Temperature Compensated Piezoelectric Oxide Materials.
Abstract
In order to search for new temperature compensated materials for surface acoustic wave (SAW) devices with low ultrasonic attenuation and high electromechanical coupling, the following investigations were carried out: (1) Crystal growth for lead potassium niobate (PKN), Pb2KNb5O15 and for lithium metasilicate, Li2SiO3 by using the Czochralski method; (2) The complete set of elastic, dielectric and piezoelectric constants and of their temperature coefficients is reported for unpoled PKN; (3) The piezoelectric strain constants d(11) and d(14) of alpha-berlinite have been measured by the static x-ray method. The piezoelectric stress constants e(11) and e(14) calculated from these results are larger than the values previously determined ultrasonically; (4) The dielectric constant and the loss tangent of alpha-berlinite were measured from 1,000 to 1,000,000 Hz between -175 and +200 C. Two relaxation peaks are present in the loss tangent; and (5) In order to assess the reliability of the x-ray method the piezoelectric strain constants d(11) and d(14) of alpha-quartz were measured with this method. The value obtained for d(11) is in excellent agreement with the results obtained by other experimental methods. The value of d(14) obtained from the (024) reflection is about 30 percent larger than the values obtained by other methods.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1979
- Accession Number
- ADA077650
Entities
People
- G. R. Barsch
- K. E. Spear
Organizations
- Pennsylvania State University