John R. Hardy Papers | Department of Physics and Astronomy: Publications and Other Research | University of Nebraska - Lincoln

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John R. Hardy Papers

Department of Physics and Astronomy: Publications and Other Research

John R. Hardy Papers

Professor Hardy earned his PhD 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 was 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 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 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 ACu₃Ti₄O₁₂ (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 Cs₂Nb₄O₁₁, Jianjun Liu, E. P. Kharitonova, Chun-Gang Duan, Wai-Ning Mei, R. W. Smith, and John R. Hardy

2004 2004

Electronic Properties of NaCdF₃: 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_2/3Cu₃Ti₄O₁₂, Jianjun Liu, Chun-Gang Duan, Wei-Guo Yin, Wai-Ning Mei, R. W. Smith, and John R. Hardy

Superionicity in Na₃PO₄: A Molecular Dynamics Simulation, Wei-Guo Yin, Jianjun Liu, Chun-Gang Duan, Wai-Ning Mei, R. W. Smith, and John R. Hardy

2003 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 Bi₂Ti₄O₁₁, 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 NaNO₂, 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 2002

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

2001 2001

Order-Disorder Phase Transitions in KNO₂ , CsNO₂, and TlNO₂ crystals: A molecular dynamics study, Chun-Gang Duan, Wai-Ning Mei, R. W. Smith, Jianjun Liu, M. M. Ossowski, and John R. Hardy

2000 2000

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

1999 1999

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

1997 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 1996

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

1995 1995

Lattice- and Molecular-Dynamics Studies of RbLiSO₄, V. Katkanant and John R. Hardy

1994 1994

Molecular-Dynamics Simulations of Some BaXF₄ Compounds, John Flocken, Z. Mo, Wai-Ning Mei, John R. Hardy, and Dorian Hatch

1992 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 CsLiSO₄, V. Katkanant

Raman Scattering and Lattice-Dynamical Calculations of Crystalline KNO₃, D. Liu, F. G. Ullman, and John R. Hardy

Raman Scattering and Lattice-Dynamical Calculations of Crystalline KNO₃, H. M. Lu

Phase transitions in K₂ZnCl₄, H. M. Lu and John R. Hardy

Simulations of phase transitions in Rb₂ZnCl₄, H. M. Lu and John R. Hardy

1991 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 K₂SO₄, D. Liu, H. M. Lu, F. G. Ullman, and John R. Hardy

First-principles study of phase transitions in KNO₃, H. M. Lu and John R. Hardy

1990 1990

Ab initio Studies of the Phase Transitions in K₂SeO₄, H. M. Lu and John R. Hardy

First-Principles Simulations of Ionic Molecular Solids: The Phase Transitions in K₂SeO₄, H. M. Lu and John R. Hardy

1989 1989

Theoretical Study of Lattice Instabilities in YBa₂Cu₃O₇, D. P. Billesbach, John R. Hardy, and P. J. Edwardson

Ferroelectricity in Perovskitelike NaCaF₃ 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 1988

Molecular-Dynamics Simulation of the Structural Phase Transition in Rb₂CaCl₄, D. P. Billesbach, P. J. Edwardson, and John R. Hardy

Simulation of the Polarizable-Ion Dynamics of Rb₂ZnCl₄, P. J. Edwardson and John R. Hardy

Possible Origins of High-T_c, Superconductivity, John R. Hardy and J. W. Flocken

1987 1987

Simulation of Normal Rb₂ZnCl₄ Near the Incommensurate Transition, P. J. Edwardson, V. Katkanant, John R. Hardy, and L. L. Boyer

1986 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 KCaF₃ and RbCaF₃: 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 Rb₂ZnC₄, V. Katanant, P.J. Edwardson, John Hardy, and L. L. Boyer

First-Principles Theoretical Explanation of Incommensurate Behavior in RbZnC₄, V. Katkanant, P. J. Edwardson, John R. Hardy, and L. L. Boyer

1985 1985

Birefringence Measurements of the Uniaxial-Stress Dependence of the Incommensurate Phase Transition in K₂SeO₄, 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 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 Gd₂(MoO₄)₃, J. Petzelt, F. Smutny, V. Katkanant, F. G. Ullman, John R. Hardy, A. A. Volkov, G. V. Kozlov, and S. P. Lebedev

1983 1983

Interpretation of Anomalies in the Raman Spectrum of K₂SeO₄ in Terms of Oxygen Sublattice Disorder, Nestor Massa, Frank Ullman, and John R. Hardy

1982 1982

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

1981 1981

Theoretical Study of the Structural Phase Transition in RbCaF₃, L. L. Boyer and John R. Hardy

1980 1980

Theoretical Lattice-Dynamical Studies of the Incommensurate Phase Transformation in K₂SeO₄, M. S. Haque and John R. Hardy

Effect of Hydrostatic Pressure on the Incommensurate Phase of K₂SeO₄, W. Press, C. F. Majkrzak, J. D. Axe, John R. Hardy, N. E. Massa, and F. G. Ullman

1976 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 1975

Effect of uniaxial stress on the unstable A₁ (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 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 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 C0₂ 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 1972

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

Frenkel Defects in Alkali Halides, Paul Schulze and John Hardy

1971 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 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 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 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 1967

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

1963 1963

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