Improving Levine model for dielectric constants of transition metal compounds
The density of states and optical properties of several transition metal compounds have been simulated using local density approximations+U. Results show that s electrons of nontransition elements in ...
The density of states and optical properties of several transition metal compounds have been simulated using local density approximations+U. Results show that s electrons of nontransition elements in ...
Electrocaloric effect in BaTiO3 thin films
The modified transverse Ising model taking into account the four-spin exchange interaction and quantum fluctuation, as well as the mechanical constraint of the substrate, is constructed and applied to...
The modified transverse Ising model taking into account the four-spin exchange interaction and quantum fluctuation, as well as the mechanical constraint of the substrate, is constructed and applied to...
Impact of a surface laser treatment on the dielectric strength of 
-alumina
J. Appl. Phys. 106, 094103 (2009); doi:10.1063/1.3253731
Published 3 November 2009
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The impact of laser treatments on the dielectric strength of -alumina is investigated. In order to induce low surface modifications to strong damages, different laser processing parameters (fluence, assisting gas and its pressure, and laser wavelength) are applied. The experimental results clearly show that the dielectric strength is not really affected by the laser induced surface modifications. Surface cracks are consequently not considered to be involved in the breakdown mechanism. If any relationship exists between mechanical and dielectric strengths of -alumina, the assumption considering that the prebreakdown event is the propagation of a mechanical crack from the surface has to be reconsidered.
©2009 American Institute of Physics
-alumina is investigated. In order to induce low surface modifications to strong damages, different laser processing parameters (fluence, assisting gas and its pressure, and laser wavelength) are applied. The experimental results clearly show that the dielectric strength is not really affected by the laser induced surface modifications. Surface cracks are consequently not considered to be involved in the breakdown mechanism. If any relationship exists between mechanical and dielectric strengths of -alumina, the assumption considering that the prebreakdown event is the propagation of a mechanical crack from the surface has to be reconsidered.
©2009 American Institute of Physics
| History: | Received 20 July 2009; accepted 26 September 2009; published 3 November 2009 |
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http://link.aip.org/link/?JAPIAU/106/094103/1 |
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0021-8979 (print)
1089-7550 (online)
AIP
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