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1995 (2)
1992 (1)
1Author    V. Massarotti, D. Capsoni, M. BiniRequires cookie*
 Abstract    ta b ility o f (N i 1_ xL i x) (L i 1_ J,N iJ?) 0 2 O r d e r e d S o lid S o lu tio n The stability of ordered solid solutions (OSS) with LiNi02 structure has been studied in a wide range of the lithium cationic fraction (0.22 < xt < 0.42). The OSS is obtained from the reactive system Ni0/Li2C 03 at 800 °C starting with high nominal lithium content (xt = 0.5). By analysis of the decrease of x, observed after annealing, during which evaporation and a contact reaction occurs, structure-composition relationships can be obtained. The transformation of the ordered phase, due to a cation exchange process, is observed for xt < 0.31 by accurate X-Ray powder pattern analysis (Rietveld method). By increasing the annealing time (decreasing lithium content), the data can be explained on the basis of progressive formation of the simple solid solution (SSS) with only one cation site and halved c axis value. The variations of structural parameters during the transformation are compared with those reported in the litera­ ture. The coherence domains of the OSS become smaller and the phase percentage decreases, while the SSS percentage increases. The rate of such a process can be well described on the basis of a two dimensional diffusion mechanism. 
  Reference    Z. Naturforsch. 50a, 155—168 (1995); received November 21 1994 
  Published    1995 
  Keywords    Lithium Nickel Oxides, Solid state reaction, Solid solution, Order-Disorder Transfor­ mation 
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 TEI-XML for    default:Reihe_A/50/ZNA-1995-50a-0155.pdf 
 Identifier    ZNA-1995-50a-0155 
 Volume    50 
2Author    A. M. Raevsky, G. K. Semin, T. L. KhotsyanovaRequires cookie*
 Title    3 5 C I N Q  
 Abstract    R o f I m p u r ity M o le c u le s o f T e tra c h lo r id e s o f G ro u p IV E le m e n ts in M a t r i x C r y s ta ls o f G ro u p I V E le m e n t H a lid e s 35C1 NQR spectra of the impurity molecules E'C14 (1.5-5% mol) (E' = C, Si, Ge, Sn) in the matrix crystals of Group IV tetrachlorides EC14 (E = Si, Ge, Sn, Ti) have been measured at 77 K. The mixtures of the above components are substitution solid solutions. Changes in the 35C1 NQR spectra of the impurity molecules have been analysed as to packing factors and nearest environment. 
  Reference    Z. Naturforsch. 50a, 606—610 (1995); received December 8 1994 
  Published    1995 
  Keywords    NQR, 35C1, solid solutions, tetrachlorides of Group IV elements 
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 TEI-XML for    default:Reihe_A/50/ZNA-1995-50a-0606.pdf 
 Identifier    ZNA-1995-50a-0606 
 Volume    50 
3Author    G. K. Semin, A. M. Raevsky, S. I. Kuznetsov, T. L. Khotsyanova, S. I. GushchinRequires cookie*
 Title    Br NQR Spectra of the Impurity Molecules of Tetrabromides of Group IV Elements in the Matrix Crystals of Group IV Element Halides  
 Abstract    Changes in 79 Br NQR spectra of the impurity molecules EBr4 (2-5% mol) (E = C, Si, Ti, Ge, Sn) in the matrix crystals of group IV element tetrahalides EHal4 (E = Si. Ti, Ge, Sn; Hal = CI, Br) were studied at 77 K. The mixtures of these components are substitution solid solutions (SS), which was proved by the appearance of characteristic satellites in the NQR spectra of the matrix crystals. Changes in the Br NQR spectra of the impurity molecules were analyzed from the viewpoint of packing factors and the type of nearest environment. In the temperature range 77-270 K an abnormal temperature dependence of the 79 Br NQR frequencies of TiBr4 impurity in SiBr4 matrix was observed for both lines of the cubic phase. The temperature dependence of the 79 Br NQR frequencies of SiBr impurity in TiBr4 matrix is normal. 
  Reference    Z. Naturforsch. 47a, 111—116 (1992); received December 18 1991 
  Published    1992 
  Keywords    79, 81 Br NQR, Solid solutions, Group IV element tetrahalides, Temperature depen-dence of NQR frequencies 
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 TEI-XML for    default:Reihe_A/47/ZNA-1992-47a-0111.pdf 
 Identifier    ZNA-1992-47a-0111 
 Volume    47