Abstract
Abstract Wavevector reversed ultrasound (electroacoustic echoes) has been developed into a new tool in ultrasonic investigations of phase transitions where sample inhomogeneity and nonparallelism often cause severe wave front distortion in conventional pulse reflection measurements. Echoes generated in Bi12GeO20 are used in an experimental study of the 185K structural transition in KMnF3 and are shown to overcome all interference effects otherwise present in reflection measurements.
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