| 摘要 |
PROBLEM TO BE SOLVED: To provide a substrate for an elastic wave element whose temperature characteristic of frequency is improved by modifying a lithium tantalate crystal commonly used as an elastic wave element.SOLUTION: In a substrate for an elastic wave element comprising a lithium tantalate crystal containing one or two or more kinds of trivalent cations selected from Sc, Y and lanthanoid metals as much as 1 mol% or more, preferably, the upper limit of the content of the trivalent cations is 4 mol %, and the absolute value of temperature coefficient of its frequency is 20 ppm/°C or less. |
