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Research for Ferroelectricity of Substances including Tetramethylammonium Radical in the Ammonium Sulfate Family.

硫酸铵家族中四甲基铵自由基等物质的铁电性研究。

基本信息

批准号：
60540215
负责人：
SAWADA Shozo
金额：
$ 1.02万
依托单位：
Meisei University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1986
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-60540215/
关键词：
Tetrametylammonium radical Ammonium sulfate family ferroelectrics Ferroelectrics 遂次相転移

项目摘要

The ferroelectrics in the ammonium sulfate [( <NH_4> ) <_2> <SO_4> ] family substances including tetramethylammonium [N( <CH_3> ) <_4> ] radical, such as [N( <CH_3> ) <_4> ] <_2> Zn <Cl_4> , [N( <CH_3> ) <_4> ] <_2> Co <Cl_4> ,[N( <CH_3> ) <_4> ] <_2> Cu <Br_4> , etc., are known. On the other hand, ABX <Y_4> -type ferroelectrics like RbLi <SO_4> and <NH_4> Li <SO_4> have been reproted. Therefore, single crystals of [N( <CH_3> ) <_4> ] <_2> X <Y_4> - and N( <CH_3> ) <_4> BX <Y_4> - (B:monovalent cation, X <Y_4> : <SO_4> , Zn <Cl_4> , etc.) type materials were prepared and their physical properties were measured from the view point of investigation of ferroelectricity in these substances.First, we reported the dielectric properties and the features of thermal anomaly and thermal dilatation of ferroelectric [N( <CH_3> ) <_4> ] <_2> Zn <Cl_4> and [N( <CH_3> ) <_4> ] <_2> Co <Cl_4> in detail.Two kinds of crystals were obtained from the aqueous solution of chemical formula N( <CH_3> ) <_4> H … More <SO_4> . It was found that one of them grown at about 40 ゜C is N( <CH_3> ) <_4> H <SO_4> ・ <H_2> O and the other grown at about 90 ゜C is intermediate material between N( <CH_3> ) <_4> H <SO_4> and N( <CH_3> ) <_4> H <SO_4> ・ <H_2> O. It was also found that the former shows ferroelectricity in a temperature range between -104 ゜C and about 40 ゜C. We cannot prepare perfect crystals of N( <CH_3> ) <_4> H <SO_4> , yet.Usually, single crystals of [N( <CH_3> ) <_4> ] <_2> Ni <Cl_4> are grown by means of the evaporation method using an organic solvent. Single crystals prepared by the evaporation of aqueous solution of N( <CH_3> ) <_4> Cl : Ni <Cl_2> = 2 : 1 mixture at about 80 ゜C were found to be N( <CH_3> ) <_4> Ni <Cl_3> and to show distinct phase transitions at -106 ゜C and 160 ゜C.In this research, we tried to prepare many kinds of crystals of materials including tetramethylammonium radical in the ammonium sulfate family, and studied on the feature of their phase transitions. Hereafter, we want to carry out the study for the A B X <Y_4> -type substances in the ammonium sulfate family, especially such as RbLi <SO_4> , and to clarifiy the origins of the dielectric properties, the incommensuration, etc. of these materials. Less

硫酸铵[（）]族物质中的铁电体<NH_4><_2><SO_4>包括四甲基铵[N（<CH_3>）<_4>]基，如[N（<CH_3>）<_4>] <_2>Zn<Cl_4>、[N（<CH_3>）<_4>] <_2>Co<Cl_4>、[N（<CH_3>）<_4>] <_2>Cu<Br_4>等，是已知的。另一方面，ABX<Y_4>型铁电体如RbLi<SO_4>和<NH_4>Li<SO_4>也被报道.因此，[N（<CH_3>）<_4>] <_2>X<Y_4>-和N（<CH_3>）<_4>BX<Y_4>-（B：一价阳离子，X<Y_4>：<SO_4>，Zn<Cl_4>等）的单晶可用于制备单晶。从研究铁电性的角度出发，制备了两种类型的铁电材料，并测量了它们的物理性质。首先，我们详细报道了铁电[N（）] Zn和[N（）] Co的介电性质、热反常和热膨胀特征<CH_3><_4><_2><Cl_4><CH_3><_4><_2><Cl_4>。从化学式为N（）H的水溶液中得到了两种晶体<CH_3><_4> ...更多信息 <SO_4> .结果表明，在40 ℃左右生长的一种是<CH_3><_4>NH<SO_4>·<H_2>O，而在90 ℃左右生长的另一种是<CH_3><_4>NH<SO_4>和<CH_3><_4>NH<SO_4>·<H_2>O之间的中间产物。还发现前者在-104 ° C和约40 ° C之间的温度范围内显示铁电性。我们还不能制备出完美的N（OH<CH_3><_4>）2<SO_4>晶体。通常，[N（OH<CH_3>）2<_4>] <_2>Ni<Cl_4>的单晶是通过使用有机溶剂的蒸发方法生长的。用<CH_3>NCl<_4>：Ni <Cl_2>= 2：1的混合水溶液在80 ℃左右蒸发得到的单晶体为<CH_3>NCl <_4>Ni<Cl_3>，在-106 ℃和160 ℃下有明显的相变。本研究尝试制备了包括四甲基铵基在内的多种硫酸铵族材料的晶体，并研究了它们的相变特征。因此，我们要对硫酸铵族中的A B X<Y_4>型物质，特别是RbLi<SO_4>等进行研究，阐明这些材料的介电性能、介电常数等的来源。少