Piezoelectric and Dielectric Properties of Ceramics in the System Potassium—Sodium Niobate

Journal of the American Ceramic Society - Tập 42 Số 9 - Trang 438-442 - 1959
L. Egerton1, DOLORES M. DILLON1
1Bell Telephone Laboratories, Incorporated Murray Hill, New Jersey

Tóm tắt

High radial coupling coefficients are observed for compositions having up to 50 mole % sodium niobate additions to potassium niobate. The activity diminishes with additional sodium niobate content and disappears beyond about 98 mole % additions. Dielectric constants are relatively low, varying from 450 to 125, depending on composition. A.‐c. losses are high and d.‐c. resistivities are ∼1012ohm‐cm. The low dielectric constants and high coupling obtained in certain regions of the system make these materials promising for solid ultrasonic delay line use, especially where thin sectioned plates are required, as in high‐frequency thickness extensional or thickness shear mode transducers.

Từ khóa


Tài liệu tham khảo

May T. E., 1956, Ultrasonic Delay Lines, Bell Labs. Record, 35, 212

10.1103/PhysRev.82.727

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10.1021/ja01585a008

Mason W. P., 1950, Piezoelectric Crystals and Their Application to Ultrasonics, 292

10.1109/JRPROC.1954.274752

Shirane G., 1955, Some Aspects of Ferroelectricity, Proc. Inst. Radio Engrs., 43, 1738

10.1103/PhysRev.96.581

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Thông tin xuất bản

Journal of the American Ceramic Society

Tập 42 Số 9

438-442

Thông tin tác giả