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Microstructural evolution in MSnO3 ceramics derived via self-heat-sustained (SHS) reaction technique
 

Summary: Microstructural evolution in MSnO3 ceramics derived via
self-heat-sustained (SHS) reaction technique
Abdul-Majeed Azad *, Lucia Liew Woan Shyan, Toh Yen Pang, Chen Hon Nee
Department of Physics, University Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
Received 20 September 1999; received in revised form 9 October 1999; accepted 23 November 1999
Abstract
A thorough study of MSnO3 (M=Ca, Sr and Ba) compounds with respect to their synthesis, processing and microstructural
characterization has been made. In order to establish a standard methodology with identical and beneŽcial microstructure and
reproducible electrical characteristics, a novel preparative method called self-heat-sustained (SHS) reaction technique was
employed. Evolution of microstructure which is intimately related to the envisaged properties in the ceramics, was closely and sys-
tematically followed in terms of wide temperature-soak time (T-t) proŽles. The results showed that while a well-densiŽed micro-
structure with small grain size ($1 mm) and near zero porosity could be obtained by selecting a sintering schedule of 1350
C/x h
(48 h < x 4 60 h) for CaSnO3 samples, very well sintered samples with relatively larger grains (3ą5 mm) and minimal porosity
could also be obtained by sintering at 1600
C for 2 h. Well-densiŽed microstructure with small grain size and zero or near zero
porosity could be obtained by a sintering schedule of 1350
C/x h (12 h < x 4 24 h) in SrSnO3 samples. Sintering of BaSnO3
proved to be the most dicult. The BaSnO3 samples could only be densiŽed to the desired level by soaking the powder compacts
for 2 h at 1600

  

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

 

Collections: Materials Science; Energy Storage, Conversion and Utilization