| 摘要 |
<p>Provided is an elastic wave device: using a laminated structure having a piezoelectric film that has lithium tantalate as the main component thereof and a piezoelectric substrate that has lithium niobate as the main component thereof; and whereby the difference in linear expansion coefficients between the lithium tantalate and the lithium niobate can be reduced. The elastic wave device (1) comprises: the piezoelectric substrate (2) having lithium niobate as the main component thereof; the piezoelectric film (5) stacked directly or indirectly upon the piezoelectric substrate (2) and having lithium tantalate as the main component thereof; and electrodes (4, 6) formed on the upper surface and/or the lower surface of the piezoelectric film (5). The elastic wave device (1) has a Euler angle (f) between the lithium niobate and the lithium tantalate of 0° and is within a region (X) having ?LT and ?LN hatched in Fig. 5, when the Euler angle (?) of the lithium tantalate is ?LT, the Euler angle (?) of the lithium niobate is ?LN.</p> |
