Ultrasonic delay material

Details Ultrasonic delay material Ultrasonic delay material

1974-08-30

1976-06-01

Smith, Alfred E.

Wave transmission lines and networks

Coupling networks

With impedance matching

310 98, H03H 926, H03H 930

Patent

active

039612899

ABSTRACT:
A spinel-type oxide exhibiting a cooperative Jahn-Teller effect shows an extraordinary reduction of sound velocity therethrough at temperatures near the Jahn-Teller phase transition temperature thereof. The sound velocity and effective temperature range can be varied over wide ranges by using a solid solution of such an oxide and another spinel-type oxide not exhibiting the Jahn-Teller effect. NiCr.sub.2 O.sub.4 and ZnCr.sub.2 O.sub.4 are particularly advantageous as the former and latter oxides, respectively.

REFERENCES:
patent: 3296555 (1967-01-01), Fraser
patent: 3387233 (1968-06-01), Parker, Jr.
Rodrigue, "Magnetoelastic Waves - New Mechanisms for Energy Transport" in IEEE spectrum, June 1965; pp. 81-85.

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