Ordering in alloy Cu3Au - IV

Solid State Communications

Abstracts

Vol. 2, pp. viii-xii,

1964. Pergamon

Press,

Inc. Printed

in the United States,

of Articles to be Published in the Journal of the Physics and Chemistry of Solids “J. Phys. Chem. Solids (to be published)”

should be cited in references to material quoted from this section prior to the publication of the relevant article.

H. Stern (Facultd des Sciences, Libre de Bruxelles, Bruxelles,

1. g-VALUE OF Fe+++ IN II-VI CUBIC CRYSTALS. § Hiroshi Watanabe (Department of Nuclear Engineering, The University of Michigan, AM Arbor, Michigan, U. S. A. ).

A theoretical study is made of the effect of the spin-phonon interaction of the thermal conductivity of a magnetic substance at temperatures in the neighborhood of the magnetic transition. It is shown that the thermal conductivity exhibits an anomalous dip, as has been observed, and the relationship between this anomaly and that of the specific heat is found.

A theory of the g-shift is developed of Fe+++ in II-VI cubic crystals. Electron-transfer through spin-orbit interaction to Fe+++ from the surronding ligands is shown to be a reasonable mechanism for the observed positive gshift in MgO, CaO and ZnS.

(Received (Received

‘7 February

4. HIGH TEMPERATURE HOLE CONDUCTIVITY IN SILVER BROMIDE. D. 0. Raleigh (North American Aviation Science Center, Thousand Oaks, California, U. S. A. ). The specific hole conductivity of AgBr in equilibrium with Br2 gas at 1 atm. has been determined in the range 177-4150, using the polarized conductivity cell C, Bra(g) 1AgBr(s) 1(C or Pt). The hole conductivit rises to a maximum of 9.4 x 10-4 ohm-l ‘cm- P at about 3600 and decreases with further temperature increases. Its half-power dependence on the Br2 pressure was verified at temperatures up to the AgBr melting point. Available Hall mobility and low-temperature hole conduction data were used in to derive a log (hole concn. ) vs. l/T plot, which is linear in the range 85-3150, with a 10.1 kcal/mole slope. Available electronic conductivity and mobility data were used to calculate an np product in the range 310-3720, which is consistent with a temperature dependent bandgap of EG (eV) = 3.2 - (1.8 x 10_3)T(oK) in this range.

The effect of annealing above the Curie point and of neutron irradiation was investigated on the ordering processes of the alloy Cu3Au. It has been found that the temperature of disordering does not influence the first process, but it changes the rate of the second process without, however, modifying its mechanism. The neutron irradiation changes the first process as well as the second one. The results of these investigations are material in understanding the process of antiphase domain wall movement, as well as the role of vacancies in the establishment of order,

3. THERMAL CONDUCTMTY NETIC TRANSITION.

30 March 1964)

1964)

2. ORDERING IN ALLOY Cu3Au - IV. I. Nag-y (Central Research Institute for Physics, Hungarian Academy of Sciences, Budapest, Hungary).

(Received

Universite Belgium).

28 February

1964)

AT THE MAG-

(Received 8 This work is supported in part by a grant from the National Aeronautics and Space Administration.

13 April 1964)

5. THE FERMI SURFACE OF ANTIMONY FROM viii