NDLI: High coupling KNbO/sub 3/ width-extensional vibrators with a polar multidomain structure

Content Provider	IEEE Xplore Digital Library
Author	Koyama, H. Nakamura, K. Takano, T.
Copyright Year	2005
Description	Author affiliation: Graduate Sch. of Eng., Tohoku Univ., Sendai, Japan (Koyama, H.; Nakamura, K.)
Abstract	The longitudinal piezoelectric coupling factor for the width-extensional mode of a thin KNbO/sub 3/ plate, k/sub 11/', has theoretically been predicted to be as high as 82.4% for the 43.5/spl deg/ rotated Z-cut about the Y-axis. To confirm the predicted value experimentally, we fabricated a width-extensional vibrator using a 45/spl deg/ rotated Z-cut plate about the Y-axis, which is close to the maximum k/sub 11/' cut. However, the measured value of k/sub 11/' was 71.3%, appreciably lower than the predicted value. It is clarified that the lower coupling factor can be ascribed to the tilt of the electric field vector from the major face of the plate, which results from an off-diagonal component of the dielectric tensor. To prevent the electric field tilt, a polar multidomain structure consisting of two kinds of 90/spl deg/ domains is introduced into the width-extensional vibrator, instead of a single domain structure. It is demonstrated by FEM simulations that the coupling factor approaches the predicted value as the number of domains formed in the vibrator increases. The measured coupling factor of a width-extensional vibrator with a polar multidomain structure is as high as 79.4%, which is close to the predicted value. An additional advantage of using this domain structure is its lower spurious response.
Starting Page	1017
Ending Page	1020
File Size	673914
Page Count	4
File Format	PDF
ISBN	0780384121
ISSN	10510117
DOI	10.1109/ULTSYM.2004.1417941
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-08-23
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Piezoelectric materials Tensile stress Predictive models Ultrasonic variables measurement Ultrasonic transducers Crystals Dielectric measurements Vibration measurement Ferroelectric materials Niobium compounds
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in