Papers by Keyword: EPR

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Authors: X. Gratens, Samih Isber, S. Charar, Z. Golacki
Abstract: The magnetic susceptibility of Pb1-xCexX (X = S, Se and Te) crystals with several Cerium concentrations ranging from x = 0.006 to 0.036 has been measured between 2 K and 300 K. The experimental susceptibility curves were found to be consistent with a 2F5/2 lowest manifold for Ce3+ ions; the cubic crystal-field splitting values of 2F5/2 were estimated to be about 340 K, 440 K and 540 K for Pb1-xCexTe, Pb1-xCexSe, and Pb1-xCexS, respectively. For all the studied samples, it was found that the 7 doublet lies below the 8 quadruplet. These results confirm that Ce3+ ions substitute Pb2+ in the host crystals. Furthermore, the effective Landé factors were determined by X-band (~9.5 GHz) Electron Paramagnetic Measurements (EPR) to be g = 1.333, 1.364, and 1.402 for Ce ions in PbX, X = S, Se, and Te, respectively.
Authors: W. Sullivan, John W. Steeds, Hans Jürgen von Bardeleben, J.L. Cantin
Abstract: Several 4H SiC samples have been electron-irradiated at near threshold energies at low fluence, either along the [0001] or [000-1] direction. PL and EPR techniques have been used to investigate the dependence of the beam direction on defect generation and, together with a sample irradiated at a higher fluence, to correlate differences brought about by irradiating with a change in electron fluence. Attempts are made to correlate the information derived from the two techniques.
Authors: X. Zhou, G.D. Watkins, K.M. McNamara Rutledge
Authors: Da Yong Lu, Xiu Yun Sun
Abstract: The electron paramagnetic resonance (EPR) technique was employed to investigate the point defects in barium strontium titanate ceramics. All samples showed a strong EPR signal with g = 2.000, which was indexed as intrinsic Ti-vacancy defects. In (Ba0.85Sr0.15)TiO3 ceramic, which showed a tetragonal symmetry and consisted of the crystallites with average size of ~ 220 nm, a novel EPR powder spectrum was observed - the g-factor of the g = 2.000 signal evolved into a g-tensor, and the two weak signals with g3 = ~ 2.6 and g1 = ~ 1.6 gradually shifted toward the g2 = 2.000 signal and approached to each other with increasing temperature.
Authors: Thomas Anderson, Donovan L. Barrett, J. Chen, W.T. Elkington, Ejiro Emorhokpor, A. Gupta, C.J. Johnson, R.H. Hopkins, Charles Martin, Thomas Kerr, E. Semenas, Andrew E. Souzis, C.D. Tanner, Murugesu Yoganathan, Ilya Zwieback
Authors: Victor Bratus', Roman Melnyk, Sergii Okulov, Bela Shanina, Volodymyr Golub, Iryna Makeeva
Abstract: EPR spectroscopy has been used to characterize neutron-irradiated cubic SiC samples after thermal annealing in the 200-1100OC temperature range. Three new paramagnetic defects named Ky6, Ky7 and Ky8 have been revealed. Based on the present results, these defects have been tentatively attributed to the negatively charged carbon vacancy-carbon antisite pair, negatively charged divacancy and neutral carbon <100> split interstitial, respectively. Furthermore, the finding of practically isotropic hyperfine splitting for EPR lines of the T6 center confirms its assignment as a carbon vacancy-interstitial pair.
Authors: M.V.B. Pinheiro, Th. Lingner, F. Caudepon, Siegmund Greulich-Weber, Johann Martin Spaeth
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