Investigation of the disorder of Ga
            
              1−
              x
            
            Al
            
              x
            
            As mixed crystals. Part I: Small concentrations

The infrared spectra and powder X-ray diffraction patterns of polycrystalline YPO4-YCrO4 samples are studied from the point of view of their crystal symmetry. Mixed crystals of the D4h19 symmetry are formed over the region of 0-30 mol.% YPO4 in YCrO4. The Td → D2d → D2 or C2v(GS eff) correlation is appropriate for both PO43- and CrO43- anions.

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Vibration spectra of mixed crystals Sc(PO4, VO4) and Y(PO4, VO4)

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19821176 ◽

1982 ◽

Vol 47 (4) ◽

pp. 1176-1183 ◽

Cited By ~ 3

Author(s):

Alexander Muck ◽

Olga Smrčková ◽

Bohumil Hájek

Keyword(s):

Infrared Spectra ◽

Group Analysis ◽

Point Of View ◽

Mixed Crystals ◽

Site Symmetry ◽

Lattice Vibrations ◽

Vibration Spectra ◽

Space Group

Infrared spectra of mixed crystals Sc(PO4, VO4) and Y(PO4, VO4) have been studied from the point of view of group analysis. These systems form substitution mixed crystals in tetragonal space group D194h. The anions having proper symmetry Td or D2d in site symmetry D2d exhibit in spectra lowering of the site symmetry to effective C2 as a result of lattice vibrations of the type T(B2).

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Isomorphic Co-Crystallization of Ammonium and Rubidium Bromocarnallites

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19941815 ◽

1994 ◽

Vol 59 (8) ◽

pp. 1815-1819 ◽

Cited By ~ 5

Author(s):

Christomir Christov ◽

Christo Balarew ◽

Stefka Tepavitcharova

Keyword(s):

Distribution Coefficients ◽

Mixed Crystals ◽

Solubility Isotherm ◽

Continuous Series ◽

Liquid Phases

The solubility isotherm of the system NH4Br.MgBr2.6 H2O - RbBr.MgBr2.6 H2O - H2O has been investigated at 75 °C and formation of a continuous series of mixed crystals is established. The factors determining the values of the distribution coefficients of the components between the crystalline and liquid phases are discussed.

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Temperature and Pressure Variation of the Cl-NQR in A2PbCl6-Crystals

Zeitschrift für Naturforschung A ◽

10.1515/zna-1986-1-257 ◽

1986 ◽

Vol 41 (1-2) ◽

pp. 311-314 ◽

Cited By ~ 1

Author(s):

Y. M. Seo ◽

J. Pelzl ◽

C. Dimitropoulos

Keyword(s):

Relaxation Rate ◽

Room Temperature ◽

Lattice Relaxation ◽

Pressure Variation ◽

Mixed Crystals ◽

Spin Lattice Relaxation ◽

Structural Transitions ◽

Spin Lattice Relaxation Rate ◽

Spin Lattice ◽

Temperature And Pressure

The 35Cl NQR frequency and spin-lattice relaxation rate in the compounds A2PbCl6 (A = Cs, Rb, NH4, K) have been investigated in the range 4.2 K to 500 K, and as a function of pressure at room temperature. NQR experiments conducted on (K: NH4)2PbCl6 mixed crystals have been used to complete the NQR-frequency versus temperature diagram of K2PbCl6, revealing two structural transitions at Tc1 ≅ 358 K and at TC2 ≅ 333 K.

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