Fundamental studies for high temperature organic ferromagnet

高温有机铁磁体的基础研究

• 批准号: 11304052
• 负责人: KINOSHITA Minoru
• 金额: $ 20.99万
• 依托单位: Science University of Tokyo in Yomaguchi
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11304052/
• 关键词: organic ferromagnet; exchange interaction; interaction among electron spins; ferrimagnetism; TCNQ complexes; biradicals; electrical conductivity; TCNO錯体; フェリ磁性体; TCNQ錯体磁性; 分子間交換相互作用; 分子内交換相互作用; Cs_2(TCNQ)_3錯体の磁性; [N(CH_3)_4]_2(TCNQ)_3錯体の磁性

First of all, a new instrument (SQUID magnetometer) was introduced, and its ability was checked with a standard sample. Then, the magnetic properties of some TCNQ complexes were examined, because those complexes were reported to exhibit ferromagnetism even at room temperature. Several trials with carefully prepared samples under argon atmosphere led us to the conclusion that the ferromagnetism reported is erroneous, The magnetic properties of several stable biradicals based on nitronyl nitroxide were also investigated for the purpose to invent an organic ferrimagnet. Although interesting magnetic behavior was found on some biradical crystals, no ferrimagnet has been obtained. Another approach for a high critical temperature ferromagnet was also checked on some conducting organic solids, but no successful result has been observed until now. Further investigation on these lines is indispensable. On the other hand, the SQUID magnetometer has been modified for the measurements of temperature dependence of electrical conductivity and magnetoresistance, because the instrument is equipped with a good temperature control unit and a power supply for a high magnetic field. This trial seems to be successful and will be used further investigation on a magnetic-electrical composite materials.

首先介绍了一种新型仪器（SQUID磁强计），并用标准样品对其性能进行了验证。然后，研究了一些TCNQ配合物的磁性，因为这些配合物在室温下也表现出铁磁性。用精心制备的样品在氩气气氛下进行了几次试验，结果表明所报道的铁磁性是错误的。为了发明有机铁磁体，我们还研究了几种基于硝基氮氧化物的稳定双基的磁性。虽然在一些双基晶体上发现了有趣的磁性行为，但没有得到铁磁体。另一种高临界温度铁磁体的方法也在一些导电有机固体上进行了测试，但到目前为止还没有观察到成功的结果。这些方面的进一步调查是必不可少的。另一方面，由于SQUID磁力计配备了良好的温度控制单元和高磁场电源，因此对SQUID磁力计进行了改进，以测量电导率和磁电阻的温度依赖性。这一试验似乎是成功的，并将用于进一步研究一种磁电复合材料。

项目成果

Xingguo Chen: "Nanocomposite system of N-methylstilbazoliums intercalated into lamellar FePS_3"Synthetic Metals. 121. 1307-1308 (2001)

陈兴国：“N-甲基芪唑嵌入层状 FePS_3 的纳米复合体系”合成金属。

Xingguo, Chen..Chuluo, Yang..Jingui, Qin.Makoto, Inokuchi.Yohei, Fujii.Minoru, Kinoshita.Kyuya, Yakushi.Kenji, Ichimura. And Yunqi, Liu q: "Nanocomposity system of N-methyl-stillazoliums intercalated into lamellar FePS_3"Synthetic Metals. 121. 1307-1308 (

兴国、陈..楚罗、杨..金贵、秦.诚、井之口.阳平、藤井.稔、木下.九也、药师.健二、市村。

M.Kinoshita: "p-nitrophenyl nitronyl nitroxide:the first organic ferromagnet."Philosophical Transactions of the Royal Society. 357(1762). 2855-2872 (1999)

M.Kinoshita：“对硝基苯基硝基硝基氧：第一个有机铁磁体。”英国皇家学会哲学汇刊。

K.Takeda: "Exchange interactions in the genuine ferromagnet accompanying pressure-induced ferro-to antiferromagnetic transition"Chemical Physics Letters. 308. 181-186 (1999)

K.Takeda：“真正的铁磁体中的交换相互作用伴随着压力引起的铁磁到反铁磁的转变”化学物理快报。

M, Kinoshita.: "p-Nitrophenyl nitronyl nitroxide : the first organic ferromagnet"Philosophical Transactions of the Royal Society, London, series A. 357(1762). 2855-2872 (1999)

M，Kinoshita.：“对硝基苯基硝基硝基氧：第一个有机铁磁体”英国皇家学会哲学汇刊，伦敦，系列 A.357（1762）。