Monoclinic high-pressure phase of AgGaS{sub 2}

Journal Article · Sat Feb 01 04:00:00 EST 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.55.2690· OSTI ID:450354

Kitahara, H; Ishizawa, N ^[1]; Marumo, F ^[2]; Noda, Y ^[3]

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1. Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226 (Japan)
2. Department of Geosciences, Nihon University, 3-25-40 Sakurajosui, Setagaya-ku, Tokyo 156 (Japan)
3. Department of Materials Science, Faculty of Engineering, Tohoku University, Aramaki, Aoba-ku, Sendai 980-77 (Japan)

Single-crystal x-ray diffraction study under high pressure has been carried out on AgGaS{sub 2} to obtain crystallographic information on the stable phase in the pressure range between 4.2 and 11.6 GPa. The high-pressure phase has monoclinic symmetry with space group Cc, a=8.065(4) {Angstrom}, b=8.039(1) {Angstrom}, c=6.226(3) {Angstrom}, and {beta}=128.50(3){degree} at 5.6 GPa. The monoclinic cell can be approximated as a pseudotetragonal cell of a{sub pt}=b{sub pt}=5.694 {Angstrom}, c{sub pt}=9.750 {Angstrom}, {alpha}{sub pt}={beta}{sub pt}=88.70{degree}, and {gamma}{sub pt}=89.82{degree} on the basis of the conventional chalcopyrite-type unit cell. The high-pressure phase is assumed to have a distorted chalcopyrite-type structure. The phase transition is reversible. A transformation twinning was observed in the high-pressure phase. The four possible twin components are related by the twofold axes present in the symmetry of the ambient-pressure phase. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 450354
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 5 Vol. 55; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BINARY MIXTURES
CRYSTAL STRUCTURE
GALLIUM SULFIDES
MONOCLINIC LATTICES
PHASE TRANSFORMATIONS
PRESSURE DEPENDENCE
SILVER SULFIDES
TWINNING
X-RAY DIFFRACTION