Electronic Resource
[S.l.]
:
American Institute of Physics (AIP)
Journal of Applied Physics
72 (1992), S. 3447-3450
ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
The internal friction (IF) and elastic modulus were measured for bulk samples of nano-ZrO2 from −200 °C to room temperature. An IF peak located on a high background was found for as-compacted bulk nano-ZrO2. At the same time, a large modulus defect appeared. After annealing, the IF background decreased substantially and both the IF peak and the modulus defect disappeared. When the sample was heat treated according to the schedule 700 °C/15 h+900 °C/21 h+1100 °C/18 h, the modulus jumped a factor of 2 comparison with the modulus of an as-compacted sample. The modulus of as-compacted nano-ZrO2 was higher than that of coarse-grained ZrO2 at low temperature. The origin of the IF peak is associated with the atomic relaxation in boundaries. The dramatic increase of the modulus for the annealed nano-ZrO2 is mainly induced by the enhancement of the binding force and the decrease of the mobility of atoms and bonds in boundaries.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.351418
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