Ultrasonic and dielectric characterization of microwave-sintered and conventionally sintered zinc oxide

Journal Article · Tue Oct 01 04:00:00 EDT 1996 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1996.tb09030.x· OSTI ID:413317

Martin, L P; Dadon, D; Rosen, M ^[1]; Gershon, D; Birman, A; Levush, B; Carmel, Y ^[2]

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1. Johns Hopkins Univ., Baltimore, MD (United States). Dept. of Materials Science and Engineering
2. Univ. of Maryland, College Park, MD (United States). Lab. for Plasma Research

Zinc oxide samples were prepared by microwave- and conventional-sintering processes using identical time-temperature profiles. Comparison of postsintering properties as a function of residual porosity over the range of 0%--35% indicated no significant difference in the ultrasonic velocity-porosity relations or the elastic moduli for the samples prepared by the two techniques. The real and imaginary parts of the permittivity of the samples processed by the two techniques were measured over a wide frequency range. In both cases, there was an increase in the measured permittivity values with decreasing porosity; however, the microwave-sintered samples had considerably higher values. Porosity levels were evaluated using bulk density measurements and scanning electron microscopy analysis. Significantly more densification was observed at intermediate temperatures for microwave sintering than for conventional sintering.

• Sponsoring Organization: USDOE
• OSTI ID: 413317
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 10 Vol. 79; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BULK DENSITY
CORRELATIONS
DIELECTRIC PROPERTIES
ELASTICITY
FREQUENCY DEPENDENCE
PERMITTIVITY
POROSITY
SAMPLE PREPARATION
SCANNING ELECTRON MICROSCOPY
SINTERING
ULTRASONIC TESTING
VELOCITY
ZINC OXIDES