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Effect of MnO on the Phase Development, Microstructures, and Dielectric Properties of 0.95Na 0.5 K 0.5 NbO 3 –0.05LiTaO 3 Ceramics
Author(s) -
Bomlai Pornsuda,
Sinsap Penprapa,
Muensit Supasarute,
Milne Steven J.
Publication year - 2008
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2007.02130.x
Subject(s) - materials science , orthorhombic crystal system , dielectric , tetragonal crystal system , analytical chemistry (journal) , sintering , lattice constant , microstructure , grain size , natural bond orbital , mineralogy , perovskite (structure) , ceramic , diffraction , crystallography , crystal structure , chemistry , metallurgy , physics , optoelectronics , chromatography , optics , density functional theory , computational chemistry
Lead‐free piezoelectric ceramics in the system 0.95Na 0.5 K 0.5 NbO 3 –0.05LiTaO 3 were modified with ≤1 mol% MnO. Maximum densities occurred at a sintering temperature of 1050°C. Characteristic changes in the relative intensity of X‐ray diffraction peaks were consistent with Mn ions substituting on the perovskite lattice to produce a change from orthorhombic to a mixture of tetragonal and orthorhombic phases. Grain growth during secondary recrystallization was also affected, leading to increased grain sizes. The dielectric constant increased from ∼600 in unmodified ceramics to ∼1040 in ceramics prepared with 0.5 mol% MnO.