1988 Fiscal Year Final Research Report Summary
Low-Dimensional Magnetism in Vermiculites
| Project/Area Number |
62540614
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
鉱物学(含岩石・鉱床学)
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| Research Institution | Institute for Solid State Physics |
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Principal Investigator |
NISHIHARA Hironori Institute for Solid State Physics, University of Tokyo, 物性研究所, 助手 (90107441)
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| Co-Investigator(Kenkyū-buntansha) |
YASUOKA Hiroshi Institute for Solid State Physics, University of Tokyo, 物性研究所, 教授 (50026027)
KOGA Kei-ichi Institute for Solid State Physics, University of Tokyo, 物性研究所, 教務職員 (40114475)
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| Project Period (FY) |
1987 – 1988
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| Keywords | clay / layered silicate / vermiculite / intercalation / magnetic phase transition / low-dimensional magnetism / magnetization / 磁気相転移 |
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| Research Abstract |
Measurements of static magnetic susceptibility, AC magnetic susceptibility and high-field magnetization process are reported for crystals of natural vermiculite and of vermiculite intercalation compounds (VIC's) intercalated of magnetic ions of Mn, Cu, Co and Ni. Small amount of iron atoms in natural vermiculite is suggested to be mostly in Fe^<3+> state. Ferromagnetic interactions with Weiss constant of 10-20 K have been observed in the crystals of Ni-VIC. The susceptibility of Ni-VIC is suppressed at low temperatures and anomalies suggesting successive phase transitions have been observed in the temperature dependence of the AC susceptibility. The behaviors of the susceptibilities and the high-field magnetization at low temperatures are interpreted with a simple model of low dimensional magnetic system with predominant ferromagnetic interaction within magnetic sublattice together with weak antiferromagnetic interaction between sublattices. Amount of the magnetic ions intercalated are evaluated and the arrangement of the magnetic atoms in interlayer space of VIC's are discussed.
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