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Lattice vibrational modes in potassium thiocyanate
Vol. 36, No. 12 8.
ABSTRACTS OF ARTICLES TO BE PUBHSHED IN THE J. PHYS. CHEM. SOLIDS
LATrlCE VIBRATIONAL MODES IN POTASSIUM THIOCYANATE H. Kanamori, H. Okamoto and K. Urabe, Department of Electrical Engineering,Kyoto Technical University, Matsugasaki,Sakyo-ku, Kyoto 606, Japan
tude of the chemical shifts between the observed and calculated values has been obtained. Received 3 December 1979 Revised 24 June 1980
11.
Calculationson long-wavelengthlatticevibrations have been made for crystallineNCS with the framework of the rigidion model. The short range force constants and effectivecharges of the ions have been determined from the observed frequencies.Unobserved frequencies are predicted,and normal coordinateshave been obtained and schematized. Received 10 March 1980 Revised 13 June 1980
9.
SUPERCONDUCTIVITY AND THE b.c.c. TO A-15 TRANSFORMATION IN Nb- Au ALLOYS M.S. Wire and G.W. Webb, Institute for Pure and Applied Phys!cal Sciences, University of California, San Diego, La JoUa, CA 92093, U.S.A.
Nb-Au alloys near the composition Nb~Au can be quenched from the high temperature a solid solution phase field, retaining the b.c.c, structure. We report results on their superconducting, mechanical and physical properties as a function of composition. Short low temperature anneals transform these materials to the equilibrium A-I 5 structure with Tc up to 11 K. We report results on the superconducting and physical properties of the transformed A-15 structure materials and describe how the properties of the transformed materials are affected by annealing temperature and time. Received 19 May 1980
10.
CHEMICAL SHIFTS OF X-RAY K OR LABSORPTION EDGES OF SOLIDS K.S. Srivastava and V. Kumar, Physics Department, Lucknow University, Lucknow226007, (U.P.) India
A very simple method for the calculation of the chemical shifts of X-ray K or L-absorption edges of metals when they undergo chemical combination, is proposed. It has been found that the major contribution to the chemical shifts comes from the change in the Fermi energy when the metal forms a compound. Fairly ~d agreement in the nature and the numerical magni- -
iii
AN EXPERIMENTAL INVESTIGATION OF THE PHOTOCONDUCTIVITY SPECTRUM OF A MONOCRYSTAL OF AgInS2 GROWN BY BRIDGMAN AND CHEMICAL TRANSPORT TECHNIQUES N.V. Joshi, L. Martinez and R. Echeverria, Dcpartamento de Fisica, Universidad de Los Andes, Mdrida, Venezuela.
The photoconductivity spectrum of a AglnS2 single crystal grown both by chemical transport and by the Bridgman method has been studied at 300 K. Splitting of the valence band was clearly observed in both the chalcopyrite and pseudo-wurtzite structures. The observed splitting is in reasonable agreement with the values reported by the electroreflection technique. Received 12 May 1980
12.
CHLORIDE SPINELS: A NEW GROUP OF SOLID LITItlUM ELECTROLYTES H.D. Lutz, W. Schmidt and H. Haeuseler, Universit~t Siegen, Laboratorium ftir Anorganische Chemic, D-5900 Siegen 21, Germany
The chloride spinels Li2MCI4 with M = Mg, Mn, Fe, and Cd show very high lithium ionic conductivity in the solid state. The ionic conductivity in the compounds under investigation was established with the help of e.m.f, measurements. The specific con'luctivities measured by both frequency response analysis and the four probe a.c. method are 1.3 ~-t cm-t for Li2CdCI4, and about 0.9 ~ - t cm-t for Li2MnCI4, Li2MgCLt, and Li2FeCl4 at 773 K. There are several indications that the ternary chlorides become highly disordered at elevated temperatures. Thus the Arrhenius plots, i.e. In o • Tvs l/T-curves, exhibit significant bends, the slopes below the transition temperature being considerably higher than those above. Received 14 April 1980
13.
ELECTRON SCATTERING IN CdxHgs_,Te J..l'. Dubowski, T. Dietl, W. Szymaflska and R.R. Ga~lzka, Institute of Physics, Perish Academy of Sciences, Al. Lomik6w 32146, 02-668 Warszawa, Poland
Experimental studies of the electron mobility in CdxHgt_=Te (0 ~ x ~ 0.33, lOtScm-3 -.
ABSTRACTS OF ARTICLES TO BE PUBHSHED IN THE J. PHYS. CHEM. SOLIDS
LATrlCE VIBRATIONAL MODES IN POTASSIUM THIOCYANATE H. Kanamori, H. Okamoto and K. Urabe, Department of Electrical Engineering,Kyoto Technical University, Matsugasaki,Sakyo-ku, Kyoto 606, Japan
tude of the chemical shifts between the observed and calculated values has been obtained. Received 3 December 1979 Revised 24 June 1980
11.
Calculationson long-wavelengthlatticevibrations have been made for crystallineNCS with the framework of the rigidion model. The short range force constants and effectivecharges of the ions have been determined from the observed frequencies.Unobserved frequencies are predicted,and normal coordinateshave been obtained and schematized. Received 10 March 1980 Revised 13 June 1980
9.
SUPERCONDUCTIVITY AND THE b.c.c. TO A-15 TRANSFORMATION IN Nb- Au ALLOYS M.S. Wire and G.W. Webb, Institute for Pure and Applied Phys!cal Sciences, University of California, San Diego, La JoUa, CA 92093, U.S.A.
Nb-Au alloys near the composition Nb~Au can be quenched from the high temperature a solid solution phase field, retaining the b.c.c, structure. We report results on their superconducting, mechanical and physical properties as a function of composition. Short low temperature anneals transform these materials to the equilibrium A-I 5 structure with Tc up to 11 K. We report results on the superconducting and physical properties of the transformed A-15 structure materials and describe how the properties of the transformed materials are affected by annealing temperature and time. Received 19 May 1980
10.
CHEMICAL SHIFTS OF X-RAY K OR LABSORPTION EDGES OF SOLIDS K.S. Srivastava and V. Kumar, Physics Department, Lucknow University, Lucknow226007, (U.P.) India
A very simple method for the calculation of the chemical shifts of X-ray K or L-absorption edges of metals when they undergo chemical combination, is proposed. It has been found that the major contribution to the chemical shifts comes from the change in the Fermi energy when the metal forms a compound. Fairly ~d agreement in the nature and the numerical magni- -
iii
AN EXPERIMENTAL INVESTIGATION OF THE PHOTOCONDUCTIVITY SPECTRUM OF A MONOCRYSTAL OF AgInS2 GROWN BY BRIDGMAN AND CHEMICAL TRANSPORT TECHNIQUES N.V. Joshi, L. Martinez and R. Echeverria, Dcpartamento de Fisica, Universidad de Los Andes, Mdrida, Venezuela.
The photoconductivity spectrum of a AglnS2 single crystal grown both by chemical transport and by the Bridgman method has been studied at 300 K. Splitting of the valence band was clearly observed in both the chalcopyrite and pseudo-wurtzite structures. The observed splitting is in reasonable agreement with the values reported by the electroreflection technique. Received 12 May 1980
12.
CHLORIDE SPINELS: A NEW GROUP OF SOLID LITItlUM ELECTROLYTES H.D. Lutz, W. Schmidt and H. Haeuseler, Universit~t Siegen, Laboratorium ftir Anorganische Chemic, D-5900 Siegen 21, Germany
The chloride spinels Li2MCI4 with M = Mg, Mn, Fe, and Cd show very high lithium ionic conductivity in the solid state. The ionic conductivity in the compounds under investigation was established with the help of e.m.f, measurements. The specific con'luctivities measured by both frequency response analysis and the four probe a.c. method are 1.3 ~-t cm-t for Li2CdCI4, and about 0.9 ~ - t cm-t for Li2MnCI4, Li2MgCLt, and Li2FeCl4 at 773 K. There are several indications that the ternary chlorides become highly disordered at elevated temperatures. Thus the Arrhenius plots, i.e. In o • Tvs l/T-curves, exhibit significant bends, the slopes below the transition temperature being considerably higher than those above. Received 14 April 1980
13.
ELECTRON SCATTERING IN CdxHgs_,Te J..l'. Dubowski, T. Dietl, W. Szymaflska and R.R. Ga~lzka, Institute of Physics, Perish Academy of Sciences, Al. Lomik6w 32146, 02-668 Warszawa, Poland
Experimental studies of the electron mobility in CdxHgt_=Te (0 ~ x ~ 0.33, lOtScm-3 -.