Permittivity, dielectric loss tangent, radial coupling coefficient, and radial frequency constant have been measured as a function of composition for pressure-sintered Li,rNa,-,NbO, in the range 0.015~xS0.15. An anomaly in each of these properties when plotted as a function of composition is associated with a structural transition between 2 ferroelectric phases; this transition lies near room temperature for compositions where x ~0 . 1 2 . Compositions near this phase boundary exhibit room-temperature properties which are of interest for highfrequency filter applications.
Pressure-sintered Li x Na i _ x Nb0 3 in the range 0.015 ~ x ~ 0.15 exhibits electromechanical properties amenable to high-frequency device applications with radial-frequency constants fR(r) between 1.75 and 1.95 kHzm, coupling coefficients up to 0.4, and permittivities between 100 and 200. The temperature and time dependencies of fR are shown to be strongly related to composition, where for x = 0.12, the temperature coefficient between -40 and 80°C is -2X 1O-4°C -i and the ageing coefficient is -2.5X 10-3 per decade. The results are discussed in relation to composition and with respect to anomalies at phase transitions in (Li,Na)Nb0 3 .
Strains in thin epitaxially grown films resulting mainly from the difference in the coefficients of thermal expansion between film and substrate have been measured using an x-ray double-crystal diffractometer. The measured strains are in agreement with those predicted from known thermal expansion data. Tensile stresses of about 6.SX1()9 dyn/cm 2 parallel to the surface have been found at room temperature in a film deposited at 122SoC.
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