Ultrasonic Anomalies in Rochelle Salt
Using a pulsing-receiving method, the velocity and attenuation of longitudinal ultrasonic waves are measured, respectively, parallel to the a-axis and c-axis of a single crystal of Rochelle salt. The measurements are carried out for the frequencies 2, 5, 10 and 15 MHz over the temperature range from −120 °C to 45 °C. In the ferroelectric range of temperature fluctuations of attenuation have been observed, and are attributed to the corresponding origins which lead to the ferroelectric anomalies in Rochelle salt. Apart from these fluctuations, a peak in attenuation has been recorded, respectively, at −99 °C, −56 °C, −5 °C and 39 °C for the four stated frequencies. The observed temperature shift with frequency, of the peak connects the concerned loss with a relaxational process characterized by an activation energy of 1590 cal/g mole. A physical origin of this process may be found in the sensitiveness to strain, of the 1-10 hydrogen bond, which results in a relaxational compressibility. The attenuation maxima thus calculated are found to be in good agreement with the heights observed experimentally.
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Document Type: Research Article
Publication date: July 1, 1972
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- Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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