Characterization of microwave processed ZnO

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:269941

Martin, L P; Rosen, M ^[1]; Gershon, D; Levush, B ^[2]

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1. Johns Hopkins Univ., Baltimore, MD (United States)
2. N.R.C.N., Beer Sheva (Israel); and others

ZnO samples were prepared by microwave and conventional sintering processes using identical time-temperature profiles. Comparison of post-sintering ultrasonic properties as a function of residual porosity over the range of 0-35% indicated no difference in the velocity-porosity relations for the samples prepared by the two techniques. An empirical model was fit to the ultrasonic velocity and elastic moduli data. The real and imaginary parts of the permittivity of the samples processed by the two techniques possessed similar frequency dependence. In both cases there was an increase in the measured permittivity values with decreasing porosity, however the microwave sintered samples had considerably higher values. The crystallographic features and the morphology of the samples were inferred from XRD and SEM examination, respectively. It was observed that there was significantly more densification at 850{degrees}C for microwave sintering than for conventional sintering.

• DOE Contract Number: FG02-94ER12140
• OSTI ID: 269941
• Report Number(s): CONF-9505249--
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ELASTICITY
FREQUENCY DEPENDENCE
MICROWAVE HEATING
MORPHOLOGY
PERMITTIVITY
POROSITY
PROCESSING
SCANNING ELECTRON MICROSCOPY
SINTERING
X-RAY DIFFRACTION
ZINC OXIDES