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Mg2SnO4 ceramics I. Synthesisprocessingmicrostructure correlation

Summary: Mg2SnO4 ceramics
I. Synthesis±processing±microstructure correlation
Abdul-Majeed Azad *, Liew Jing Min
Department of Physics, University Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
Received 6 June 2000; received in revised form 18 June 2000; accepted 19 July 2000
Phase stability of magnesium meta- and orthostannate has been examined in samples synthesized via the traditional solid-state
reaction (SSR) and a novel self-heat-sustained (SHS) technique with two molar ratios of magnesium to tin (viz., 1:1 and 2:1). The
powder mixtures were calcined over a wide temperature±time (T±t) span ranging from 600 to 1300
C and 3 to 72 h. The powders
obtained from the two preparative methods have been processed and sintered under identical conditions. In the 2:1 molar mixtures,
Mg2SnO4 has been formed as a single phase up on calcination in both SRR and SHS methods. This phase remained the only
compound in the sintered bodies as well. In the 1:1 composition, the ultimate reaction product was a mixture of Mg2SnO4 and
SnO2. Both SSR and SHS techniques with 2:1 molar mixture yielded a single phase Mg2SnO4 in the sintered compacts. Compacts
with near zero porosity could be achieved in SSR derived samples up on sintering up to 1600
C, while some signi®cant porosity was
an interesting feature of the SHS derived samples. Systematic microstructural evolution with the variation of sintering conditions
has been discussed. # 2001 Elsevier Science Ltd and Techna S.r.l. All rights reserved.
Keywords: A. Sintering; B. Electron microscopy; B. X-ray methods; E. Capacitors
1. Introduction


Source: Azad, Abdul-Majeed - Department of Chemical and Environmental Engineering, University of Toledo


Collections: Materials Science; Energy Storage, Conversion and Utilization