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首页> 外文期刊>RSC Advances >The phase diagram of a mixed halide (Br, I) hybrid perovskite obtained by synchrotron X-ray diffraction
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The phase diagram of a mixed halide (Br, I) hybrid perovskite obtained by synchrotron X-ray diffraction

机译：通过同步X射线衍射获得的混合卤化物（BR，I）杂交钙钛矿的相图

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By using synchrotron X-ray powder diffraction, the temperature dependent phase diagram of the hybrid perovskite tri-halide compounds, methyl ammonium lead iodide (MAPbI _(3) , MA ~(+) = CH _(3) NH _(3) ~(+) ) and methyl ammonium lead bromide (MAPbBr _(3) ), as well as of their solid solutions, has been established. The existence of a large miscibility gap between 0.29 ≤ x ≤ 0.92 (±0.02) for the MAPb(I _(1? x ) Br _( x ) ) _(3) solid solution has been proven. A systematic study of the lattice parameters for the solid solution series at room temperature revealed distinct deviations from Vegard's law. Furthermore, temperature dependent measurements showed that a strong temperature dependency of lattice parameters from the composition is present for iodine rich compositions. In contrast, the bromine rich compositions show an unusually low dependency of the phase transition temperature from the degree of substitution.
机译：通过使用同步旋流X射线粉末衍射，杂交钙钛矿三卤化物的温度依赖性相图，甲基铵铅碘化物（MAPBI _（3），MA〜（+）= CH _（3）NH _（3）已经建立了〜（+））和甲基氯溴化铵（MAPBBR _（3））以及它们的固溶体。对于MAPB的0.29≤x≤0.92（±0.02）的存在大的混溶性差距（I _（1？x）Br _（x））_（3）固体解决方案已被证明。在室温下固体溶液系列的晶格参数的系统研究显示了vegard的定律明显偏差。此外，温度依赖性测量表明，对于碘富含组合物，存在来自组合物的晶格参数的强烈温度依赖性。相反，溴富含组合物从取代程度显示相变温度的异常低依赖性。

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