Structure and photoinduced structural changes in [ital a]-As[sub 2]S[sub 3] films: A study by differential anomalous x-ray scattering

Journal Article · Fri Jan 01 00:00:00 EST 1993 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.47.686· OSTI ID:7001560

Zhou, W; Sayers, D E; Paesler, M A ^[1]; Bouchet-Fabre, B; Ma, Q; Raoux, D ^[2]

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1. Department of Physics, North Carolina State University, Raleigh, North Carolina 27695 (United States)
2. Laboratoire pour l'Utilisation du Rayonnement Electromagnetique (LURE), Batiment 209D, Universite de (Paris)emSud, 91405 Orsay CEDEX (France)

Differential anomalous x-ray-scattering experiments were carried out on two samples, annealed and photodarkened [ital a]-As[sub 2]S[sub 3] films of 4 [mu]m in thickness. Two x-ray energies were chosen. One is 11 859 eV, just below the arsenic [ital K] edge; the other is 11 700 eV, below the edge by 167 eV. The study of the Structure and photoinduced reversible structural changes in the [ital a]-As[sub 2]S[sub 3] films show that the first sharp diffraction peak (FSDP) is related to intermediate-range correlations. These correlations extend as far as 7.0 A. Beyond 7.0 A, however, the structure in radial distribution function tends to the average atomic density. The FSDP is dominated by the arsenic-related atomic correlations, especially As-As atomic correlation. After photodarkening, the structure overall in both the short and intermediate ranges moves to a more disordered state. The photoinduced structural changes involve changes of the As-As atomic pair correlation in the intermediate range as illustrated by the comparisons of the changes between the annealed and photodarkened [ital a]-As[sub 2]S[sub 3] films in the FSDP's and the differential structure factors.

• DOE Contract Number: FG05-89ER45384
• OSTI ID: 7001560
• Journal Information: Physical Review, B: Condensed Matter; (United States), Vol. 47:2; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ARSENIC SULFIDES
MICROSTRUCTURE
AMORPHOUS STATE
CORRELATION FUNCTIONS
STRUCTURE FACTORS
THIN FILMS
X-RAY DIFFRACTION
ARSENIC COMPOUNDS
CHALCOGENIDES
COHERENT SCATTERING
CRYSTAL STRUCTURE
DIFFRACTION
FILMS
FUNCTIONS
SCATTERING
SULFIDES
SULFUR COMPOUNDS
360602* - Other Materials- Structure & Phase Studies