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Dielectric Properties of Lithium Molybdate Ceramic Fabricated at Room Temperature
Author(s) -
Kähäri Hanna,
Teirikangas Merja,
Juuti Jari,
Jantunen Heli
Publication year - 2014
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/jace.13277
Subject(s) - molybdate , microstructure , materials science , ceramic , lithium (medication) , relative permittivity , dielectric , sintering , microwave , analytical chemistry (journal) , lithium nitrate , diffraction , mineralogy , permittivity , composite material , ion , chemistry , metallurgy , optics , optoelectronics , medicine , endocrinology , physics , organic chemistry , chromatography , quantum mechanics , ionic bonding
Lithium molybdate disks were fabricated by moistening water‐soluble Li 2 MoO 4 powder with deionized water and compressing it under a pressure of 130 MPa. Disks were postprocessed at room temperature, at 120°C, and at 540°C, which is a common sintering temperature for Li 2 MoO 4 . Regardless of the postprocessing temperature, densities as high as 87%–93% of the theoretical value were achieved. The X ‐ray diffraction patterns of processed disks were all the same with no signs of hydrates or constitutional water. The samples also exhibited very similar microstructures and microwave dielectric properties with a relative permittivity of 4.6–5.2 and a Q × f value of 10 200–18 500 at 9.6 GHz, depending on the postprocessing temperature.