optics - Langasite wafer

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Langasite Wafers

Product Description:

Langasite crystal (La3Ga5SiO14), space group P321 and point group 32, is a promising new piezoelectric material for fabrication of surface acoustic wave (SAW) and bulk acoustic wave (BAW) devices. It processes some great properties such as high electromechanical coupling factor, no phase transition from room temperature to melting point and exceptional frequency-temperature characteristics. It has been reported that devices made of Langasite crystal could be used at a high temperature up to 900°C due to its excellent thermal stability.

	Crystal Structure		Trigonal
	lattice constant (Å)		a = 8.1674, c = 5.0964
	Density (g/cm^3)		5.746
	Electromechanical Coupling Factor (K_emc, % BAW)		15.8
	Frequency Spacing (Δf, %)		0.9
	Relative Dielectric Constant		ε^T₁₁ /ε_o= 18.96, ε^T₃₃ /ε_o= 50.19
	Piezoelectric charge coefficients(pC/N)		d₁₁= 5.66, d₄₄ = -5.48
	Q-Factor (X10³)		50
	Temperature Frequency Coefficient (TFC, X10⁶/°C)		420 ~ 5200
	Electromechanical Coupling Cofficient (K², % SAW)		0.36
	Elastic Stiffness (10¹¹ Pa)		c₁₁= 1.898, c₁₂ = 1.058, c₁₃ = 1.022 c₁₄= 0.144, c₃₃ = 2.626, c₄₄ = 0.535
	Table 1: Langasite crystal Properties