Abstract

Room-temperature changes in the structure of a new diisopropylammonium chloride (C₆H₁₆ClN, DIPAC) molecular ferroelectric have been investigated by high-resolution cross polarization/magic-angle spinning nuclear magnetic resonance (CP/MAS NMR) and X-ray diffraction (XRD) methods. The NMR measurements are carried out using ¹³C nuclei. Depending on time and heat treatment, monoclinic ferroelectric or orthorhombic nonpolar phases (as well as their coexistence) are observed. It is shown that the polar DIPAC modification at room temperature is transformed in the course of time into the nonpolar orthorhombic structure.

中文翻译：

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二异丙基氯化铵（DIPAC）分子铁电的结构演变

摘要

通过高分辨率交叉极化/磁角旋转核磁共振（CP / MAS NMR）和X射线研究了新型二异丙基氯化铵（C ₆ H ₁₆ ClN，DIPAC）分子铁电结构的室温变化。衍射（XRD）方法。NMR测量是使用¹³ C核进行的。根据时间和热处理，观察到单斜铁电或正交非极性相（以及它们的共存）。结果表明，室温下极性DIPAC的改性会随着时间的推移转变为非极性正交晶结构。