Ternary sulfides BaPrCuS3 and BaSmCuS3 are first synthesized by the sulphidation reaction of a mixture of related oxides and metal Cu in a flow of (CS2, H2S) at 1170 K. The crystal structures of BaPrCuS3 and BaSmCuS3 are obtained by Rietveld method. BaPrCuS3 crystallizes in space group
A technique is proposed to observe effects of acoustic waves in piezoelectric crystals by differential Raman spectroscopy. Anisotropic deformations induced by acoustic waves are shown to change crystal symmetry and result in redistribution of lines' intensity and new Raman lines appearance. Such effects in KDP and a-quartz crystals are presented as examples.
This work is devoted to the complex research on temperature phase transitions in a CsScF 4 crystal. The crystal structure was solved and refined at different temperatures by using the Rietveld method. Structural phase transitions were investigated by using the following spectroscopic methods, some of them for the first time: Brillouin spectroscopy, Raman spectroscopy, IR absorption spectroscopy and NMR. The symmetry analysis of the Brillouin zone center of all phases is presented. The vibrational spectra of the crystal in three phases have been calculated. The structural phase transition mechanism was determined. The transitions at T 1 = 475 K and T 2 = 317.5 K are of displacement type. The Raman soft modes have been associated with rotations of the ScF 6 octahedral group.8472 | CrystEngComm, 2016, 18, 8472-8486This journal is
Cs 2NaBi(MoO4)3. -Single crystals of Cs2NaBi(MoO4)3 are grown by annealing (673-773 K, 60 h) of a mixture of Na 2MoO4 (obtained via calcination of the hydrate), Cs2MoO4 (obtained by annealing Cs2CO3 and MoO3, 823 K, 60 h), and Bi2(MoO4)3 (obtained by reacting Bi 2O3 and MoO3, 723-773 K, 50 h). The compound crystallizes in the noncentrosymmetric trigonal space group R3c (Z = 12, single crystal XRD) in anisotropic approximation for all atoms taking into account racemic twinning. The structure is completely ordered with Mo tetrahedrally coordinated, Bi in octahedral, and Na in distorted trigonal prismatic coordination. Cs(1) and Cs (2) reside in the framework cavities with coordination numbers 12 and 10, respectively. No phase transitions are found in Cs 2NaBi(MoO4)3 up to the melting point at 826 K. The compound shows an SHG signal of I 2w/I2w(SiO2) = 5. Raman spectroscopic data are also given. -(SAVINA, A. A.; ATUCHIN*, V. V.; SOLODOVNIKOV, S. F.; SOLODOVNIKOVA, Z. A.; KRYLOV, A. S.; MAXIMOVSKIY, E. A.; MOLOKEEV, M. S.; ORESHONKOV, A. S.; PUGACHEV, A. M.; KHAIKINA, E. G.; J. Solid State Chem. 225 (2015) 53-58, http://dx.
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