Proton Spin-Lattice Relaxation in Solid Wurster's Blue Perchlorate
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概要
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Temperature dependence of the proton spin-lattice relaxation time in powderedWflrster's blue perchlorate was measured between 56 and 300 K by using the90' -T -90' pulse NMR method at the frequencies 8.0, 12.0 and 23.4 MHz. In theparamagnetic state above the phase transition temperature of 190 K, the relaxa-tion talc was independent of temperature and of frequency and could be explainedby the hyperfine interaction modulated by an exchange interaction. Below T. therelaxation time increased with decreasing temperattu'e and depended on frequencyin accordance with BPP theory. The relaxation rate is proportional to the productof the triplet population and the effective exchange frequency both of which varywith temperature. Between 70 and 56 K, the relaxation rate is governed byparamagnetic impurities or monomer radicals.
- 1982-05-15
著者
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Akagi Yoshiro
Faculty Of Science Osaka University
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Kawamori Asako
Faculty Of Science Kwansei Gakuin University
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CHIHARA Hideaki
Faculty of Science, Osaka University
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Kawamori Asako
Faculty Of Science Kawansei Gakuin University
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Chihara Hideaki
Faculty Of Science Osaka University
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