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Advances and Property Investigations of an Organic-Inorganic Ferroelectric: (diisopropylammonium)2[CdBr4].
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2020-08-15 , DOI: 10.1021/acs.inorgchem.0c00830
Magdalena Rok 1 , Przemysław Starynowicz 1 , Agnieszka Ciżman 2 , Jan K Zaręba 3 , Anna Piecha-Bisiorek 1 , Grażyna Bator 1 , Ryszard Jakubas 1
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2020-08-15 , DOI: 10.1021/acs.inorgchem.0c00830
Magdalena Rok 1 , Przemysław Starynowicz 1 , Agnieszka Ciżman 2 , Jan K Zaręba 3 , Anna Piecha-Bisiorek 1 , Grażyna Bator 1 , Ryszard Jakubas 1
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The preparation of materials featuring more than one ferroelectric phase represents a promising strategy for controlling electrical properties arising from spontaneous polarization, since it offers an added advantage of temperature-dependent toggling between two different ferroelectric states. Here, we report on the discovery of a unique ferroelectric–ferroelectric transition in diisopropylammonium tetrabromocadmate (DPAC, (C6H16N)2[CdBr4]) with a Tc value of 244 K, which is continuous in nature. Both phases crystallize in the same polar orthorhombic space group, Iab2. The temperature-resolved second-harmonic-generation (SHG) measurements using 800 nm femtosecond laser pulses attest to the polar structure of DPAC on either side of the phase transition (PT). The dc conductivity parameters were estimated in both solid phases. The anionic substructure is in the form of [CdBr4]2– discrete complexes (0D), while in the voids of the structure, the diisopropylammonium cations are embedded. The ferroelectric properties of phases I and II have been confirmed by the reversible pyroelectric effect as well as by P–E loop investigations. On the basis of the dielectric responses, the molecular mechanism of the PT at 244 K has been postulated to be of mixed type with an indication of its displacive nature.
中文翻译：
有机-无机铁电体：（二异丙基铵）2 [CdBr4]的研究进展和性能研究。
具有多个铁电相特征的材料的制备代表了一种控制自发极化产生的电性能的有前途的策略，因为它提供了两种不同铁电态之间随温度变化的附加优点。在这里，我们报道了在四异丙基溴化二异丙基铵（DPAC，（C 6 H 16 N）2 [CdBr 4 ]）中发现一个独特的铁电-铁电跃迁的事实，T c值为244 K，这在自然界是连续的。两相在相同的正交正交空间群Iab中结晶2.使用800 nm飞秒激光脉冲进行的温度分辨第二谐波产生（SHG）测量证明了在相变（PT）两侧的DPAC的极性结构。在两个固相中都估计了直流电导率参数。阴离子亚结构为[CdBr 4 ] 2-离散配合物（0D）的形式，而在结构的空隙中嵌入了二异丙基铵阳离子。I和II相的铁电特性已经通过可逆热电效应以及P – E得以证实。循环调查。基于介电响应，假定在244 K时PT的分子机理为混合型，表明其具有置换性。
更新日期：2020-09-08
中文翻译：
有机-无机铁电体：（二异丙基铵）2 [CdBr4]的研究进展和性能研究。
具有多个铁电相特征的材料的制备代表了一种控制自发极化产生的电性能的有前途的策略，因为它提供了两种不同铁电态之间随温度变化的附加优点。在这里，我们报道了在四异丙基溴化二异丙基铵（DPAC，（C 6 H 16 N）2 [CdBr 4 ]）中发现一个独特的铁电-铁电跃迁的事实，T c值为244 K，这在自然界是连续的。两相在相同的正交正交空间群Iab中结晶2.使用800 nm飞秒激光脉冲进行的温度分辨第二谐波产生（SHG）测量证明了在相变（PT）两侧的DPAC的极性结构。在两个固相中都估计了直流电导率参数。阴离子亚结构为[CdBr 4 ] 2-离散配合物（0D）的形式，而在结构的空隙中嵌入了二异丙基铵阳离子。I和II相的铁电特性已经通过可逆热电效应以及P – E得以证实。循环调查。基于介电响应，假定在244 K时PT的分子机理为混合型，表明其具有置换性。
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