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Comparative Study of TlTiOPO4 and KTiOPO4 Crystals by Raman Spectroscopy
V.V.Atuchin,N.V.Surovtsev,V.I.Voronkova,V.N.Semenenko,V.K.Yanovskii,A.M.Pugachev 한양대학교 세라믹연구소 2003 Journal of Ceramic Processing Research Vol.4 No.2
Phonon spectra of TlTiOPO4 and KTiOPO4 have been measured in a few scattering geometries. A comparative analysis of the difference in the line positions has been performed. It has been shown that a strong relative shift of lines in the frequency range <100 cm-1 can be explained well by the mass ratio of the ions involved into vibration. At higher frequencies the mechanism of these shifts is more complicated and can be explained by the combined effect of a few factors.
Classification and search for novel binary acentric molybdate and wolfra-mate crystals
Atuchin, V.V.,Kidyarov, B.I. The Korea Association of Crystal Growth 2002 韓國結晶成長學會誌 Vol.12 No.6
The model of the shortest chemical bonds is applied for the classification of acentric simple and binary Mo(VI) and W(VI) oxides. It is shown that on the plane of the shortest chemical bonds the compounds are located into the rosette of three intersected ellipses. The correlation between the optical nonlinearity and combination of the bond lengths is discussed.
Structure and Chemistry of LiB3O5 (LBO) Optical Surfacs
V.V.Atuchin,L.D.Pokrovsky,V.G.Kesler,L.I.Isaenko,L.I.Gubenko 한양대학교 세라믹연구소 2003 Journal of Ceramic Processing Research Vol.4 No.2
The properties of LiB3O5 (LBO) surfaces have been studied with reflection high energy electron diffraction (RHEED) and Xray photoelectron spectroscopy (XPS). The superstructure ordering with the relations a=4a0, b=2b0 and c=2c0, where a0, b0 and c0 are the LBO cell parameters, has been detected by RHEED analysis. Depth profiling by XPS shows that the thickness of the top surface layer contaminated by carbon is ~20 Å. Electronic parameters of LBO have been defined for the surface cleaned by ion beam sputtering. The ratio of original elements at the surface is in close relation with the formal composition of LBO.
Atuchin, V.,Zhu, L.,Lee, S.H.,Kim, D.H.,Lim, C.S. Chemic Publishing Company 2014 Asian Journal of Chemistry Vol.26 No.5
The BaMO4 (M = Mo, W) particles have been synthesized successfully by a cyclic microwave-assisted metathetic method followed by heat-treatment. Well-crystallized BaMO4 (M = Mo, W) particles with a fine and octahedron-like morphology and the particle size of 1-2 mu m have been formed after annealing at 600 degrees C for 3 h. The synthesized BaMO4 (M = Mo, W) particles have been characterized by X-ray diffraction and scanning electron microscopy. The optical properties have been investigated by photoluminescence emission and Raman spectroscopy.
Yu. G. Denisenko,A. S. Aleksandrovsky,V.V.Atuchin,A. S. Krylovg,M. S. Molokeev,A. S. Oreshonkov,N. P. Shestakov,O. V. Andreev 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.68 No.-
Eu2(SO4)3 was synthesized by chemical precipitation method and the crystal structure was determined by Rietveld analysis. The compound crystallizes in monoclinic space group С2/с. In the air environment, Eu2(SO4)3 is stable up to 670 °C. The sample of Eu2(SO4)3 was examined by Raman, Fourier-transform infrared absorption and luminescence spectroscopy methods. The low site symmetry of SO4 tetrahedra results in the appearance of the IR inactive ν1 mode around 1000 cm−1 and ν2 modes below 500 cm−1. The band intensities redistribution in the luminescent spectra of Eu3+ ions is analyzed in terms of the peculiarities of its local environment.
Lim, Chang Sung,Atuchin, Victor V.,Aleksandrovsky, Aleksandr S.,Denisenko, Yuriy G.,Molokeev, Maxim S.,Oreshonkov, Aleksandr S. Materials Research Society of Korea 2019 한국재료학회지 Vol.29 No.12
New triple tungstate phosphors NaPbLa(WO<sub>4</sub>)<sub>3</sub>:Yb<sup>3+</sup>/Ho<sup>3+</sup> (x = Yb<sup>3+</sup>/Ho<sup>3+</sup> = 7, 8, 9, 10) are successfully fabricated by microwave assisted sol-gel synthesis and their structural and frequency upconversion (UC) characteristics are investigated. The compounds crystallized in the tetragonal space group I4<sub>1</sub>/a and the NaPbLa(WO<sub>4</sub>)<sub>3</sub> host have unit cell parameters a = 5.3927(1) and c = 11.7961(3) Å, V = 343.05(2) Å<sup>3</sup>, Z = 4. Under excitation at 980 nm, the phosphors have yellowish green emissions, which are derived from the intense <sup>5</sup>S<sub>2</sub>/<sup>5</sup>F<sub>4</sub>→<sup>5</sup>I<sub>8</sub> transitions of Ho<sup>3+</sup> ions in the green spectral range and strong <sup>5</sup>F<sub>5</sub>→<sup>5</sup>I<sub>8</sub> transitions in the red spectral range. The optimal Yb<sup>3+</sup>:Ho<sup>3+</sup> ratio is revealed to be x = 9, which is attributed to the quenching effect of Ho<sup>3+</sup> ions, as indicated by the composition dependence. The UC characteristics are evaluated in detail under consideration of the pump power dependence and Commission Internationale de L'Eclairage chromaticity. The spectroscopic features of Raman spectra are discussed in terms of the superposition of Ho<sup>3+</sup> luminescence and vibrational lines. The possibility of controlling the spectral distribution of UC luminescence by the chemical content of tungstate hosts is demonstrated.
Lim, Chang Sung,Aleksandrovsky, Aleksandr S.,Molokeev, Maxim S.,Oreshonkov, Aleksandr S.,Atuchin, Victor V. ELSEVIER SCIENCE 2017 JOURNAL OF ALLOYS AND COMPOUNDS Vol.713 No.-
<P><B>Abstract</B></P> <P>Ternary scheelite-type molybdate NaSrLa<SUB>(1-<I>x</I>-<I>y</I>)</SUB>(MoO<SUB>4</SUB>)<SUB>3</SUB>:<I>x</I>Er<SUP>3+</SUP>,<I>y</I>Yb<SUP>3+</SUP> (<I>x</I> = <I>y</I> = 0, <I>x</I> = 0.1 and <I>y</I> = 0.2, <I>x</I> = 0.05 and <I>y</I> = 0.45, <I>x</I> = 0.2 and <I>y</I> = 0) phosphors were successfully synthesized by the microwave sol-gel method for the first time. Well-crystallized particles formed after the heat-treatment at 900 °C for 16 h showed a fine and homogeneous morphology with a particle size of 2–3 μm. The crystal structures were refined by the Rietveld method in space group <I>I</I>4<SUB>1</SUB>/<I>a</I>. The optical properties were examined comparatively using photoluminescence emission and Raman spectroscopy. Under the excitation at 980 nm, the NaSrLa<SUB>0.7</SUB>(MoO<SUB>4</SUB>)<SUB>3</SUB>:0.1Er<SUP>3+</SUP>,0.2Yb<SUP>3+</SUP> and NaSrLa<SUB>0.5</SUB>(MoO<SUB>4</SUB>)<SUB>3</SUB>:0.05Er<SUP>3+</SUP>,0.45Yb<SUP>3+</SUP> particles exhibited a strong 525-nm emission band, a weaker 550-nm emission band in the green region and weak 655-nm, 490-nm and 410-nm emission bands in the red, blue and violet regions. The pump power dependence and Commission Internationale de L'Eclairage chromaticity of the upconversion emission intensity were evaluated in detail. The presence of Sr in NaSrLa(MoO<SUB>4</SUB>)<SUB>3</SUB>, in comparison with NaCaLa(MoO<SUB>4</SUB>)<SUB>3</SUB> compound, leads to frequency shift mainly in the low region of Raman spectra. The MoO<SUB>4</SUB> bending vibrations are most susceptible to changes in the distance between the nearest oxygen atoms in the nearest neighboring MoO<SUB>4</SUB> groups.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The NaSrLa(MoO<SUB>4</SUB>)<SUB>3</SUB>:Er<SUP>3+</SUP>,Yb<SUP>3+</SUP> phosphors were synthesized by the microwave method. </LI> <LI> The crystal structures were refined by the Rietveld method in space group <I>I</I>4<SUB>1</SUB>/<I>a</I>. </LI> <LI> Under the excitation at 980 nm, a strong green emission is observed in the phosphors. </LI> </UL> </P>
High-temperature oxidation of europium (II) sulfide
Yuriy G. Denisenko,Maxim S. Molokeev,Alexander S. Krylov,Aleksandr S. Aleksandrovsky,Aleksandr S. Oreshonkov,Victor V. Atuchin,Nikita O. Azarapin,Pavel E. Plyusnin,Elena I. Sal’nikova,Oleg V. Andreev 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.79 No.-
The process of high-temperature oxidation of EuS in the air was explored in the temperature range of500–1000 C. The oxidation reaction enthalpy was determined (DH0exp =1718.5 kJ/mol). The study ofoxidation products allowed to establish the mechanism of EuS oxidation with oxygen. At 500–600 C, EuSis oxidized to a mixture of Eu3+-containing compounds (Eu3S4, Eu2O2S). In the range of 700–1000 C, onlyeuropium oxysulfate Eu2O2SO4 is formed. The structure refinement for Eu2O2SO4 was performed by theRietveld method. The luminescence intensity of europium oxysulfate Eu2O2SO4 with characteristic 4f-4ftransitions from the 5D0 state was investigated as a function of oxidation temperature.