ionic radius (Cl to Br to I) resulting in greater softness, higher compressibility, and thermal expansivity in both materials. The A cation has a minor effect, and mixed-halide compositions show intermediate properties. Notably, thermal phase transitions in MAPbI3 and CsPbCl3 induced lattice softening and negative expansivity for specific crystal axes, even at temperatures far from the transition point. These results emphasize the significance of considering temperature-dependent elastic properties, which can significantly impact device stability and performance during manufacturing or temperature sweeps." @default.
- W4387241395 created "2023-10-03" @default.
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- W4387241395 date "2023-10-02" @default.
- W4387241395 modified "2023-10-17" @default.
- W4387241395 title "Which Ion Dominates the Temperature and Pressure Response of Halide Perovskites and Elpasolites?" @default.
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- W4387241395 doi "https://doi.org/10.1021/acs.jpclett.3c02403" @default.
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