Defects in titanates

A Stashans - International journal of nanotechnology, 2004 - inderscienceonline.com
Electronic, structural and optical properties of titanates (BaTiO3, SrTiO3, CaTiO3 and
PbTiO3) containing different point defects are reviewed and discussed in the present work …

A quantum mechanical study of La-doped Pb (Zr, Ti) O3

A Stashans, F Maldonado - Physica B: Condensed Matter, 2007 - Elsevier
Lanthanum-modified Pb (Zr, Ti) O3 (PZT) crystals have been investigated applying a
quantum-mechanical approach based on the Hartree–Fock theory. A morphotropic phase …

Oxygen-vacancy defects on BaTiO3 (001) surface: a quantum chemical study

C Duque, A Stashans - Physica B: Condensed Matter, 2003 - Elsevier
A quantum-chemical study of technologically important BaTiO3 crystal and oxygen-vacancy
defects on its (001) surface is reported in the present work. The computations are made …

Superconductivity and Jahn-Teller polarons in titanates

A Stashans, H Pinto, P Sánchez - Journal of low temperature physics, 2003 - Springer
The present work focuses on the superconductivity phenomenon in La-doped SrTiO 3
crystal, and the Jahn-Teller (JT) polarons in BaTiO 3 crystal. In the case of SrTiO 3 crystal …

Theoretical study of structural and optical properties of F-centers in tetragonal BaTiO3

H Pinto, S Elliott, A Stashans - Advanced Organic and …, 2003 - spiedigitallibrary.org
Using the density functional theory (DFT) within the local density approximation (LDA) and a
method based on the Hartree-Fock (HF) approximation, we study the structural, electronic …

Mott–Wannier excitons in the tetragonal BaTiO3 lattice

LM Prócel, F Tipán, A Stashans - International journal of …, 2003 - Wiley Online Library
Structural and electronic properties of excitons in the tetragonal BaTiO3 crystal is studied
using a quantum chemical method developed for crystals. The obtained defect structure …

Oxgen-vacancy defects in PbTiO3 and BaTiO3 crystals: a quantum chemical study

S Serrano, C Duque, P Medina… - Advanced Organic and …, 2003 - spiedigitallibrary.org
We study effects produced by an O vacancy and F center in cubic and tetragonal lead
titanate (PbTiO 3) crystals as well as barium titanate (BaTiO 3)(001) surface. Displacements …

Structural and optical properties of F-center defects on barium titanate< 001> surface

C Duque, A Stashans - Materials Letters, 2003 - Elsevier
Structural and optical properties of F centers (two electrons trapped by an oxygen vacancy)
on the BaTiO3〈 001〉 surface are investigated using the quantum-chemical approach. The …

H atom in BaTiO3 and CaTiO3 crystals: structure, electronic properties, and diffusion

J Chimborazo, M Castillo, C Velasco… - … and Inorganic Optical …, 2003 - spiedigitallibrary.org
We investigate effects that an H impurity produces upon the geometry and the electronic
structure in the BaTiO 3 and CaTiO 3 crystals considering several lattices of these materials …

Quantum chemical modelling of Al-doped PZT crystals

S Serrano, A Celi, A Stashans - International journal of …, 2006 - inderscienceonline.com
Complete analysis of the electronic and structural changes of the lead zirconate titanate
(PZT) crystal due to aluminium impurity doping is done based on the computationally …