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 04:00:00 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), Journal Name: Modern Physics Letters B; (Singapore) Vol. 6:23; ISSN 0217-9849; ISSN MPLBET
• Country of Publication: United States
• Language: English

Related Subjects

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