**John R. Hardy**

George Holmes Distinguished Professor of Physics and Astronomy at the University of Nebraska-Lincoln, Adjunct Professor of Physics at the University of Nebraska-Omaha.

Professor Hardy earned his Ph.D. at Bristol University in England in 1959. He 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.

#### 2006

Erratum: Strain Induced Half-Metal to Semiconductor Transition in GdN, Chun-gang Duan, R.F. Sabiryanov, Jianjun Liu, Wai-Ning Mei, Peter A. Dowben, and J.R. Hardy

#### 2005

Strain Induced Half-Metal to Semiconductor Transition in GdN, Chun-gang Duan, Renat F. Sabirianov, Jianjun Liu, Wai-Ning Mei, Peter A. Dowben, and J. R. Hardy

Dielectric Properties and Maxwell-Wagner Relaxation of Xompounds ACu_{3}Ti_{4}O_{12} (A=Ca,Bi_{2/3},Y_{2/3},La_{2/3}), Jianjun Liu, Chun-Gang Duan, Wai-Ning Mei, R. W. Smith, and John R. Hardy

Phase Transition in Single Crystal Cs_{2}Nb_{4}O_{11}, Jianjun Liu, E. P. Kharitonova, Chun-Gang Duan, Wai-Ning Mei, R. W. Smith, and John R. Hardy

#### 2004

Electronic Properties of NaCdF_{3}: A First-Principles Prediction, Chun-gang Duan, Wai-Ning Mei, Jianjun Liu, Wei-Guo Yin, John R. Hardy, R. W. Smith, M. J. Mehl, and L. L. Boyer

Simulations of ferroelectric polymer film polarization: The role of dipole interactions, Chun-gang Duan, Wai-Ning Mei, Wei-Guo Yin, Jianjun Liu, J. R. Hardy, Stephen Ducharme, and Peter A. Dowben

Theoretical study of the magnetic ordering in rare-earth compounds with face-centered-cubic structure, Chun-gang Duan, Renat F. Sabirianov, Jianjun Liu, Wai-Ning Mei, Peter A. Dowben, and John R. Hardy

Large Dielectric Constant and Maxwell-Wagner Relaxation in Bi_{2/3}Cu_{3}Ti_{4}O_{12}, Jianjun Liu, Chun-Gang Duan, Wei-Guo Yin, Wai-Ning Mei, R. W. Smith, and John R. Hardy

Superionicity in Na_{3}PO_{4}: A Molecular Dynamics Simulation, Wei-Guo Yin, Jianjun Liu, Chun-Gang Duan, Wai-Ning Mei, R. W. Smith, and John R. Hardy

#### 2003

Comparison of the theoretical and experimental band structure of poly(vinylidene fluoride) crystal, Chun-gang Duan, Wai-Ning Mei, J.R. Hardy, Stephen Ducharme, Jaewu Choi, and Peter A. Dowben

Theoretical study on the optical properties of polyvinylidene fluoride crystal, Chun-gang Duan, Wai-Ning Mei, Wei-Guo Yin, Jianjun Liu, J. R. Hardy, Mengjun Bai, and Stephen Ducharme

Dielectric Permittivity and Electric Modulus in Bi_{2}Ti_{4}O_{11}, Jianjun Liu, Chun-Gang Duan, Wai-Ning Mei, R. W. Smith, and John R. Hardy

Molecular Dynamics Simulation of the Order-Disorder Phase Transition in Solid NaNO_{2}, Wei-Guo Yin, Chun-Gang Duan, Wai-Ning Mei, Jianjun Liu, R. W. Smith, and John R. Hardy

Spectral Functions of the Falicov-Kimball Model with Electronic Ferroelectricity, Wei-Guo Yin, Wai-Ning Mei, Chun-Gang Duan, Hai-Qing Lin, and John R. Hardy

#### 2002

Polymorphous Transformations in Alkaline-Earth Silicates, Jianjun Liu, Chun-Gang Duan, Wai-Ning Mei, R. W. Smith, and John R. Hardy

#### 2001

Order-Disorder Phase Transitions in KNO_{2} , CsNO_{2}, and TlNO_{2} crystals: A molecular dynamics study, Chun-Gang Duan, Wai-Ning Mei, R. W. Smith, Jianjun Liu, M. M. Ossowski, and John R. Hardy

#### 2000

Molecular-Dynamics Study of Phase Transitions in Alkali Thiocyanates, M. M. Ossowski, John R. Hardy, and R. W. Smith

#### 1999

Molecular-Dynamics Study of Phase Transitions in Alkali Azides, M. M. Ossowski, John R. Hardy, and R. W. Smith

#### 1997

Centimeter-Wave Reflection in the Nitrates and Nitrites of Sodium and Potassium: Experiment and Theory, Steven G. Cornelison; Arthur Guass, Jr.; J. Krane; and John R. Hardy

Raman-Scattering Study of the Order-Disorder Phase Transition in KSCN, R. Li and John R. Hardy

#### 1996

Donald J. Montgomery, Sitaram Jaswal, John Hardy, and Paul M. Parker

#### 1995

Lattice- and Molecular-Dynamics Studies of RbLiSO_{4}, V. Katkanant and John R. Hardy

#### 1994

Molecular-Dynamics Simulations of Some BaXF_{4} Compounds, John Flocken, Z. Mo, Wai-Ning Mei, John R. Hardy, and Dorian Hatch

#### 1992

Fractal Character of Two-Dimensional Fluid Mixing at Both Continuum and Atomic Levels, H. Z. Cao, John Hardy, R. W. Douglass, P. T. Dawkins, and Steven Dunbar

Arnold M. Karo, John R. Creighton, John R. Hiskes, Fredrick McMurphy, and John R. Hardy

Lattice- and Molecular-Dynamics Studies of Phase Transitions in CsLiSO_{4}, V. Katkanant

Raman Scattering and Lattice-Dynamical Calculations of Crystalline KNO_{3}, D. Liu, F. G. Ullman, and John R. Hardy

Raman Scattering and Lattice-Dynamical Calculations of Crystalline KNO_{3}, H. M. Lu

Phase transitions in K_{2}ZnCl_{4}, H. M. Lu and John R. Hardy

Simulations of phase transitions in Rb_{2}ZnCl_{4}, H. M. Lu and John R. Hardy

#### 1991

Raman Scattering and Lattice-Dynamical Calculations of Alkali-Metal Sulfates, D. Liu, H. M. Lu, John R. Hardy, and F. G. Ullman

First-Principles Study of the Lattice Dynamics of K_{2}SO_{4}, D. Liu, H. M. Lu, F. G. Ullman, and John R. Hardy

First-principles study of phase transitions in KNO_{3}, H. M. Lu and John R. Hardy

#### 1990

*Ab initio* Studies of the Phase Transitions in K_{2}SeO_{4}, H. M. Lu and John R. Hardy

First-Principles Simulations of Ionic Molecular Solids: The Phase Transitions in K_{2}SeO_{4}, H. M. Lu and John R. Hardy

#### 1989

Theoretical Study of Lattice Instabilities in YBa_{2}Cu_{3}O_{7}, D. P. Billesbach, John R. Hardy, and P. J. Edwardson

Ferroelectricity in Perovskitelike NaCaF_{3} predicted *ab initio*, P. J. Edwardson, L. L. Boyer, R. L. Newman, D. H. Fox, John R. Hardy, J. W. Flocken, R. A. Guenther, and Wai-Ning Mei

Calculation of Dielectric Susceptibility for Complex Ionic Systems: Application to a Predicted Superlattice, J. L. Feldman, L. L. Boyer, and P. J. Edwardson

Dielectric Response Spectrum of a Damped One-Dimensional Double-Well Oscillator, J. W. Flocken, R. A. Guenther, John R. Hardy, and L. L. Boyer

#### 1988

Molecular-Dynamics Simulation of the Structural Phase Transition in Rb_{2}CaCl_{4}, D. P. Billesbach, P. J. Edwardson, and John R. Hardy

Simulation of the Polarizable-Ion Dynamics of Rb_{2}ZnCl_{4}, P. J. Edwardson and John R. Hardy

Possible Origins of High-*T _{c}*, Superconductivity, John R. Hardy and J. W. Flocken

#### 1987

Simulation of Normal Rb_{2}ZnCl_{4} Near the Incommensurate Transition, P. J. Edwardson, V. Katkanant, John R. Hardy, and L. L. Boyer

#### 1986

Beyond the Rigid-Ion Approximation with Spherically Symmetric Ions, L. L. Boyer, M. J. Mehl, J. L. Feldman, John R. Hardy, J. W. Flocken, and C. Y. Fong

*A Priori *Predictions of Phase Transitions in KCaF_{3} and RbCaF_{3}: Existence of a New Ground State, J. W. Flocken, R. A. Guenther, John R. Hardy, and L. L. Boyer

Errata: First-Principles Theoretical Explanation of Incommensurate Behavior in Rb_{2}ZnC_{4}, V. Katanant, P.J. Edwardson, John Hardy, and L. L. Boyer

First-Principles Theoretical Explanation of Incommensurate Behavior in RbZnC_{4}, V. Katkanant, P. J. Edwardson, John R. Hardy, and L. L. Boyer

#### 1985

Birefringence Measurements of the Uniaxial-Stress Dependence of the Incommensurate Phase Transition in K_{2}SeO_{4}, D. P. Billesbach, F. G. Ullman, and John R. Hardy

Beyond the Rigid-Ion Approximation with Spherically Symmetric Ions, L. L. Boyer, M. J. Mehl, J. L. Feldman, John R. Hardy, J. W. Flocken, and C. Y. Fong

First-Principles Study of Structural Instabilities in Halide-Based Perovskites: Competition Between Ferroelectricity and Ferroelasticity, J. W. Flocken, R. A. Guenther, John R. Hardy, and L. L. Boyer

#### 1984

Model Calculations of the Micrometer to Millimeter Intrinsic Absorption for Simple Ceramics, John R. Hardy, P. J. Edwardson, and J. A. O'Gara

Central-Peak-Soft-Mode, Coupling in Ferroelectric Gd_{2}(MoO_{4})_{3}, J. Petzelt, F. Smutny, V. Katkanant, F. G. Ullman, John R. Hardy, A. A. Volkov, G. V. Kozlov, and S. P. Lebedev

#### 1983

Interpretation of Anomalies in the Raman Spectrum of K_{2}SeO_{4} in Terms of Oxygen Sublattice Disorder, Nestor Massa, Frank Ullman, and John R. Hardy

#### 1982

Theoretical Study of the Long-Wavelength Optical Properties of NaCl, KCl, KBr, and KI, John R. Hardy and A. M. Karo

#### 1981

Theoretical Study of the Structural Phase Transition in RbCaF_{3}, L. L. Boyer and John R. Hardy

#### 1980

Theoretical Lattice-Dynamical Studies of the Incommensurate Phase Transformation in K_{2}SeO_{4}, M. S. Haque and John R. Hardy

Effect of Hydrostatic Pressure on the Incommensurate Phase of K_{2}SeO_{4}, W. Press, C. F. Majkrzak, J. D. Axe, John R. Hardy, N. E. Massa, and F. G. Ullman

#### 1976

Raman spectrum of gadolinium molybdate at 80°K, B.N. Ganguly, Frank G. Ullman, Roger D. Kirby, and John R. Hardy

Reply to “Comments on ‘Theoretical study of impurity-induced first-order Raman spectra for the alkali halides’”, John R. Hardy and Arnold Karo

#### 1975

Effect of uniaxial stress on the unstable *A*_{1} (TO) phonon in ferroelectric gadolinium molybdate, B.N. Ganguly, Frank G. Ullman, Roger D. Kirby, and J.R. Hardy

Theoretical Study of Impurity-Induced First-Order Raman Spectra for the Alkali Halides, Arnold Karo and John Hardy

Theoretical Study of Impurity-Induced First-Order Raman Spectra for the Alkali Halides, Arnold Karo and John R. Hardy

#### 1974

Theoretical and experimental studies of the second-order Raman spectra of CsCl, CsBr, and CsI, B.S. Agrawal, Roger D. Kirby, and John R. Hardy

Second-Order Raman Scattering in Alkali Fluoride Crystals, S. L. Cunningham, T. P. Sharma, Sitaram Jaswal, M. Hass, and John R. Hardy

#### 1973

Lattice Dynamics of a Rigid-Ion Model for Gadolinium Molybdate, L. L. Boyer and John R. Hardy

Static Equilibrium Conditions for a Rigid-Ion Crystal, L. L. Boyer and John R. Hardy

Determination of the Origin of the 10.6-pm Absorption in C0_{2} Laser Window Materials, John R. Hardy and B. S. Agrawal

Raman Spectrum of Gadolinium Molybdate Above and Below the Ferroelectric Transition, Frank Ullman, B. J. Holden, B. N. Ganguly, and John R. Hardy

#### 1972

Schottky Defects in Alkali Halides, Paul D. Schulze and John R. Hardy

Frenkel Defects in Alkali Halides, Paul Schulze and John Hardy

#### 1971

Application of the Method of Lattice Statics to Vacancies in Aluminum, Larry Boyer and John R. Hardy

Calculation of Point-Defect Energies and Displacements in Alkali Halides Using the Lattice-Statics Method, Arnold Karo and John Hardy

#### 1970

Calculations of the Intensity of X-Ray Diffuse Scattering Produced by Point Defects in Cubic Metals, John W. Flocken and John Hardy

Asymptotic Lattice Displacements about Point Defects in Cubic Metals, John W. Flocken and John R. Hardy

#### 1969

Application of the Method of Lattice Statics to Vacancies in Na, K, Rb, and Cs, John W. Flocken and John R. Hardy

Lattice Dynamics and Second-Order Raman Spectrum of NaF, John R. Hardy, A. M. Karo, I. W. Morrison, C. T. Sennett, and J. P. Russell

Lattice Dynamics of NaF, Arnold Karo and John R. Hardy

#### 1968

Application of the Method of Lattice Statics to Interstitial Cu Atoms in Cu, John Flocken and John Hardy

Lattice Dynamics and Second-Order Raman Spectrum of CsF, John R. Hardy and Arnold Karo

Infrared Absorption Properties of LiH, LiD Mixed Crystals, Sitaram S. Jaswal and John R. Hardy

#### 1967

Room-Temperature Second-Order Raman Spectra of CsC1, CsBr, and CsI, A. M. Karo and John R. Hardy

#### 1963

Lattice Dynamics and Specific-Heat Data for Rocksalt-Structure Alkali Halides, Arnold Karo and John R. Hardy