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1.
B. P. Sorokin D. A. Glushkov L. N. Bezmaternykh V. L. Temerov I. A. Gudim K. S. Aleksandrov 《Physics of the Solid State》2004,46(3):458-461
Single crystals of lead gallium germanate Pb3Ga2Ge4O14 are grown from their own solution melts. The propagation of bulk acoustic waves is investigated, and the elastic, piezoelectric, and dielectric constants are calculated. The temperature dependences of the dielectric constants of this compound are analyzed. 相似文献
2.
A. S. Aleksandrovsky I. A. Gudim A. S. Krylov V. L. Temerov 《Physics of the Solid State》2007,49(9):1695-1699
The optical absorption and luminescence spectra of single crystals of yttrium aluminum borate YAl3(BO3)4 doped with manganese ions are measured. It is established that the optical absorption spectra of yttrium aluminum borate single crystals doped with manganese ions are determined primarily by the contribution from the Mn4+ ions. The luminescence spectra of the YAl3(BO3)4 single crystals doped with manganese exhibit narrow lines attributed to the Mn4+ ions and an extended multiband structure which is associated primarily with the contribution from the Mn2+ ions. 相似文献
3.
A. A. Mukhin G. P. Vorob’ev V. Yu. Ivanov A. M. Kadomtseva A. S. Narizhnaya A. M. Kuz’menko Yu. F. Popov L. N. Bezmaternykh I. A. Gudim 《JETP Letters》2011,93(5):275-281
The colossal (more than threefold) decrease in the dielectric constant ɛ in the easy-plane SmFe3(BO3)4 ferroborate in a magnetic field of ∼5 kOe applied in the basal ab plane of the crystal has been found. A close relation of this effect to anomalies in the field dependence of the electric
polarization has been established. It has been shown that this magnetodielectric effect is due to the contribution to ɛ from
the electric susceptibility, which is related to the rotation of spins in the ab plane, arises in the region of the antiferromagnetic ordering T < T
N
= 33 K, and is suppressed by the magnetic field. A theoretical model describing the main features of the behavior of ɛ and
electric polarization in the magnetic field has been proposed, taking into account the additional anisotropy in the basal
plane induced by the magnetoelastic stresses. 相似文献
4.
5.
V. I. Zinenko M. S. Pavlovskii A. S. Krylov I. A. Gudim E. V. Eremin 《Journal of Experimental and Theoretical Physics》2013,117(6):1032-1041
Raman spectra of light are obtained for HoFe3(BO3)4 and HoAl3(BO3)4 crystals at various temperatures and are used for determining the frequencies of crystal lattice vibrations at the center of the Brillouin zone. It is also found that the HoFe3(BO3)4 crystal exhibits a phase transition at T c ≈ 366 K. The magnetoelectric effect in the paramagnetic phase of these compounds is studied experimentally. The lattice vibration frequencies, elastic and piezoelectric moduli, Born dynamic charges, and the high-frequency permittivity are calculated using the density functional method. A peculiar behavior of the transverse acoustic vibration branch is observed in the Γ → Z direction of the Brillouin zone of the HoFe3(BO3)4 crystal. The electric polarization induced by an external field is estimated using the calculated values of piezoelectric moduli and experimental values of magnetostriction. 相似文献
6.
L. N. Bezmaternykh A. D. Vasilev I. A. Gudim V. L. Temerov 《Crystallography Reports》2004,49(2):271-274
Conditions for the flux synthesis of Pb3Ga2Ge4O14 and Ba3Ga2Ge4O14 single crystals and their solid solutions Pb3 − x
BaxGa2Ge4O14 are studied. Structural analysis showed that the Ga3+-and Ge4+-cation positions in flux-grown Pb3Ga2Ge4O14 and Ba3Ga2Ge4O14 single crystals are not mixed.
__________
Translated from Kristallografiya, Vol. 49, No. 2, 2004, pp. 325–328.
Original Russian Text Copyright ? 2004 by Bezmaternykh, Vasil’ev, Gudim, Temerov.
This work was presented at the National Conference on Crystal Growth (NCCG-2002, Moscow). 相似文献
7.
E. S. Smirnova O. A. Alekseeva A. P. Dudka I. A. Verin V. V. Artemov L. N. Bezmaternykh I. A. Gudim K. V. Frolov I. S. Lyubutin 《Crystallography Reports》2016,61(4):558-565
The structure of GdFe3(BO3)4 single crystals has been studied by X-ray diffraction at 293 and 90 K. The crystals are grown from a flux in the Bi2Mo3O12–B2O3–Li2MoO4–Gd2O3–Fe2O3 system. The results of chemical analysis and structural study show that these crystals contain bismuth as an impurity. It is found that bismuth atoms are located at gadolinium sites in the structure. A decrease in the temperature is accompanied by a lowering of the symmetry from sp. gr. R32 (at 293 K) to sp. gr. P3121 (at 90 K). The presence of two types of iron chains with different geometries at 90 K promotes a change in the magnetic properties of these crystals with a decrease in the temperature. 相似文献
8.
M. N. Popova E. P. Chukalina B. Z. Malkin D. A. Erofeev L. N. Bezmaternykh I. A. Gudim 《Journal of Experimental and Theoretical Physics》2014,118(1):111-123
The optical spectra of oriented SmFe3(BO3)4 single crystals are studied in the region of the f-f transitions in the Sm3+ ion by Fourier spectroscopy. The energies, the symmetry properties, and the exchange splittings of the Stark sublevels of the ground and 17 excited multiplets of the Sm3+ ion in a crystal field of symmetry D 3 are determined from the measured temperature dependences of polarized-radiation absorption spectra. The parameters of the crystal field acting on samarium ions and the parameters of the exchange interaction between Sm3+ and Fe3+ ions are found. The anisotropy of the effective exchange interaction is shown to be substantially stronger than the magnetic anisotropy, due to a strong crystal-field-induced mixing of the ground and excited multiplets. 相似文献
9.
L. T. Denisova V. M. Denisov I. A. Gudim V. L. Temerov N. V. Volkov G. S. Patrin L. G. Chumilina 《Physics of the Solid State》2014,56(5):926-928
The molar heat capacity of TbFe3(BO3)4 in the temperature range of 346–1041 K has been measured by differential scanning calorimetry. It has been found that the C p = f(T) curve does not show extremes. The thermodynamic properties of the oxide compound have been determined from the experimental data. 相似文献
10.
Yu. V. Gerasimova S. N. Sofronova I. A. Gudim A. S. Oreshonkov A. N. Vtyurin A. A. Ivanenko 《Physics of the Solid State》2016,58(1):155-159
Infrared absorption spectra of a Nd0.5Ho0.5Fe3(BO3)4 crystal in the spectral range of 30–1700 cm–1 have been measured at temperatures from 6 to 300 K. The experimental spectra have been analyzed based on the semiempirical calculation of the lattice dynamics and the analysis of correlation diagrams of borate complexes. No changes associated with structural phase transitions have been detected in the temperature range of measurements; the effect of magnetic ordering on the infrared absorption spectra has not been observed. 相似文献