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Effects of Crystal Structure on the Microwave Dielectric Properties of ABO 4 ( A = Ni , Mg , Zn and B = Mo , W ) Ceramics
Author(s) -
Kim Eung Soo,
Jeon Chang Jun,
Clem Paul G.
Publication year - 2012
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.1551-2916.2012.05274.x
Subject(s) - monoclinic crystal system , ionic bonding , triclinic crystal system , valence (chemistry) , chemistry , analytical chemistry (journal) , crystal structure , dielectric , ionic radius , crystallography , ion , materials science , organic chemistry , optoelectronics
The dependence of microwave dielectric properties on the crystal structure, bond character, and electronic characteristics of AMoO 4 and AWO 4 ( A = Ni , Mg , Zn ) ceramics was investigated. The dielectric constant ( K ) of specimens was principally affected by the dielectric polarizabilities, molar volume, and electronic oxide polarizabilities. MgMoO 4 and AWO 4 ( A = Ni , Mg , Zn ) display a single phase monoclinic wolframite structure, whereas ZnMoO 4 is a single phase triclinic wolframite structure. The quality factor ( Qf ) of AWO 4 was higher than that of AMoO 4 ( A = Mg , Zn ); these results were attributed to the packing fraction due to effective ionic size. The temperature coefficient of the resonant frequency ( TCF ) of the specimens was dependent on the cations' bond valence between the cation and oxygen ions. This suggests the ability to tailor ABO 4 microwave K , Qf , and TCF via ionic design rules.