Lattice dynamics of orthorhombic NdGaO3

Lattice dynamics and vibrational spectra of the orthorhombic, tetragonal, and cubic phases of methylammonium lead iodide

Federico Brivio,1 Jarvist M. Frost,1 Jonathan M. Skelton,1 Adam J. Jackson,1 Oliver J. Weber,1 Mark T. Weller,1 Alejandro R. Goñi,2 Aurélien M. A. Leguy,3 Piers R. F. Barnes,3 and Aron Walsh1,4,* 1Centre for Sustainable Chemical Technologies and Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, United Kingdom 2ICREA, Passeig Lluı́s Companys 23, E-08010 Barcelona, Spain a...

Lattice dynamics and Mg/Ti order in orthorhombic pseudobrookite-type MgTi2O5

Mg/Ti order/disorder and the lattice dynamics of orthorhombic pseudobrookite-type MgTi2O5 have been studied by experiment and modeling. A mechanochemical activation by high speed ball milling allowed us to synthesize pure MgTi2O5 from MgO and TiO2 anatase at a comparatively low temperature of 1173K. The Mg/Ti order of MgTi2O5 was characterized by X-ray diffraction and Raman spectroscopy. Densit...

Lattice Dynamics of Tetracyanoethylene

Dynamics of lattice kinks

We consider a class of Hamiltonian nonlinear wave equations governing a field defined on a spatially discrete one dimensional lattice, with discreteness parameter, d = h, where h > 0 is the lattice spacing. The specific cases we consider in detail are the discrete sine-Gordon (SG) and discrete φ models. For finite d and in the continuum limit (d → ∞) these equations have static kink-like (heter...

Remarkable features in lattice-parameter ratios of crystals. I. Orthorhombic, tetragonal and hexagonal crystals.

The investigation of the lattice-parameter ratios of tetrahedral and hexagonal-rhombohedral inorganic compounds, as reported by Constant & Shlichta [(2003), Acta Cryst. A59, 281-282], has been extended to the structural data found for organic and metal-organic compounds (CSD), for bio-macromolecular crystals (PDB) and for inorganic materials (ICSD). In this first part of the series, the frequen...