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Structural Design and Synthesis of H3O+-β”/βAl2O3 and NH4-β”/β-Al2O3 Polycrystals

Published online by Cambridge University Press:  21 February 2011

Patrick S. Nicholson
Patrick S. Nicholson*
Affiliation:
Ceramic Engineering Research Group Department of Materials Science and Engineering McMaster University Hamilton, Ontario, Canada L8S 4L7
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Abstract

The synthesis and characterization of H3Oβ”/β-Al2O3 and NH4 + -H3O+β”/β-Al2O3 poly-crystals is described. The role of stress development and control in the intermediate stages of ion-exchange of the NaK-β”/βA12O3 ceramics is analysed and identifies the β-Al2O3 phase as acting as inert reinforcement for the two-phase composite. The Rb + ion-exchange of the intermediate K + β”/β-Al2O3 requisite for NH4+/H3O + ion-exchange to NH4-H3O+β”/βAl2O3 is described as also is the NH4NO3 exchange to the final ceramic. The total weight loss on heating NH4-H3O+β”/βAl2O3 polycrystals to 810°C is 7.4% which agrees with the value expected from the chemical formula. The 25°C conductivity of the grains of NH4 +-H3O + β”/βAl2O3 was 1.7 × 10−4 (ω-cm)−1 and the bulk conductivity was 3 × 10−5(ω-cm)−1.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 135: Symposium M – Solid State Ionics I , 1988 , 511
Copyright
Copyright © Materials Research Society 1989

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