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- W1499039581 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." @default.
- W1499039581 created "2016-06-24" @default.
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- W1499039581 date "2005-04-19" @default.
- W1499039581 modified "2023-09-24" @default.
- W1499039581 title "High coupling KNBO/sub 3/ width-extensional vibrators with a polar multidomain structure" @default.
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- W1499039581 doi "https://doi.org/10.1109/ultsym.2004.1417941" @default.
- W1499039581 hasPublicationYear "2005" @default.
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