Journal ArticleDOI
X-ray and neutron diffraction study of tetragonal barium titanate
J. Harada,T. Pedersen,Z. Barnea +2 more
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In this paper, an attempt is made to differentiate between the three previously proposed models of the structure of tetragonal BaTiO3 by using both neutron and X-ray diffraction data collected from c-domain single crystals.Abstract:
An attempt is made to differentiate between the three previously proposed models of the structure of tetragonal BaTiO3. In the new model, the serious parameter-interaction problem was avoided by the use of both neutron and X-ray diffraction data collected from c-domain single crystals. The result of the refinement gave the displacement of the Ti atom from its cubic position as 0.0135 ± 0.0004 A; the R value was 0.027 and 0.024 for the neutron and X-ray data respectively. The analysis also showed that the temperature parameters, B33, along the c axis are approximately independent of mass; B33 = 0.32 ± 0.03 A2 from X-ray and 0.33 ± 0.04 A2 from neutron diffraction. The average value obtained for the B11 temperature parameters, B11 = 0.50 A2, is considerably higher than the B33 value, which thus clearly indicates the existence of low frequency optic modes at room temperature.read more
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Structural phase transitions I. Landau theory
TL;DR: In this paper, a review of the application of the Landau-Ginzburg theory to a wide variety of different phenomena which can occur at structural phase transitions is given, in particular, emphasis is placed on the nature of the fluctuations within Landau GINZburg theory and on the role of secondary order parameters.
Journal ArticleDOI
Influence of foreign ions on the crystal structure of BaTiO3
TL;DR: In this article, the influence of dopants on the crystal structure of barium titanate was studied at room temperature and at 250°C using X-ray diffraction, and the results of atomistic computer simulations gave indication on the preferential incorporation site of the dopant.
Journal ArticleDOI
FT Raman and FTIR studies of titanias and metatitanate powders
Guido Busca,Gianguido Ramis,José Manuel Gallardo Amores,Vicente Sanchez Escribano,Paolo Piaggio +4 more
TL;DR: In this article, the FTIR/FTFIR skeletal spectra of different TiO2 powders, of both synthetic and commercial origin, and of Sr, Ba, Co and Ni metatitanates are reported and discussed in relation to the predictions of factor group analyses.
Journal ArticleDOI
Practical High Piezoelectricity in Barium Titanate Ceramics Utilizing Multiphase Convergence with Broad Structural Flexibility.
Chunlin Zhao,Haijun Wu,Fei Li,Yongqing Cai,Yang Zhang,Dongsheng Song,Jiagang Wu,Xiang Lyu,Jie Yin,Dingquan Xiao,Jianguo Zhu,Stephen J. Pennycook +11 more
TL;DR: This work offers a new paradigm for designing lead-free functional materials with superior electromechanical properties by employing a novel phase-boundary engineering strategy utilizing the multiphase convergence, which induces a broad structural flexibility in a wide phase- boundary zone with contiguous polymorphic phase transitions.
Journal ArticleDOI
Neutron inelastic scattering study of the lattice dynamics of strontium titanate: harmonic models
TL;DR: In this article, the frequency distribution, specific heat, one-phonon X ray scattering intensity, Debye-Waller factor, and two-photon Raman spectrum have been calculated; where possible, these are compared with the available experimental measurements.