Structures of four fast-ion conductors by single-crystal neutron-diffraction analysis: Zn-stabilized Na. beta. -alumina and Mg-stabilized Na-, K-, and Ag. beta. -aluminas
The crystal samples used were from the same batches as those used in other physical studies at Oak Ridge. Precise cell parameters were determined. The Zn/sup 2 +/ ion substitutes only in the Al(2) sites, as does Mg/sup 2 +/. The degree of substitution by Zn/sup 2 +/ (28.5% from chemical analysis and 29.3% from diffraction analysis) is less than that by Mg/sup 2 +/ (33.5% from chemical analysis and 34.9% for the average diffraction result from the three Mg-stabilized ..beta..''-aluminas). This implies more Na/sup +/ vacancies in Zn-stabilized Na..beta..''-alumina and may explain why it has a higher room-temperature conductivity than Mg-stabilized ..beta..''-alumina. Fourier maps of the conducting-ion distributions are presented. The 0(5) ions were treated as disordered in refinement of Mg-stabilized Ag- and Na..beta..''-aluminas.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 6509170
- Report Number(s):
- CONF-810566-3; ON: DE81024971
- Resource Relation:
- Conference: International conference on fast ionic transport in solids, Gatlinburg, TN, USA, 18 May 1981
- Country of Publication:
- United States
- Language:
- English
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ALUMINIUM OXIDES
CRYSTAL STRUCTURE
DOPED MATERIALS
LATTICE PARAMETERS
MAGNESIUM COMPOUNDS
MONOCRYSTALS
NEUTRON DIFFRACTION
ZINC COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
CHALCOGENIDES
COHERENT SCATTERING
CRYSTALS
DIFFRACTION
MATERIALS
OXIDES
OXYGEN COMPOUNDS
SCATTERING
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies