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Palladium Chromium Film Electrodes for High Temperature Acoustic Measurements

IP.com Disclosure Number: IPCOM000076869D
Original Publication Date: 1971-Jul-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Hoechli, UT: AUTHOR [+2]

Abstract

To investigate materials at temperatures up to 600 degrees C by ultrasound up to frequencies of 100 MHz, conventional electrodes are not usable due to mechanical destruction or chemical instability.

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Palladium Chromium Film Electrodes for High Temperature Acoustic Measurements

To investigate materials at temperatures up to 600 degrees C by ultrasound up to frequencies of 100 MHz, conventional electrodes are not usable due to mechanical destruction or chemical instability.

Stable electrodes are constructed by a sandwich structure of a 300 angstroms Cr film plus about 2000 angstroms Pd on top.

Fig. 1 shows an ultrasonic transducer provided with Pd-Cr sandwich film electrodes. If made of Li Nb O(3) it is operable to at least 600 degrees C. The transducer is bonded mechanically to the sample to be investigated. One of the electrodes is grounded, the other is connected to a pulsed RF generator.

Fig. 2 shows an alternate arrangement which facilitates mounting of the sample and grounding. Here the sample is clad with the Cr-Pd sandwich film. The transducer is bonded to the metallized sample surface which serves as grounded electrode. The other electrode is built by a Cu plate in loose mechanical contact with the transducer.

The sandwich films are made by vacuum deposition. Cr and Pd are evaporated from tantalum and tungsten boats, respectively, by current heating in a few seconds.

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