Overview of Crystal Properties

Overview of Crystal Properties（Ⅰ）

Parameter\Crystal	LiNbO₃	LiTaO₃	SiO₂	Li₂B₄O₇	Bi₁₂GeO₂₀	Bi₁₂SiO₂₀
Crystal Class	Trigonal	Trigonal	Trigonal	Tetragonal	Cubic	Cubic
Point Group	3m	3m	32	4mm	23	23
Space Group	R3c	R3c	P3₁2	/4₁cd	/2₁3	/2₁3
Lattice Parameter（nm）	a 0.5184	a 0.5154	a 4.903	a 0.9479	a 0.5154	a 1.0103
Lattice Parameter（nm）	c 1.3863	c 1.3781	c 5.393	c 1.0280	a 0.5154	a 1.0103
Melting Point（ºC）	1250	1650	1713	917	930	890
Density (g/cm³)	4.64	7.46	2.65	2.45	9.2	9.2
Curie Temp.（ºC）	～ 1142	～ 605
Hardness (Mohs)	5	5.5	7	6	4.5	4.5
Dielectric Constant	ε₁₁/ε₀85	ε₁₁/ε₀51.7		ε₁₁/ε₀9.32	ε₁₁/ε₀39.4	ε₁₁/ε₀42.7
Dielectric Constant	ε₃₃/ε₀29.5	ε₃₃/ε₀44.5		ε₃₃/ε₀9.93	ε₃₃/ε₀43.4	ε₃₃/ε₀47.5
Elastic Constant (×10¹¹N/m²)	C₁₁^E 2.04	C₁₁^E 2.33		C₁₁^E 13.28	C₁₁^E 1.29	C₁₁^E 1.33
Elastic Constant (×10¹¹N/m²)	C₃₃^E 2.46	C₃₃^E 2.77		C₃₃^E 5.45	C₄₄^E 0.26	C₄₄^E 0.25
Strain Constant (×10¹¹C/N)	d₂₂ 2.04	d₂₂ 2.4		d₁₅ 8.19
Strain Constant (×10¹¹C/N)	d₃₃ 19.22	d₃₃ 0.8		d₃₃ 19.22
Stress Constant (C/m²)					e₁₄ 0.89	e₁₄ 1.01
Transparency Range (nm)					470～7500	450～7500
Electro-optic Coefficient (×10^-12m/V)					γ₄₁ 3.1	γ₄₁ 5
Refractive Index (632.8nm)					2.55	2.45
Gradient of Refractive Index (×10^-5/cm)					≤5	≤5
(632.8nm) Optic Activity (mm^-1)					Left 20º	Right 22.5º
(632.8nm) Transmittivity (%)					67	69

Overview of Crystal Properties（Ⅱ）

Parameter\Crystal	TeO₂	PbMoO₄	Bi₄Ge₃O₁₂	MgAl₂O₄	Optical LiNbO₃	Optical LiTaO₃
Crystal Class	Tetragonal	Tetragonal	Cubic	Cubic	Trigonal	Trigonal
Point Group	422	4/m	43m	4/m 3 4/m	3m	3m
Space Group	P4₁2₁2	/4₁/a	/4₁ 3d	F d3m	R3c	R3c
Lattice Parameter（nm）	a 0.4810	a 0.5435	a 10518	a 0.8085	a 0.5184	a 0.5154
Lattice Parameter（nm）	c 0.7613	c 1.2110	a 10518	a 0.8085	c 1.3863	c 1.3781
Melting Point （ºC）	730	1065	1045	2130	1250	1650
Density (g/cm³)	5.99	6.95	7.12	3.64	4.64	7.46
Curie Temp. （ºC）					～1160	～607
Hardness (Mohs)	4.5	3	5	8	5	5.5
Dielectric Constant					ε₁₁/ε₀85	ε₁₁/ε₀51.7
Dielectric Constant					ε₃₃/ε₀29.5	ε₃₃/ε₀44.5
Elastic Constant (×10¹¹N/m²)					C₁₁^E 2.04	C₁₁^E 2.33
Elastic Constant (×10¹¹N/m²)					C₄₄^E 2.46	C₄₄^E 2.77
Strain Constant (×10¹¹C/N)					d₂₂ 2.04	d₂₂ 2.4
Strain Constant (×10¹¹C/N)					d₃₃ 19.22	d₃₃ 0.8
Stress Constant (C/m²)
Transparency Range (nm)	350～5000	420～5500	350～5500		370～5000	400～5000
Electro-optic Coefficient (×10^-12m/V)			γ₄₁ 1.03		γ₄₁ 32	γ₄₁ 30.4
Refractive Index (632.8nm)	n₀ 2.260	n₀ 2.386		2.098	n₀ 2.286	n₀ 2.176
Refractive Index (632.8nm)	n_e 2.142	n_e 2.262		2.098	n_e 2.200	n_e 2.180
Gradient of Refractive Index (×10^-5/cm)	≤5	≤5			≤5	≤5
Gradient of Refractive Index (×10^-5/cm)	≤5	≤5			≤5
(632.8) Transmittivity (%)	70	70			≥68
Acoustic Velocity (m/s)	616	3600	3908	6500
Propagation Loss (dB/µs)				6.5
Excited Spectrum (nm)			305
Luminescence Spectrum (nm)			480～510
Relative Emission (%)			10～14
Critical Energy (MeV)			10.5
Acoustooptic Quality Factory (×10^-18S³/g)	M₂ 793	M₂ 36.1

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