| Texto completo | |
| Autor(es): |
Estrada, Flavia Regina
;
Garcia, Ducinei
Número total de Autores: 2
|
| Tipo de documento: | Artigo Científico |
| Fonte: | OPEN CERAMICS; v. 8, p. 8-pg., 2021-12-01. |
| Resumo | |
This paper presents a guideline to aid the space group determination of distorted perovskites by a combination of properties, selected area (SAED) and convergent beam electron diffraction (CBED). The case study reported here is based on the (Pb,Ca)TiO3 pseubinary-system. This material represents a combination of polar compound without inversion point (PbTiO3) and incipient-ferroelectric with octahedral tilting (CaTiO3). The practical aspects of each guideline step are: 1) Glazer tilt system determination; 2) lattice type determination; 3) indexing of the diffraction group; 4) point group determination by CBED, optionally combined with analysis of the groupsubgroup relationship of the phase diagram compounds and/or the physical properties; 5) observation of the symmetry of systematic absent spots (G-M lines); and 6) matching of the G-M symmetries with the space group possibilities. This work highlights the use of the presented set of characterization to make possible the space group analysis for perovskite polycrystals with tiny distortion. (AU) | |
| Processo FAPESP: | 08/04025-0 - Materiais multifuncionais multiferróicos nanoestruturados: síntese, propriedades, fenomenologia e aplicações |
| Beneficiário: | José Antonio Eiras |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |