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Article
Spectroscopic Investigation of Structural and Magnetic Properties of TbCr3(BO3)4
The paper presents a flux crystal growth technique, studies of the structural peculiarities and the optical absorption spectra of double orthoborate TbCr3(BO3)4 with a huntite structure. The intensities of the ph...
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Article
Optical Linear Dichroism in the ab-Plane of NdFe3(BO3)4 Ferroborate
The high-resolution optical absorption spectra of NdFe3(BO3)4 single crystals have been recorded at temperatures from 4 to 40 K in the IR range of f–f transitions in a Nd3+ ion. Light linearly polarized at differ...
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Article
Synthesis and Optical Properties of Nickel-Doped Copper Metaborate Crystals
This work presents information on the growth and spectroscopic study of single crystals of copper metaborate doped with nickel Cu1–xNixB2O4 (x = 0.05, 0.1). In the absorption spectra of both crystals, satellites ...
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Article
Transmission Spectra of Singe Crystals of MAPbI3 Hybrid Perovskites Near the Edge of Fundamental Absorption
The paper presents the transmission spectra of hybrid perovskite MAPbI3 single crystals near the fundamental absorption edge in a wide temperature range. The absorption coefficient α of the single crystal samples...
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Article
Anomalous Behavior of the \(E_{u}^{1}\) Infrared-active Phonon Mode in Bi2 – xSrxSe3 Crystal
We have studied spectral evolution of the \(E_{u}^{1}\) phonon line of a topological insulator Bi2 – xSrxSe3 w...
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Article
Structural Specific Features of Solid Solutions NdxGd1 – xCr3(BO3)4
Optical investigations of crystals of solid solutions NdxGd1 – xCr3(BO3)4, 0.01 ≤ x ≤ 1, have been performed. Absorption spectra in the range of wavenumbers 11 000–15 000 cm–1 recorded at cryogenic temperatures (...
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Article
New Lines in High Resolution IR Luminescence Spectra of SiC Single Crystals of the 4H and 6H Polytypes
We have studied high-resolution low-temperature IR luminescence and absorption spectra of undoped high-quality SiC single crystals of the 4H and 6H hexagonal modifications. Narrow lines with a width of smaller...
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Article
Growth and Spectroscopic and Magnetic Properties of TbCr3(BO3)4 Crystals
We have studied and optimized conditions for spontaneous flux growth of TbCr3(BO3)4 crystals. Phase relations in the pseudoternary system TbCr3(BO3)4–K2Mo3O10–B2O3 have been studied in the temperature range 900–1...
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Article
High-Resolution Spectroscopy of Low-Temperature Phase Transitions in Copper Metaborate CuB2O4
The linear magnetic dichroism in the crystallographically isotropic ab plane of a tetragonal CuB2O4 single crystal has been investigated by high-resolution Fourier spectroscopy at temperatures of 1.4–22 K. Magnet...
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Article
Luminescence and Nonlinear Optical Properties of Borates LnGa3(BO3)4 (Ln = Nd, Sm, Tb, Er, Dy, or Ho)
Luminescence spectra of single crystals of rare-earth gallium borates LnGa3(BO3)4 (Ln = Nd, Sm, Tb, Er, Dy, or Ho) at room (300 K) and cryogenic (10 K) temperatures are presented for the first time. Photoluminesc...
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Article
Deferred Registration of Nanophosphor Photoluminescence As a Platform for Optical Bioimaging
Detection systems with deferred registration of luminescence signals are promising for performing complex tasks of imaging of biological objects due to their simplicity and low cost. In the present work, β‑NaYF4:...
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Article
Infrared spectroscopy of europium borates EuM 3(BO3)4 (M = Al, Cr, Fe, Ga) with a huntite mineral type of structure
Huntite-like EuM 3(BO3)4 crystals (M = Al, Cr, Fe, or Ga) are synthesized by means of spontaneous crystallization from a solution in a melt. The infrared spectra of the compounds a...
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Article
Synthesis and X-ray crystallographic and IR spectroscopic study of complex alkaline earth zirconium arsenates
Arsenates A0.5Zr2(AsO4)3 (A = Mg, Ca, Sr, Ba), synthesized through sol–gel route with subsequent heat treatment, have been studied by X-ray diffraction, electron probe microanalysis, and IR spectroscopy. Mg0.5Zr2
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Article
Lattice dynamics and electronic structure of cobalt–titanium spinel Co2TiO4
The results are presented on phonon excitations and the electronic structure of Co2TiO4 inverse spinel in which magnetically ordered cobalt ions Co2+ (3d 7) are in equal amounts in...
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Article
Optical absorption spectra of the Bi+ impurity center in CsCdBr3 ternary bromide
Optical absorption spectra of the Bi+ impurity center isomorphically substituting Cs+ in CsCdBr3 are recorded over a wide temperature range (from 3.2 to 300 K). An analysis of the vibrational degrees of freedom o...
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Article
Germanium–vacancy color center in isotopically enriched diamonds synthesized at high pressures
We report on the high-pressure synthesis of novel nano- and microcrystalline diamonds with germanium–vacancy (Ge–V) color centers emitting at 602 nm. The synthesis was carried out in non-metallic growth system...
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Article
Magnetic, magnetoelastic, and spectroscopic properties of TmAl3(BO3)4
The thermodynamic properties of alumoborate TmAl3(BO3)4 single crystal are studied experimentally and theoretically. A theoretical analysis based on the crystal field model makes it possible to interpret all meas...
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Article
Production of nano- and microdiamonds with Si-V and N-V luminescent centers at high pressures in systems based on mixtures of hydrocarbon and fluorocarbon compounds
A new method has been proposed for the synthesis of nano- and microdiamonds with various contents of luminescent silicon-vacancy (Si-V) and nitrogen-vacancy (N-V) centers at high static pressures in growth sys...
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Article
IR active phonons in single crystals RFe3(BO3)4 (R = Pr, Nd, and Sm)
We have studied the reflection and transmission spectra of multiferroics RFe3(BO3)4 (R = Pr, Nd, and Sm) at room temperature. Simulation of reflection spectra by the dispersion-analysis method have allowed us to ...
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Article
Magnetization, magnetoelectric polarization, and specific heat of HoGa3(BO3)4
A comprehensive experimental and theoretical study of magnetic, magnetoelectric, thermal, and spectroscopic characteristics of HoGa3(BO3)4 gallium borate single crystals has been performed. A large magnetoelectri...
