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Secondary photorefractive centers in Sn_2P_2S_6:Sb crystals
Optics Letters, 2011Secondary photorefractive centers in Sb-doped Sn2P2S6 have a lifetime comparable to the formation time of the space-charge grating. This considerably affects the dynamics of two-beam coupling and results in a new type of transient gain enhancement for preilluminated samples.
Dean R, Evans +3 more
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On the V-centers in KBr Crystals
Journal of the Physical Society of Japan, 1958The natures of V bands in the additively colored crystals of KBr has been investigated. Mollwo's results were confirmed and extended. A new technique of additive coloring was devised to produce a high concentration of V centers in the crystal of KBr. By using this method, the degree of coloration could be increased by about ten times of.
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Stabilization of U1-centers and laser color centers in LiF:OH crystals
AIP Conference Proceedings, 2019The formation of U1-centers in LiF:OH crystals, γ-irradiated to a dose of 1.3×104 C/kg at a temperature of 80 K, is considered in this study. The band at νmax = 2315 cm−1 is the main band of local interstitial hydrogen ions vibrations, which is more stable at room temperature (in a few month) than the additional band at νmax = 2260 cm−1.
L. I. Bryukvina +2 more
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The Journal of Chemical Physics, 2019
The monodispersed hard-sphere system is one of the simplest models for the study of phase transitions. Despite intensive studies of crystallization and melting of hard-sphere face-centered cubic (FCC) crystals, the phase transformations of hard-sphere body-centered cubic (BCC) crystals have not been explored because hard spheres cannot form a stable ...
Feng Wang, Yilong Han
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The monodispersed hard-sphere system is one of the simplest models for the study of phase transitions. Despite intensive studies of crystallization and melting of hard-sphere face-centered cubic (FCC) crystals, the phase transformations of hard-sphere body-centered cubic (BCC) crystals have not been explored because hard spheres cannot form a stable ...
Feng Wang, Yilong Han
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Aggregation of impurity centers in ionic crystals
Russian Physics Journal, 2007Results of modeling of the aggregation process in complex centers of ionic crystals are presented. Concentration dependences of the number of paired centers are obtained. A nature of the paired luminescence centers is discussed.
M. K. Myrzahmet, K. S. Baktybekov
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Trapping centers in inse single crystals
Materials Chemistry and Physics, 1983Abstract A systematic investigation of centers acting in InSe single crystals has been carried out by means of the following electric and photoelectronic techniques: 1. a) Resistivity behaviour as a function of temperature, analyzed by the single donor-single acceptor model 2.
DI GIULIO, Massimo +4 more
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On the N Centers in KCl Crystals
Journal of the Physical Society of Japan, 1962The optical and thermal natures of N (N 1 and N 2 ) centers in additively colored KCl crystals were investigated. These centers were optically stable, but thermally sensitive. Their thermal stabilities were contrasting, N 1 center being far more stable than N 2 center. They were found to have intimate relations with R center.
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Crystal field at the impurity center sites in ionic crystals
Physics of the Solid State, 2005Perturbation theory is developed for second-quantized operators in a basis of partly nonorthogonal orbitals. This method may be helpful in carrying out ab initio calculations of the parameters of the crystal field at the impurity center sites. As an illustration, when estimating the crystal field parameters for Yb3+: KZnF3, some fitting parameters are ...
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Transient color centers in GGG crystals
Radiation Effects and Defects in Solids, 2002Electron pulse induced absorption and their decay kinetics have been investigated in samples of GGG crystals with different starting absorption spectra. It is shown that for all samples there appears a wide transient absorption (TA) band with two maxima in the region 14,000-17,000 v cm m 1 and 22,000-26,000 v cm m 1 .
P. Potera +5 more
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Color centers in lead molybdate crystals
Physics of the Solid State, 2003Color center formation in PbMoO4 crystals, originating from nonstoichiometric batch composition, BaO and Bi2O3 additions, high-temperature annealing of crystals, and UV illumination, is discussed. Additional optical absorption bands are identified. The photochromism of the crystals is shown to be due to charge exchange, Pb2+ + Mo6+ ⇄ Pb3+ + Mo5+, of ...
T. M. Bochkova +3 more
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