Profile of John R. Hardy
John R. Hardy
George Holmes Distinguished Professor of Physics and Astronomy at the University of Nebraska Linkoln, Adjunct Professor of Physics at the University of Nebraska at Omaha
(402) 472-2772
e-mail: jhardy@unl.edu
![[ Click here for a picture ]](./jrh.gif)
- Ph.D., Bristol University, England, 1959
- B.Sc., Bristol University, England, 1956
Professor Hardy joined UNL in 1966 as a Visiting Associate Professor of
Physics. He was an Associate Professor of Physics through 1967 and became a
full Professor in 1968. He was a Visiting Scientist at the Lawrence
Livermore Lab during the spring of 1976 and 1977. Dr. Hardy is
recognized nationally and internationally for his pioneering work in the
lattice dynamics and statics of crystalline materials. He was the
originator of the ``deformation dipole'' model widely used in
calculations of the properties of both pure materials and materials containing
defects and he has worked extensively on the theory of shock propagation of
condensed matter.
Research Interests:
Lattice Dynamics of Perfect and Imperfect Alkali Halides; Point Defect
Studies in Alkali Halides and Metals, Theory of Ferroelectricity, Shock
Dynamics of Solids and Superconductivity.
Current Research Projects:
- Microwave Optics of Ionic Solids: Theory and Experiment (ARO).
- Structural Instabilities in Complex Ionic Solids (ARO/EPSCoR).
- Numerical Studies in Two Fluid Mixing (EG&G).
- Theoretical Studies on the Origins of Ferroelectricity (ONR).
Selected Publications:
- H.M. Lu, R. Qi, and J.R. Hardy, "A Priori Prediction of the
Order-Disorder Phase Transition in NaNO2," Solid State Comm., 87,
No. 12, pp. 1151-1154, (1993).
- H.M. Lu, J.R. Hardy, H.Z. Cao and W.M. Mei, "First Principles
Theory of Phase Transitions and Incommensurate Behavior in A2BX4 Compounds,"
Ferroelectrics, 155, pp. 251-256 (1994).
- H.M. Lu, J.R. Hardy, H.Z. Cao and W.M. Mei, "Double-Well Potential
Energy Surfaces in Cs2CdBr4 and Cs2ZnI4," Ferroelectrics, 155, pp. 245-249
(1994).
- J.W. Flocken and J.R. Hardy, "A Study of the Structure and Stability
of SrCuO2," Ferroelectrics, 153, pp. 79-84 (1994).
- J.W. Flocken, J.R. Hardy and Z. Mo, "Molecular Dynamics Simulation
of the Phase Transition in LaAlO3," Ferroelectrics, 153, pp. 73-78
(1994).
- Z. Mo, J.W. Flocken, D.M. Hatch and J.R. Hardy, "Molecular
Dynamics Simulation of BaMgF4 and BaMnF4," Ferroelectrics, 153,
pp. 67-72 (1994).
- J.W. Flocken, Z. Mo, W.N. Mei, J.R. Hardy and D.M. Hatch, "Molecular
Dynamics Simulation of Some BaXF4," Phys. Rev. B, 5811 (1994).
- V. Katkanant and J.R. Hardy, "Lattice- and Molecular-Dynamics
Studies of RbLiSO4," Phy. Rev. B, 51, pp. 137-145 (1995).
- V. Katkanant and J.R. Hardy, "Molecular Dynamics Simulation of
Phase Transitions in RbLiSO4," Phy. Rev. B (in press).
- H.Z. Cao and J.R. Hardy, "Interplay between Ionic Breathing and Rotational
Instabulities in Perovskites," Ferroelectrics (in press).
- Q. Shen, H.Z. Cao, and J.R. Hardy, "Bismuth Valence and Lattice Dynamics
Studies in BaBiO3 by Molecular Dynamics," Physica C (in press).
- L.X. Zhou, J.R. Hardy and H.Z. Cao, "First-Principles Dynamical
Simulations of Superionicity in Alkaline-Earth Halides," submitted to
Solid State Communications, June 1995.
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