Thermal properties of ${Eu}_{3}$ $S_{4}$ : Order-disorder transition

Publisher Website

1 January 1983

journal article
research article
Published by American Physical Society (APS) in Physical Review B

Vol. 27 (1) , 359-363
https://doi.org/10.1103/physrevb.27.359

Abstract

Capacitive thermal-expansion, specific-heat, and electrical-resistivity measurements on single crystals of

{Eu}_{3}

S_{4}

and

{La}_{3}

S_{4}

have established for

{Eu}_{3}

S_{4}

a first-order, nonstructural phase transition near

T_{t} = 186

K and the entropy change

Δ S = 9 \pm 0.9

J/moleK of an order-disorder transition with a configurational entropy

R \ln 3

. The transition exhibits

\frac{Δ V}{V} = 9 \times 10^{- 4}

and

\frac{d \ln T_{t}}{dp} = \frac{d \ln E_{a}}{dp} = - 8.7 \times 10^{- 11}

{Pa}^{- 1}

, i.e., a proportionality between

T_{t}

and the activation energy

E_{a}

of the resistivity.

Keywords

This publication has 20 references indexed in Scilit:

Some questions on charge ordering in Th₃P₄-type mixed-valence rare-earth compounds
Philosophical Magazine Part B, 1980
The verwey transition
Philosophical Magazine Part B, 1980
Theory of mixed valence: Metals or small gap insulators (invited)
Journal of Applied Physics, 1979
An automated calorimeter for the temperature range 80-320K without the use of a computer
Journal of Physics E: Scientific Instruments, 1979
Spatial correlations of rare-earth ions in mixed-valence systems
Solid State Communications, 1978
PHASE TRANSITION AND MAGNETISM IN Eu₃S₄
Le Journal de Physique Colloques, 1976
Vacancy and charge ordering in the Th3P4 related structures
Journal of Solid State Chemistry, 1972
Observation of a phase transformation in Eu3S4 at 168°K
Journal of the Less Common Metals, 1970
Study of Electron Hopping in Eu3S4 by Combined Electrical Conductivity and Thermal EMF Measurements
Journal of Applied Physics, 1970
Observation of electron hopping in 151Eu3S4 by Mössbauer spectroscopy
Solid State Communications, 1968