Publication: Phase transitional behavior and dielectric properties of lead free (1-x)(K<inf>0.5</inf>Na<inf>0.5</inf>)NbO<inf>3</inf>-xBi (Zn<inf>0.5</inf>Ti<inf>0.5</inf>)O<inf>3</inf>ceramics
Issued Date
2009-06-24
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ISSN
09258388
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2-s2.0-67349167679
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Mahidol University
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SCOPUS
Bibliographic Citation
Journal of Alloys and Compounds. Vol.479, No.1-2 (2009), 462-466
Suggested Citation
Manoon Sutapun, Chien Chih Huang, David P. Cann, Naratip Vittayakorn Phase transitional behavior and dielectric properties of lead free (1-x)(K<inf>0.5</inf>Na<inf>0.5</inf>)NbO<inf>3</inf>-xBi (Zn<inf>0.5</inf>Ti<inf>0.5</inf>)O<inf>3</inf>ceramics. Journal of Alloys and Compounds. Vol.479, No.1-2 (2009), 462-466. doi:10.1016/j.jallcom.2008.12.096 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/27555
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Title
Phase transitional behavior and dielectric properties of lead free (1-x)(K<inf>0.5</inf>Na<inf>0.5</inf>)NbO<inf>3</inf>-xBi (Zn<inf>0.5</inf>Ti<inf>0.5</inf>)O<inf>3</inf>ceramics
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Abstract
Lead-free ceramics based on potassium sodium niobate [(K0.5Na0.5)NbO3; KNN]-bismuth zinc titanate [Bi(Zn0.5Ti0.5)O3; BZT] were prepared by the modified-conventional mixed oxide route with normal sintering. The crystal structure and ferroelectric phase transitions were studied by means of X-ray diffraction, thermal and dielectric measurements. The ceramics with perovskite structure were in orthorhombic phase at x ≤ 0.010. When reaching 0.01 < x ≤ 0.03, they became a rhombohedral perovskite structure; and with increasing BZT content, cubic within the studied composition range. The phase Bi2Ti2O7with cubic structure began to appear at x > 0.25 and became dominant while increasing the content of BZT. Furthermore, the phase transition temperature of orthorhombic-tetragonal (TO-T) and tetragonal-cubic (TC) decreased when a small amount of BZT was added. As the amount of BZT concentration increased, the structure became denser, and well developed grain morphology with almost no porosity was finally obtained. © 2008 Elsevier B.V. All rights reserved.