The High Pressure Laboratory in the UW Physics Department

High Pressure Laboratory Homepage

High Pressure Studies - Robert Ingalls, Professor Emeritus

Very high pressures are used to vary the crystal, magnetic, electronic, and vibrational structure of materials. These effects are observed by synchrotron X-ray absorption spectroscopy (XAFS) and recoilless gamma-ray spectroscopy (Mossbauer effect). The X-ray experiments are primarily conducted off campus at national synchrotron facilities such as the Stanford Synchrotron Radiation Laboratory, and Advanced Photon Source, while the gamma-ray work uses Mossbauer spectrometers in Professor Ingalls' High Pressure laboratory here in the Physics Department. The high pressures are generated using the opposed anvil technique such as with the diamond anvil cell, which is capable of pressures of several hundred gigapascals. Experimental systems studied are pure metals and metal halides, perovskites, mixed-valent materials, amorphous systems, high temperature superconductors and materials of geological significance.

Recent Publications

"X-ray Absorption Fine Structure Determination of Pressure Induced Bond Angle Changes in ReO(3)," B. Houser and R. Ingalls, Phys. Rev. B61, 6515 (2000).
"Pressure-Induced Bond Buckling in YBa(2)Cu(3)O(7-x)," A. Sahiner, E. D. Crozier, D. T. Jiang and R. Ingalls, Phys. Rev. B59, 3902 (1999).
"X-ray Absorption Fine Structure Study of the B1 to B2 Phase Transition in RbCl," S. Kelly, R. Ingalls, F. M. Wang, B. Ravel and D. Haskel, Phys. Rev. B57, 7543 (1998).
"Iron bcc-hcp Transition: Local Structure from X-ray Absorption Fine Structure," F. M. Wang and R. Ingalls, Phys. Rev. B57, 5647 (1998).
"Local Structural Changes in KNbO(3) under High Pressure," A.I. Frenkel, F.M. Wang, S. Kelly, R. Ingalls, D. Haskel, E.A. Stern and Y. Yacoby, Phys. Rev. B56, 10,869 (1997).
"The Effect of Hydrostatic Pressure on the Local Structure of K(1-x)Na(x)TaO(3) and KTa(1-x)Nb(x)O(3)," F. Wang, B. Ravel, Y. Yacoby and E.A. Stern) and R. Ingalls, J. de Phys. IV, Vol. 7, C2-1225 (1997).
"Electronic Structure of RbBr under Phase Transition: X-ray Absorption Near Edge Structure Analysis," A.V. Soldatov, I.E. Stekhin and R. Ingalls, J. Phys.: Condens. Matter, Vol.8, 7829 (1996)
"XAFS Study of ReO(3) under Pressure", B. Houser, R. Ingalls and J.J. Rehr, Physica B Vol. 208 & 209, 323 (1995).
"The Valence of Samarium in the Mixed-Valence Transition in SmSe," K.R. Bauchspiess, E.D. Crozier and R. Ingalls, Jpn. J. Appl. Phys. Vol.32, Suppl. 32-2, 752 (1993).

Recent PhD Theses

"XAFS Study of the Pressure Induced B1-B2 Phase Transition," Shelly Kelly, 1999
"XAFS Studies of Solid-Solid Phase Transformations at High Pressures," Fuming Wang, 1998
"High Pressure Studies of Iron Hydroxide, Iron Silicate Spinel and Sodium Nitroprusside," In-Jerng Choe, 1994
"EXAFS" Experiments at High Pressure with Small Samples," John Whitmore, 1994
"X-Ray Absorption Fine-Structure of Solids under High Pressure," Jurgen Freund, 1990
"Study of Bond Angle Determination by XAFS using the Seprable Spherical Wave Approximation," Brian Houser, 1990

Addresses

Location: B228 in Physics and Astronomy Building

Lab Phone: (206) 543-7543

Dr.Ingalls's Phone: (206) 543-2778

FAX: (206) 543-9523

EMAIL: ingalls@dirac.phys.washington.edu

US Mail: Physics Dept., Box 351560, University of Washington, Seattle, WA 98195-1560

Experimental Condensed Mater Physics at the University of Washington

Research in the High Pressure Lab is funded by US Dept. of Energy.