Abstract
Electron paramagnetic resonance (EPR) of VO2+ radicals incorporated in face-centred single crystals of NaCl, KC1 and RbCl has been studied in the temperature range of 77° K to 330° K. At liquid nitrogen temperature, anisotropic spectra have been recorded in each case while spectra recorded at room and higher temperatures are isotropic suggesting the existence of a fast readjustment of VO2+ molecular ions in the crystals at higher temperature while this motion gets hindered at liquid nitrogen temperatures. Spin-Hamiltonian constants are calculated from the recorded isotropic and anisotropic spectra. The line widths in each case are found to obey a parabolic law originally proposed by Kivelson. The constants which give a close fit have been evaluated. The random orientation and readjustment of V-0 bond in these alkali chloride crystals is explained on the assumption that the medium exhibits a “liquid-like” nature for VO2+ molecular ion as far as the electron paramagnetic resonance absorption is concerned.
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References
Dattatreya Sastry, M. and Venkateswarlu, P.Mol. Phys., 1967,13, 161.
Rao, K. V. S., Dattatreya Sastry, M. and Venkateswarlu, P.J. Chem. Phys., 1968,49, 1714.
Borcherts, R. H. and KikuchiIbid., 1964,40, 2270.
Moonigan, A. and Mackinnon, J. A.Canad J. Phys., 1967,45, 2769.
Rao, K. V. S., Dattatreya Sastry, M. and Venkateswarlu, P.J. Chem. Phys. 1968 (to be published).
Kivelson, D...Ibid., 1960,33, 1094.
Sands, R. H...Phys. Rev., 1955,99, 1222.
O’Reilly, D. E...J. Chem. Phys., 1958,29, 1188;Ibid., 1959,30, 591.
Abragam, A. and Pryce, M. H. L.Proc. Roy. Soc., (London), 1951,A 205, 135.
Bleaney, B.,..Phil. Mag. 1951,42, 441.
Hochstrasser, G...Phys. Chem. Glasses, 1966,7, 178.
Nieiman, R. and Kivelson, D.J. Chem. Phys., 1961,35, 156.
McConnell, H. M...Ibid., 1956,25, 709.
Rogers, R. N. and Pake, G. E.Ibid., 1960,33, 1107.
Wilson, R. and Kivelson, D.Ibid., 1966,44, 154.
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Preliminary results contained in this paper have been reported at the Nuclear Physics and Solid State Physics Symposium held at the Indian Institute of Technology, Madras, during February 27 to March 1, 1968.
National Science Foundation Senior Foreign Scientist Fellow. On leave from the Indian Institute of Technology, Kanpur, India.
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Jagannadham, A.V., Venkateswarlu, P. Electron paramagnetic resonance studies of VO2+ in single crystals of NaCl, KCl and RbCl. Proc. Indian Acad. Sci. 69, 307–315 (1969). https://doi.org/10.1007/BF03047326
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DOI: https://doi.org/10.1007/BF03047326