The formation of V{sub 1{minus}x}W{sub x}O{sub 2} thermochromic films by reactive magnetron sputtering with an alloy target
- National Industrial Research Inst. of Nagoya (Japan)
- Daido Inst. of Technology, Nagoya (Japan)
Thermochromic (TC) materials are those of which the optical properties (transmittance, reflectance, absorptance, etc.) being able to change reversibly upon temperature. Such materials have recently received increasing attention in glass manufactures, because that the windows of buildings and vehicles with TC coating have the potential of realizing an automatic control of the solar energy throughputs in the NIR and IR region as well as the environmental radiative throughputs in response to the ambient temperature. The transition temperature {tau}{sub c} of the V{sub 1{minus}x}W{sub x}O{sub 2} films deposited by dual-target sputtering was precisely determined from the changes both in IR transmittance and in electrical resistivity against temperature. The relationship between x(0--0.026) in V{sub 1{minus}x}W{sub x}O{sub 2} and {tau}{sub c} (0--67 C) in the most applicable range for window coatings was clarified and a {tau}{sub c} reduction efficiency of 23 C/at.%W was again confirmed. The V{sub 1{minus}x}W{sub x}O{sub 2} films containing the desired tungsten doping amount were fabricated with reproducibility by sputtering of a V-W(1.6at.%) alloy target under optimal conditions. The {tau}{sub c} reduction efficiency for the films deposited using alloy target is almost identical of that for the films deposited by dual-target sputtering. The V{sub 1{minus}x}W{sub x}O{sub 2} films deposited using alloy target showed thermochromism comparative to those previously prepared by dual-target sputtering.
- OSTI ID:
- 197604
- Report Number(s):
- CONF-950793--; ISBN 0-8194-1890-0
- Country of Publication:
- United States
- Language:
- English
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