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Effect of Synthesis Atmosphere on the Microwave Dielectric Properties of ZnO Powders
Author(s) -
Huang Yunxia,
Cao Quanxi,
Li Zhimin,
Jiang Haiqing,
Wang Yupeng,
Li Guifang
Publication year - 2009
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.1551-2916.2009.03138.x
Subject(s) - atmosphere (unit) , hydrogen , materials science , raman spectroscopy , dielectric , microwave , analytical chemistry (journal) , nitrogen , permittivity , oxygen , particle (ecology) , particle size , chemistry , environmental chemistry , optics , organic chemistry , physics , oceanography , optoelectronics , quantum mechanics , thermodynamics , geology
ZnO powders were prepared via the solid‐state reaction at 800°C in air, nitrogen, and hydrogen atmospheres, respectively. Raman spectra show that the concentration of oxygen vacancies greatly increases when the sample is prepared in hydrogen atmosphere. The particle size distributions of the powders prepared in air and nitrogen atmospheres are better than that in hydrogen atmosphere. The dielectric parameters of the samples were determined in the frequency range of 8.2–12.4 GHz. Results show that the real part ɛ′ and imaginary part ɛ″ of complex permittivity of the sample prepared in hydrogen atmosphere reveal the greatest values in three samples. The loss mechanism of the samples was discussed.