论文标题
关于三立方三碘化物的动态结构域和临界散射的问题
On the question of dynamic domains and critical scattering in cubic methylammonium lead triiodide
论文作者
论文摘要
我们使用高分辨率中子光谱法研究了完全剥离的单晶体，研究了立方ch $ _3 $ _3 $ _3 $ _3 $ _3 $ _3 $ _3 $ _3 $ _3 $的动态四方域的假设。 $ \ textIt {r} $ - 点散射在327.5 k四方立方间过渡始终是能量限制的，因此与动态域预测不一致。相反，这种行为与在其他钙钛矿中观察到的中心峰现象一致。散射可能起源于小的，静态的四方相结构域，这些结构域对晶体缺陷进行了成核，温度依赖性证明了过渡是一阶。
We investigate the hypothesis of dynamic tetragonal domains occuring in cubic CH$_3$NH$_3$PbI$_3$ using high-resolution neutron spectroscopy to study a fully deuterated single crystal. The $\textit{R}$-point scattering above the 327.5 K tetragonal-cubic phase transition is always resolution-limited in energy and therefore inconsistent with dynamic domain predictions. This behavior is instead consistent with the central peak phenomenon observed in other perovskites. The scattering may originate from small, static, tetragonal-phase domains nucleating about crystal defects, and the temperature dependence demonstrates the transition is first-order.
