Synchrotron x-ray diffraction study of the surface layer in poled ceramic BaTiO{sub 3}
- National Inst. of Standards and Technology, Boulder, CO (United States)
- Colorado Univ., Boulder, CO (United States)
Both unpoled and poled BaTiO{sub 3} were studied by laboratory and synchrotron x-ray sources. The shorter-wavelength synchrotron radiation was used to probe deeper below the surface. Diffraction patterns revealed a distinctive surface layer of the same tetragonal structure as the main BaTiO{sub 3} fraction. A sin{sup 2}{Psi} analysis of peak shift confirmed that no measurable change of elastic strain occurs upon poling, indicating that poling may induce excessive strain that was relieved by microcracking or that a majority of domains reverse orientation. However, domain switching and possible microcracking may induced inhomogeneous strain (microstrain) and alter domain-size distribution. Line-broadening analysis showed large anisotropy of both coherently diffracting domain size and microstrain. The poled specimen shows a larger microstrain and smaller average domain size, which indicates possible effects of microcracking and additional defects created during poling.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research, Washington, DC (United States)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 449437
- Report Number(s):
- BNL-63969; CONF-961202-68; ON: DE97003166
- Resource Relation:
- Conference: 1996 Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 2-6 Dec 1996; Other Information: PBD: Jan 1997
- Country of Publication:
- United States
- Language:
- English
Similar Records
Mesoscale response of individual grains of polycrystalline BaTiO{sub 3}to electrical loading.
Electric-field-induced strain contributions in morphotropic phase boundary composition of (Bi{sub 1/2}Na{sub 1/2})TiO{sub 3}-BaTiO{sub 3} during poling