Physica Status Solidi (B) Basic Solid State Physics

Ariponnammal, S.; Venkateswaran, C.; Natarajan, S.

doi: 10.1002/pssb.2221970136pmid: N/A

doi: 10.1002/pssb.2221970101pmid: N/A

Kumala, W.; Gonczarek, R.

doi: 10.1002/pssb.2221970138pmid: N/A

Solecki, J.; Kasperczyk, J.; Kityk, I. V.; Napieralski, J.; Czerwinski, M.

doi: 10.1002/pssb.2221970137pmid: N/A

Koh, A. K.

doi: 10.1002/pssb.2221970102pmid: N/A

Correlations 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 chalcogenides.

Łażewski, J.; Zimnal‐Starnawska, M.; Kisiel, A.; Boschbrini, F.; Pascarelli, S.; Giriat, W.

doi: 10.1002/pssb.2221970103pmid: N/A

The 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 discussed.

Nalini, B.; Selvasekarapandian, S.; Janaki, K.

doi: 10.1002/pssb.2221970104pmid: N/A

One 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 species.

Kashlev, Yu. A.; Sadykov, N. M.

doi: 10.1002/pssb.2221970105pmid: N/A

The 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 random motion.

Zhang, Duan‐Ming; Yu, Bo‐Ming; Li, Yuan; Zhang, Xin‐Yu; Lai, Jian‐Jun; Li, Hua

doi: 10.1002/pssb.2221970106pmid: N/A

By utilizing the Jahn‐Teller effect, we discuss the structural phase transition of BaTiO3 crystals. 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 Tc of BaTiO3. The theoretical value obtained is in good agreement with the experimental results.

Fang, Zheng‐Hua

doi: 10.1002/pssb.2221970107pmid: N/A

Making 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 better.