Please use this identifier to cite or link to this item: http://cmuir.cmu.ac.th/jspui/handle/6653943832/56302
Title: Fabrication, phase formation and microstructure of Ni<inf>4</inf>Nb<inf>2</inf>O<inf>9</inf> ceramics fabricated by using the two-stage sintering technique
Authors: Orawan Khamman
Jiraporn Jainumpone
Anucha Watcharapasorn
Supon Ananta
Keywords: Physics and Astronomy
Issue Date: 1-Aug-2016
Abstract: © 2016, The Korean Physical Society. The potential utilization of two-stage sintering for the production of very dense and pure nickel diniobate (Ni4Nb2O9) ceramics with low firing temperature was demonstrated. The effects of the designed sintering conditions on the phase formation, densification and microstructure of the ceramics were characterized by using X-ray diffraction (XRD), Archimedes method and scanning electron microscopy (SEM), respectively. The minor phase of columbite NiNb2O6 tended to form together with the desired Ni4Nb2O9 phase, depending on the sintering conditions. Optimization of the sintering conditions may lead to a single-phase Ni4Nb2O9 ceramics with an orthorhombic structure. The ceramics doubly sintered at 950/1250 ◦C for 4 h exhibited a maximum density of ~92%. Microstructures with denser angular grain-packing were generally found in the sintered Ni4Nb2O9 ceramics. However, the grains were irregular in shape when the samples were sintered at 1050/1250 ◦C. Two-stage sintering was also found to enhance the ferroelectric behavior of the Ni4Nb2O9 ceramic.
URI: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84982278710&origin=inward
http://cmuir.cmu.ac.th/jspui/handle/6653943832/56302
ISSN: 19768524
03744884
Appears in Collections:CMUL: Journal Articles

Files in This Item:
There are no files associated with this item.


Items in CMUIR are protected by copyright, with all rights reserved, unless otherwise indicated.