Abstract
EPR and the method of dielectric losses have been used to investigate Fe3+ centers of axial and orthorhombic symmetry in KTaO3 single crystals. The EPR spectrum of orthorhombic-symmetry Fe3+ obtained in the 8-mm wavelength range at T=77 K is described by the spin-Hamiltonian \(\hat H = \beta (g_x H_x S_x + g_y H_y S_y + g_z H_z S_z ) + DS_z^2 + E(S_x^2 - S_y^2 )\) with parameters g x=1.98, g y=2.01, g z=2.00, D=0.43 cm−1, and E=5.87×10t-2 cm−1. From the dielectric measurement data we have obtained the following parameters of the relaxation of the orthorhombic Fe3+ centers in KTaO3: characteristic relaxation frequency τ −10 =2.33×1012 Hz and activation energy E a=0.044 eV. A model of the orthorhombic Fe3+ center in KTaO3 is discussed within the framework of the kinetic parameters obtained.
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References
G. Wessel and H. Goldlik, J. Appl. Phys. 39, 4855 (1968).
I. P. Bykov, M. D. Glinchuk, A. A. Karmazin, and V. V. Laguta, Fiz. Tverd. Tela 25, 3586 (1983) [Sov. Phys. Solid State 25, 2063 (1983)].
B. E. Vugmeister, M. D. Glinchuk, and A. P. Pechenyi, Fiz. Tverd. Tela 26, 3389 (1984) [Sov. Phys. Solid State 26, 2036 (1984)].
V. V. Laguta, M. D. Glinchuk, and A. P. Pechenyi, Fiz. Tverd. Tela 27, 2211 (1985) [Sov. Phys. Solid State 27, 1328 (1985)].
I. N. Geifman, I. V. Kozlova, B. K. Krulikovskii, and T. V. Son’ko, Dep. VINITI, Reg. No. 7670-V86.
A. P. Pechenyi, M. D. Glinchuk, T. V. Antimirova, and W. Kleeman, Phys. Status Solidi B 174, 325 (1992).
D. M. Hannon, Phys. Rev. 164, 366 (1967).
A. S. Nowick, S. Q. Fu, W.-K. Lee, B. S. Lim, and T. Scherban, Mater. Sci. Eng. B 23, 19 (1994).
V. V. Laguta, M. D. Glinchuk, A. A. Karmazin, and I. P. Bykov, Fiz. Tverd. Tela 27, 162 (1985) [Sov. Phys. Solid State 27, 94 (1985)].
B. Sacle, J. L. Gravil, and L. A. Boatner, J. Phys.: Cond. Matter. 6, 4077 (1994).
Yu. M. Poplavko, Physics of Insulators [in Russian] Kiev, (1980).
S. Maniv, A. Reuveni, and Z. Luz, J. Chem. Phys. 66, 2285 (1977).
I. Laulicht, Y. Yacobi, and A. Baram, J. Chem. Phys. 91, 79 (1989).
G. D. Watkins, Phys. Rev. 113, 91 (1959).
R. W. Dreyfus, Phys. Rev. 121, 1675 (1961).
K. Lal and D. R. Pahwa, Phys. Rev. B 4, 2741 (1971).
J. B. Wachtman, Phys. Rev. 131, 517 (1963).
M. Kh. Karapet’yants and S. I. Drakin, The Structure of Matter [in Russian] Moscow, (1978), p. 86.
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Fiz. Tverd. Tela (St. Petersburg) 39, 861–864 (May 1997)
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Geifman, I.N., Golovina, I.S. & Kozlova, I.V. EPR and dielectric relaxation of Fe3+ in KTaO3 . Phys. Solid State 39, 766–769 (1997). https://doi.org/10.1134/1.1129965
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DOI: https://doi.org/10.1134/1.1129965