By Topic

New Low-Coefficient Synthetic Piezoelectric Crystals for Use in Filters and Oscillators

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

1 Author(s)
W. P. Mason ; Bell Telephone Laboratories, Murray Hill, N.J.

Two crystals of the monoclinic sphenoidal class have been found which have modes of vibration with zero temperature coefficients of frequency, high electromechanical coupling constants, and high Q's or low dissipation. These properties make it appear probable that such crystals may have a considerable use in filters and oscillators as a substitute for quartz, which is difficult to obtain in large sizes. These crystals are ethylene diamine tartrate (EDT) having the chemical formula C6H14N2O6, and di-potassium tartrate (DKT) having the formula K2C4H4O6-1/2 H2O. The paper describes the properties of EDT, since this crystal has been found more advantageous than DKT. The 13 elastic constants, the 8 piezoelectric constants, and the 4 dielectric constants have been measured over a temperature range, and from these measurements the regions of low temperature coefficients and high electromechanical coupling have been located. Six low-temperature-coefficient cuts have been discovered and the properties of these cuts are given. These cuts are being applied in the crystal channel filters of the long-distance telephone system, and may be applied to the control of oscillators.

Published in:

Proceedings of the IRE  (Volume:35 ,  Issue: 10 )