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. 2023 Jan 1;23(1):464. doi: 10.3390/s23010464

Table 1.

Piezoelectric substrate materials and their $k^{2}$ .

Material	SiO₂	SiO₂	SiO₂	LiTaO₃	LiTaO₃	LiTaO₃
Direction of propagation	ST-X	42.75⁰Y-X	Y-X	Y-Z	X-112⁰Y	42⁰Y-X
$k^{2} / %$	0.14	0.16	0.23	0.66	0.75	7.6
Material	LiNbO₃	LiNbO₃	LiNbO₃	Li₂B₄O₇	Li₂B₄O₇	Li₂B₄O₇
Direction of propagation	X-112⁰Y	Z-X	128⁰Y-X	Z-X	Z-45⁰X	6.7⁰X-Z
$k^{2} / %$	0.75	2.0	5.5	0.9	1.1	1.4