Pressure-induced transition in Rb[sub 31]WO[sub 3] as measured by XAFS

Conference · Sun Jul 10 04:00:00 EDT 1994 · AIP Conference Proceedings (American Institute of Physics); (United States)

OSTI ID:6916049

Houser, B ^[1]; Ingalls, R ^[2]

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1. Department of Physics, Eastern Washington University, Cheney, Washington 99004 (United States)
2. Department of Physics, University of Washington, Seattle, Washington 98195 (United States)

We have measured the x-ray absorption fine structure (XAFS) spectrum of the rubidium K and tungsten L[sub [ital III]]-edges in Rb[sub .31]WO[sub 3] as a function of pressure, carried out at the Stanford Synchrotron Radiation Laboratory. The low-pressure phase of rubidium tungsten bronze has a simple hexagonal structure, composed of layers of corner-linked WO[sub 6] octahedra, arranged in hexagonal rings, six to a ring. Each octahedron is common to two rings with each ring containing one Rb atom. The c-axis repeat length is the width of a single layer. We have obtained evidence of a pressure-induced structural phase transition in the vicinity of 2 GPa, which may be similar to the compressibility collapse transition in rhenium trioxide. Our proposed high-pressure phase remains hexagonal, with the c-axis repeat length spanning two layers, and the octahedra in successive layers tilting in opposite directions. [copyright] 1994 American Institute of Physics

• OSTI ID: 6916049
• Report Number(s): CONF-921145--
• Conference Information: Journal Name: AIP Conference Proceedings (American Institute of Physics); (United States) Journal Volume: 309:1
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
ALKALI METAL COMPOUNDS
AMBIENT TEMPERATURE
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
MEDIUM PRESSURE
PHASE TRANSFORMATIONS
PRESSURE DEPENDENCE
RUBIDIUM COMPOUNDS
RUBIDIUM TUNGSTATES
TUNGSTATES
VERY HIGH PRESSURE