EXAFS studies of the ferroelectric phase transitions induced by off-center ions in PBS[sub x]Te[sub 1[minus]x] and Zn[sub x]Cd[sub 1[minus]x] Te alloy

Journal Article · Sat Oct 10 00:00:00 EDT 1992 · Modern Physics Letters B; (Singapore)

DOI:https://doi.org/10.1142/S0217984992001125· OSTI ID:6857623

Wang, Z; Bunker, B A; Mayanovic, R A; Debska, U; Furdyna, J K ^[1]; Islam, Q ^[2]

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1. Notre Dame Univ., IN (United States). Dept. of Physics
2. Dept. of Physics, Marquette Univ., Milwaukee, WI (United States)

In this paper using the Extended X-ray Absorption Fine Structure (EXAFS) technique, the authors investigated the local structure of disordered PbS[sub x]Te[sub 1 [minus] x] and Zn[sub x]Cd[sub 1 [minus] x]Te alloys at temperatures below and above the reported ferroelectric transition temperatures. For the PbS[sub x]TE[sub 1 [minus] x] alloys ( x = 0.10, 0.19, and 0.30), the sulphur ions are found to be off-center in both the high and the low temperature phase and Pb sublattice and Te sublattice shift relative to one another below the transition temperature. For Zn[sub x]Cd[sub 1 [minus] x]Te alloys (x = 0.10 and 0.20), the zinc ions are found in a slightly asymmetric site in the cages formed by four NN Te ions and no relative shift between the cation and anion sublattice is observed. The authors discuss our results concerning the ferroelectric phase transitions (FPT) induced by off-center ions in these two systems.

• OSTI ID: 6857623
• Journal Information: Modern Physics Letters B; (Singapore), Vol. 6:23; ISSN 0217-9849
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CADMIUM TELLURIDES
PHASE TRANSFORMATIONS
LEAD SULFIDES
LEAD TELLURIDES
ZINC TELLURIDES
ABSORPTION SPECTRA
ASYMMETRY
FINE STRUCTURE
LEAD
RANDOMNESS
SULFUR IONS
TELLURIUM
TERNARY ALLOY SYSTEMS
X-RAY SPECTRA
ZINC IONS
ALLOY SYSTEMS
CADMIUM COMPOUNDS
CHALCOGENIDES
CHARGED PARTICLES
ELEMENTS
IONS
LEAD COMPOUNDS
METALS
SEMIMETALS
SPECTRA
SULFIDES
SULFUR COMPOUNDS
TELLURIDES
TELLURIUM COMPOUNDS
ZINC COMPOUNDS
360606* - Other Materials- Physical Properties- (1992-)