ISSN:0370-1972    

DOI:10.1002/pssb.2221970136

出版商:WILEY‐VCH Verlag    

年代:1996

数据来源: WILEY

摘要:

AbstractCorrelations between the cohesive energy per mole and a crystallographic ratio in group‐II chalcodes are presented. It is shown that the linear combination of the anion radius and the nearest‐hbour distance is a constant in these materials. Results obtained agree with works reported earlier. This work highlights the significance of the anion radius in determining the cohesive energy in group‐II chalcoge

ISSN:0370-1972    

DOI:10.1002/pssb.2221970102

出版商:WILEY‐VCH Verlag    

年代:1996

数据来源: WILEY

ISSN:0370-1972    

DOI:10.1002/pssb.2221970137

出版商:WILEY‐VCH Verlag    

年代:1996

数据来源: WILEY

摘要:

AbstractThe extended X‐ray absorption fine structure (EXAFS) has been measured on the K edge of sulphur in Zn1−xMnxS solid solutions for various manganese contents (0 ±x± 0.4). Using the wellknown procedure of data reduction, we observed a weak linear increase of anion‐cation and anionanion distances for Mn concentrations changing from x = 0 to 0.4. On the basis of the simulation, using theoretical phases and amplitudes calculated by McKale, the possibility of peak separation in the Fourier transform both in the first and second shells has been di

ISSN:0370-1972    

DOI:10.1002/pssb.2221970103

出版商:WILEY‐VCH Verlag    

年代:1996

数据来源: WILEY

ISSN:0370-1972    

DOI:10.1002/pssb.2221970138

出版商:WILEY‐VCH Verlag    

年代:1996

数据来源: WILEY

摘要:

AbstractOne molar ratio of the compound AgI‐CsI has been taken for the ionic conductivity study. The activation energy has been obtained from the Arrhenius plot. The theory of Rice and Roth has been applied to calculate the number of potentially mobile ions of the conducting specie

ISSN:0370-1972    

DOI:10.1002/pssb.2221970104

出版商:WILEY‐VCH Verlag    

年代:1996

数据来源: WILEY

摘要:

AbstractThe generalized local Boltzmann equation is derived for the distribution function of energetic particles interacting with the thermal vibrations of the lattice. On using the Boltzman collision term the particle energy losses A(ϵ⊥) and the diffusion function B(ϵ⊥) are obtained. The functions A(ϵ⊥) and B(ϵ⊥) have singularities (fracture, peak) connected with the difference of the contributions of the particles moving in the regimes of channeling, quasichanneling, and ra

ISSN:0370-1972    

DOI:10.1002/pssb.2221970105

出版商:WILEY‐VCH Verlag    

年代:1996

数据来源: WILEY

摘要:

AbstractBy utilizing the Jahn‐Teller effect, we discuss the structural phase transition of BaTiO3crystals. By taking into account the simple model of the like‐hydrogen molecule‐ion (H 2+) and the effective point charge, we compute the structural paraelectrical‐ferroelectrical phase transition temperature Tcof BaTiO3. The theoretical value obtained is in good agreement with the experimenta

ISSN:0370-1972    

DOI:10.1002/pssb.2221970106

出版商:WILEY‐VCH Verlag    

年代:1996

数据来源: WILEY

摘要:

AbstractMaking the assumption that the value of the second Grüneisen parameter q is constant, we present a relation for the pressure dependence of the Grüneisen parameter y. The tests on four solids (NaCl, Li, Na, and K) show that the agreement between the calculated results given by the relation and the experimental data on the pressure dependence of y is excellent. A comparison between the linear relation suggested by Kumari and Dass and the relation presented in this paper demonstrates that the latter is bette

ISSN:0370-1972    

DOI:10.1002/pssb.2221970107

出版商:WILEY‐VCH Verlag    

年代:1996

数据来源: WILEY

摘要:

AbstractWe discuss the possibility that the critical behavior of the experimental random‐field Ising model may be interpreted as a constrained behavior. Emphasis is given to the problem of a first‐order phase transition which seems to be present in some experimental and theoretical resu

ISSN:0370-1972    

DOI:10.1002/pssb.2221970108

出版商:WILEY‐VCH Verlag    

年代:1996

数据来源: WILEY