Josef W. Zwanziger

Professor

Canada Research Chair, Tier I: NMR Studies of materials

Email: jzwanzig@dal.ca

View Josef W. Zwanziger's Publications Sorted by Date

Recent Submissions

  • Thermal, vibrational, and thermoelastic properties of Y2Mo3O12 and their relations to negative thermal expansion 

    Phys. Rev. B 90, 024305
    Y2 Mo3O12, a material that exhibits negative thermal expansion (NTE) from 10 to 1173 K, offers an excellent opportunity to examine relationships between NTE and other physical properties over a wide temperature range. We ...
  • The heat capacities of thermomiotic ScF3 and ScF3–YF3 solid solutions 

    Journal of Materials Science May 2015, Volume 50, Issue 9, pp 3409-3415
    Scandium trifluoride (ScF3) exists in a cubic ReO3 structure that exhibits negative thermal expansion from 10 to 1100 K, while substituted Sc1−x Y x F3 materials display the same behavior at room temperature but transition ...
  • Zero Thermal Expansion in ZrMgMo3O12: NMR Crystallography Reveals Origins of Thermoelastic Properties 

    Chem. Mater., 2015, 27 (7), pp 2633–2646 DOI: 10.1021/acs.chemmater.5b00429
    The coefficient of thermal expansion of ZrMgMo3O12 has been measured and was found to be extremely close to zero over a wide temperature range including room temperature ( = (1.6 ± 0.2) × 10–7 K–1 from 25 to 450 °C by X-ray ...
  • Temperature dependent lattice misfit and coherency of Al3X (X = Sc, Zr, Ti and Nb) particles in an Al matrix 

    Saumitra Saha, T.Z. Todorova, J.W. Zwanziger, Temperature dependent lattice misfit and coherency of Al3X (X = Sc, Zr, Ti and Nb) particles in an Al matrix, Acta Materialia, Volume 89, 1 May 2015, Pages 109-115, ISSN 1359-6454, http://dx.doi.org/10.1016/j.actamat.2015.02.004
    The lattice coherency and critical radii for Al3X precipitates in an aluminum matrix were computed using first-principles methods. From density functional perturbation theory and the quasi-harmonic approximation, the unit ...
  • Topological constraints and the Makishima–Mackenzie model 

    M. Plucinski, J.W. Zwanziger, Topological constraints and the Makishima–Mackenzie model, Journal of Non-Crystalline Solids, Volume 429, 1 December 2015, Pages 20-23, ISSN 0022-3093, http://dx.doi.org/10.1016/j.jnoncrysol.2015.08.029
    Computations of the elastic properties of networks with bond stretch and bond angle bend forces are carried out in order to study their behavior as a function of average coordination number. It is found that the elastic ...
  • Relating 139La Quadrupolar Coupling Constants to Polyhedral Distortion in Crystalline Structures 

    Relating 139La Quadrupolar Coupling Constants to Polyhedral Distortion in Crystalline Structures Alexander L. Paterson, Margaret A. Hanson, Ulrike Werner-Zwanziger, and Josef W. Zwanziger The Journal of Physical Chemistry C 2015 119 (45), 25508-25517 DOI: 10.1021/acs.jpcc.5b09122
    A broad series of crystalline lanthanum oxide-based materials has been investigated through high-field 139La solid state nuclear magnetic resonance (ssNMR) spectroscopy and ab initio density functional theory (DFT) ...
  • Designing glass with non-dispersive stress-optic response 

    J. Galbraith, J.W. Zwanziger, Designing glass with non-dispersive stress-optic response, Journal of Non-Crystalline Solids, Volume 433, 1 February 2016, Pages 82-86, ISSN 0022-3093, http://dx.doi.org/10.1016/j.jnoncrysol.2015.11.027
    The dispersion of the stress-optic response of a series of barium and lead phosphate glasses is measured using an ellipsometric method. It is found that the barium glasses display consistently positive dispersion with ...
  • Nanoindentation Study of the Surface of Ion-Exchanged Lithium Silicate Glass 

    Nanoindentation Study of the Surface of Ion-Exchanged Lithium Silicate Glass Courtney Calahoo, Xiaofang Zhang, and J. W. Zwanziger The Journal of Physical Chemistry C 2016 120 (10), 5585-5598 DOI: 10.1021/acs.jpcc.6b00733
    Variations in mechanical properties (stiffness and hardness) were measured as a function of case depth in ion-exchange glasses using nanoindentation. A simple silicate composition, 30Li2O–70Si2O, was exchanged (Li+ ↔ K+) ...
  • Mechanical–Structural Investigation of Ion-Exchanged Lithium Silicate Glass using Micro-Raman Spectroscopy 

    Mechanical–Structural Investigation of Ion-Exchanged Lithium Silicate Glass using Micro-Raman Spectroscopy Courtney Calahoo, J. W. Zwanziger, and Ian S. Butler The Journal of Physical Chemistry C 2016 120 (13), 7213-7232 DOI: 10.1021/acs.jpcc.6b01720
    Micro-Raman spectroscopy was used to determine the structural modifications occurring in a simple ion-exchanged glass. The base lithium silicate composition 30Li2O–70SiO2 was studied as it underwent ion exchange, Li+ ↔ K+, ...
  • Structure and Disorder of Phosphates in Ag2o-Agi-P2o5 Glasses 

    ZWANZIGER, JW, KK OLSEN, and SL TAGG. 1993. "Structure and Disorder of Phosphates in Ag2o-Agi-P2o5 Glasses." Physical Review B 47(21): 14618-14621. doi:10.1103/PhysRevB.47.14618
    We directly probe the microstructure of the different phosphates in several glasses in the Ag2O-AgI-P2O5 system, by means of variable angle correlation NMR spectroscopy. This two-dimensional experiment separates the ...
  • Measuring the Geometric Component of the Transition-Probability in a 2-Level System 

    ZWANZIGER, JW, SP RUCKER, and GC CHINGAS. 1991. "Measuring the Geometric Component of the Transition-Probability in a 2-Level System." Physical Review a 43(7): 3232-3240. doi:10.1103/PhysRevA.43.3232
    We describe the measurement of a component of the nonadiabatic transition probability in a two-level system that depends only on the path through parameter space followed by the Hamiltonian, and not on how fast the path ...
  • Sodium distribution in sodium tellurite glasses probed with spin-echo NMR 

    Zwanziger, JW, JC McLaughlin, and SL Tagg. 1997. "Sodium distribution in sodium tellurite glasses probed with spin-echo NMR." Physical Review B 56(9): 5243-5249. doi:10.1103/PhysRevB.56.5243
    We present results on the spatial distribution of sodium cations in sodium tellurite glasses as a function of sodium oxide content, obtained using a spin-echo NMR experiment. Glasses were studied with sodium oxide content ...
  • Phonon dispersion and Gruneisen parameters of zinc dicyanide and cadmium dicyanide from first principles: Origin of negative thermal expansion. 

    Zwanziger, J. W.. 2007. "Phonon dispersion and Gruneisen parameters of zinc dicyanide and cadmium dicyanide from first principles: Origin of negative thermal expansion.." Physical Review B: Condensed Matter and Materials Physics 76(5): 0521021-052102/4. doi:10.1103/PhysRevB.76.052102
    Zinc dicyanide, Zn(CN)2, and the isostructural cadmium dicyanide show neg. thermal expansion over a broad range of temps. By the use of d. functional theory calcns., we det. the phonon dispersion curves of these materials ...
  • First-principles study of the nuclear quadrupole resonance parameters and orbital ordering in LaTiO3. 

    Zwanziger, J. W.. 2009. "First-principles study of the nuclear quadrupole resonance parameters and orbital ordering in LaTiO3.." Physical Review B: Condensed Matter and Materials Physics 79(3): 0331121-033112/4. doi:10.1103/PhysRevB.79.033112
    The electronic structure of the distorted perovskite LaTiO3 is studied using d.-functional theory, implemented with a projector-augmented wave formalism together with the local-d. approxn. plus Hubbard U-parameter (LDA+U) ...
  • Non-Abelian Effects in a Quadrupole System Rotating Around 2 Axes 

    ZWANZIGER, JW, M. KOENIG, and A. PINES. 1990. "Non-Abelian Effects in a Quadrupole System Rotating Around 2 Axes." Physical Review a 42(5): 3107-3110. doi:10.1103/PhysRevA.42.3107
    No abstract available.
  • Density-operator theory of orbital magnetic susceptibility in periodic insulators 

    Gonze, X., and J. W. Zwanziger. 2011. "Density-operator theory of orbital magnetic susceptibility in periodic insulators." Physical Review B 84(6): 064445-064445. doi:10.1103/PhysRevB.84.064445
    The theoretical treatment of homogeneous static magnetic fields in periodic systems is challenging, as the corresponding vector potential breaks the translational invariance of the Hamiltonian. Based on density operators ...
  • Fractional Quantization of Molecular Pseudorotation in Na-3 

    DELACRETAZ, G., ER GRANT, RL WHETTEN, L. WOSTE, et al. 1986. "Fractional Quantization of Molecular Pseudorotation in Na-3." Physical Review Letters 56(24): 2598-2601. doi:10.1103/PhysRevLett.56.2598
    No abstract available.