29 Result(s)

Article

Fluorite-Like Phases Based on Barium and Rare-Earth Fluorides

Optically transparent single-crystal blocks are prepared by the fusion of a barium fluoride charge with yttrium and erbium fluorides using sodium fluoride as a flux. The crystal structures were solved and comp...

P. P. Fedorov, S. V. Volkov, Y. A. Vaitieva… in Journal of Structural Chemistry (2024)

Article

Thermophysical Characteristics of Single Crystals of Ba_{1 – x – y}Yb_xR_yF_{2 + x + y} (R = Tm, Ho) Solid Solutions

Single crystals of Ba_{1 – x – y}Yb_xR_yF_{2 + x + y} (R = Tm, Ho) solid solutions have been grown by the Bridgman technique in vacuum using a CF₄ fluorination atmosphere. We have measured their thermal conductivity in t...

S. V. Kuznetsov, V. A. Konyushkin, A. N. Nakladov, P. A. Popov… in Inorganic Materials (2023)

Article

Thermal Conductivity of Single Crystals of CaF₂–SrF₂–BaF₂–YbF₃ Solid Solutions

Single crystals of Ca_xSr_yBa_zF₂ (x = 0.31–0.4045, y = 0.31–0.50, z = 0.10–0.38) and Ca_xSr_yBa_zYb_0.005F_2.005 (x = 0.295–0.495, y = 0.30–0.50, z = 0.10–0.40) fluorite solid solutions have been grown by the Bridgman t...

P. A. Popov, A. A. Krugovykh, V. A. Konyushkin, A. N. Nakladov… in Inorganic Materials (2023)

Article

Thermal Conductivity of Single Crystals of CaF₂–BaF₂ Solid Solutions

Single crystals of Ca_{1 – х}Ba_хF₂ (x = 0.001–0.05 and 0.85–0.99) solid solutions have been grown by the Bridgman method, and their thermal conductivity has been measured in the range 50–300 K by an absolute steady-...

P. A. Popov, A. A. Krugovykh, A. A. Zentsova, V. A. Konyushkin… in Inorganic Materials (2022)

Article

Thermal Conductivity of Sr_{1 – x}Ba_xF₂ Single Crystals

The thermal conductivity κ of single crystals of the Sr_1–xBa_xF₂ fluorite solid solution series has been measured in the temperature range 50–300 K by an absolute steady-state axial heat flow technique. The therma...

P. A. Popov, A. A. Krugovykh, V. A. Konyushkin, A. N. Nakladov… in Inorganic Materials (2021)

Article

Thermophysical Properties of Single Crystals of CaF₂–SrF₂–RF₃ (R = Ho, Pr) Fluorite Solid Solutions

Single crystals of Ca_{1 – y}Sr_yR_хF_{2 + х} (R = Ho, Pr) solid solutions with high optical quality have been grown by the Bridgman technique in vacuum using a fluorination atmosphere. The thermal conductivity of the Ca

S. V. Kuznetsov, V. A. Konyushkin, A. N. Nakladov, E. V. Chernova… in Inorganic Materials (2020)

Article

Luminescence of GdF₃:Pr:Yb and YF₃:Pr:Yb Solid Solutions Synthesized by Crystallization from the Melt

Spectral and luminescence characteristics of GdF₃:Pr:Yb and YF₃:Pr:Yb solid solutions synthesized by crystallization from the melt were investigated. Down-conversion luminescence of Yb³⁺ in the region of ²F_5/2 →

A. S. Nizamutdinov, S. V. Kuznetsov, V. A. Konyushkin… in Journal of Applied Spectroscopy (2019)

Article

Thermal conductivity of single crystals of Ba_1–x R _x F_{2 + x} (R = La, Ce, Nd, or Gd) solid solutions

The thermal conductivity of single crystals of Ba_1–х R _х F_{2 + х ...}

P. A. Popov, P. P. Fedorov, V. A. Konyushkin in Crystallography Reports (2017)

Article

Formation of new Tm³⁺ tetragonal symmetry optical centers in CaF₂ hot-formed laser ceramics

By means of time-resolved site-selective spectroscopy the formation of new Tm³⁺ optical centers with modified local environment and presumably tetragonal local symmetry in CaF₂ hot-formed laser quality ceramics i...

M. E. Doroshenko, O. K. Alimov, A. G. Papashvili… in Optics and Spectroscopy (2017)

Article

Heat conductivity of Ca_1-x R _x F_2+x (R = La, Ce, or Pr; 0 ≤ x ≤ 0.25) heterovalent solid solutions

Heat conductivity of crystals of Ca_1–x R _x F_{2 + x ...}

P. A. Popov, P. P. Fedorov, V. A. Konyushkin in Crystallography Reports (2015)

Article

Thermophysical characteristics of Ca_1−x Sr _x F₂ solid-solution Crystals (0 ≤ x ≤ 1)

The thermal conductivity of crystals of a continuous series of isovalent Ca_{1 − x} Sr _x F₂ solid solutions has been experimentally investigated in the temperature r...

P. A. Popov, N. V. Moiseev, D. N. Karimov, N. I. Sorokin… in Crystallography Reports (2015)

Article

Influence of cellular substructure on the thermal conductivity of heterovalent solid solutions of fluorides

The thermal conductivity of single-crystal samples of Sr_0.88La_0.09Nd_0.03F_2.03 and Sr_0.80La_0.15Nd_0.05F_2.20 solid solutions, both with a cellular substructure and without it, have been investigated by the method of...

P. A. Popov, V. A. Konyushkin, A. N. Nakladov, S. V. Kuznetsov… in Crystallography Reports (2014)

Article

Thermal conductivity of LaF₃-based single crystals and ceramics

The thermal conductivity of lanthanum fluoride based single crystals and ceramics (LaF₃, La_0.975Nd_0.025F₃, and La_0.95Sr_0.05F_2.95) has been measured at temperatures from 50 to 693 K by an absolute steady-state axi...

P. A. Popov, N. V. Moiseev, A. V. Filimonova, P. P. Fedorov… in Inorganic Materials (2012)

Article

High repetition rate LiF ₂ ⁻ : Color center laser

The efficient oscillation of LiF:F ₂ ⁻ color center laser pumped by a compact LD-pumped Nd:YVO₄ acousto optically Q-switched laser with 30 kHz pulse repetition...

P. G. Zverev, Z. J. Liu, X. Y. Zhang, V. A. Konyushkin in Laser Physics (2011)

Article

Evolution of yttria nanoparticle ensembles

The formation of Y₂O₃ nanoparticles in precipitation from acidic nitrate aqueous solutions, which was done by regulating pH at the expense of their titration with an ammonium hydroxide aqueous solution, was studi...

P. P. Fedorov, V. V. Voronov, V. K. Ivanov, V. A. Konyushkin… in Nanotechnologies in Russia (2010)

Article

A study of the structure and scattering mechanisms of subterahertz phonons in lithium fluoride single crystals and optical ceramics

The methods of optical, electron, and atomic force microscopy (AFM) are applied to the study of the real structure of optical lithium fluoride ceramic obtained by hot deformation of single crystals. A comparat...

E. N. Khazanov, A. V. Taranov… in Journal of Experimental and Theoretical Ph… (2010)

Article

Transition from crystal-like to glass-like behavior of thermal conductivity in the Sr_0.16Ba_0.54La_0.30F_2.30 solid solution

Using a steady-state axial flow technique, we have measured the thermal conductivity of single crystals of congruently melting SrF₂-BaF₂-LaF₃ solid solutions from 50 to 300 K: Ba_0.66Sr_0.34F₂ (minimum in the melti...

P. A. Popov, P. P. Fedorov, V. A. Konyushkin, A. N. Nakladov… in Inorganic Materials (2010)

Article

Thermal conductivity of γ-irradiated LiF single crystals

The thermal conductivity of γ-irradiated lithium fluoride (LiF) single crystals has been studied using the method of stationary longitudinal heat flux in a temperature range of 50–300 K. An increase in the irr...

T. T. Basiev, V. A. Konyushkin, S. V. Kuznetsov, V. V. Osiko… in Technical Physics Letters (2008)

Article

Thermal conductivity of single crystals of Sr_{1 − x} Yb _x F_{2 + x} solid solution

P. A. Popov, P. P. Fedorov, V. A. Konyushkin, A. N. Nakladov… in Doklady Physics (2008)

Article

Thermal conductivity of single crystals of Ba_{1 − x} Yb _x F_{2 + x} solid solution

P. A. Popov, P. P. Fedorov, S. V. Kuznetsov, V. A. Konyushkin… in Doklady Physics (2008)