Abstract
RECENTLY, Dr. Richard K. Cook1 has criticized as errors certain equations in my book2 in which mixed units occur. In particular, he points to my Eq. (1), which expresses the energy stored in a crystal upon which an arbitrary mechanical strain and an arbitrary electric field are impressed. His assertion that "the reader is therefore obliged to examine closely the origin of the formulæ he uses" would be more convincing if he had cited instances in which an incorrect conclusion has been drawn from Eq. (1). This equation is : where the c's are elastic constants at constant field, the S's are strain-components, η" is the dielectric susceptibility of the clamped crystal, E the field-strength, e a piezo-electric stress-constant, J is the mechanical equivalent of heat in ergs per calorie, is the density, C the specific heat in cal.gm.-1 deg.-1, T the absolute temperature, θ = ΔT is a small change in temperature, q is a thermo-elastic constant, and p a pyro-electric constant.
This is a preview of subscription content, access via your institution
Access options
Subscribe to this journal
Receive 51 print issues and online access
$199.00 per year
only $3.90 per issue
Buy this article
- Purchase on Springer Link
- Instant access to full article PDF
Prices may be subject to local taxes which are calculated during checkout
Similar content being viewed by others
References
Cook, Nature, 161, 524 (1948).
"Piezoelectricity" (McGraw-Hill Book Co., Inc., New York, 1946).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
CADY, W. Equations of Piezoelectricity. Nature 162, 933–934 (1948). https://doi.org/10.1038/162933b0
Issue Date:
DOI: https://doi.org/10.1038/162933b0
Comments
By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.