Hassel Ledbetter
Professor Adjunct
Hassel.Ledbetter@colorado.edu
Education
- Ph.D., Materials Science, University of Illinois (Urbana), 1969
Professional Recognition
- Visiting professor, University of Tsukuba (Japan), one year
- Visiting professor, University of Stuttgart (Germany), three months
- Visiting scientist, Institute of Metrology (Japan), three months
- Visiting scientist, Max Planck Institut fuer Metallforschung (Stuttgart, Germany), many visits for one—three months
- Visiting lecturer, Osaka University (Japan)
- US Department of Commerce silver medal
Research Interests
- Solid-state elastic constants, measurement and theory, especially at low temperatures
- Relationships of elastic constants to other basic physical properties such as thermal expansivity, specific heat, Debye temperature, Grüneisen parameter
- Phase transformations, especially martensite crystallography
Selected Publications
- Martensite crystallography of the δ—α-plutonium phase transformation, in (ICOMAT-08, TMS, Warrendale, forthcoming).
- Osmium's bulk modulus, Physical Review B, forthcoming, with C. Pantea, I. Mihut, A. Migliori, et al.
- Elastic-constant systematics in f.c.c. metals, including lanthanides—actinides, Physica Status Solidi (b) Basic Research, 245 (2008) 44, with A. Migliori.
- Osmium's Debye temperature, Journal of Physics and Chemistry of Solids, 69 (2008) 211, with C. Pantea, I. Mihut, A. Migliori.
- Elastic constants, Blackman diagrams, and new actinide—lanthanide insights, POMA, 1 (2007) 1.
- Alpha-plutonium's polycrystalline elastic constants over its full temperature range, Journal of the Acoustical Society of America, 122 (2007) 1994, with Migliori, C. Pantea, et al.
- Elastic constants of monocrystal iron from 3 to 500 K, Journal of Applied Physics 100, 11530 (2006), with J. Adams, D. Agosta, R. Leisure.
- Sound velocities, elastic constants: Temperature dependence, Materials Science and Engineering A 442, 31 (2006).
- Unexpected elastic softening in δ-plutonium, Physical Review B 73, 052101 (2006), with A. Migliori, A. Lawson, et al.
- Pressure-induced elastic softening of monocrystalline zirconium tungstate at 300 K, Physical Review B 73, 214118 (2006), with C. Pantea, A. Migliori, P. Littlewood, et al.
- Elastic, anelastic, and piezoelectric coefficients of α-quartz determined by resonance ultrasound spectroscopy, Journal of Applied Physics 100, 053511 (2006), with H. Ogi, M. Hirao, et al.
- A general elastic-anisotropy measure, Journal of Applied Physics 100, 063516 (2006), with A. Migliori.
- Invar model for δ-phase Pu: thermal expansion, elastic, and magnetic Properties, Philosophical Magazine 86, 2713 (2006), with A. Lawson, J. Roberts, et al.
- Free-energy density of the shape-memory alloy AuZn, JIM Materials Transactions 47, 587 (2006) (invited), with J. Lashley, T. Darling, et al.