| 摘要 |
<p>Disclosed is a composite substrate provided with a piezoelectric substrate, a support substrate made of spinel, and an organic adhesive layer for adhering the piezoelectric substrate and the support substrate, wherein the support substrate comprises an adhesive surface to be adhered to the piezoelectric substrate and the adhesive surface has an Rt (maximum cross sectional height of a roughness curve) of 5 nm or more and 50 nm or less.</p> |
