LGT (Lanthanum Gallium Tantalate) Crystal
Keywords:
Scintillation Crystals
- Product Introduction
- Key advantages
- Application areas
- Product Features
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- Commodity name: LGT (Lanthanum Gallium Tantalate) Crystal
LGT (Lanthanum Gallium Tantalate) Crystal is a new type of non-ferroelectric piezoelectric material with a range of unique physical and chemical properties.
Product Introduction
LGT (Lanthanum Gallium Tantalate) Crystal is a novel non-ferroelectric piezoelectric crystal with a unique set of physical and chemical properties. It belongs to the trigonal crystal system, with space group P321 and point group 32. Compared to conventional synthetic quartz, LGT boasts a high electromechanical coupling coefficient, exhibits no phase transition from room temperature up to its melting point (~1470°C), features high resistivity, and lacks pyroelectric behavior—among other advantageous characteristics.
LGT crystals can be prepared using methods such as the Czochralski process, making high-quality crystals readily available. They exhibit high piezoelectric constants and a favorable electromechanical coupling coefficient, while also demonstrating excellent thermal stability. These outstanding properties give LGT crystals broad application potential in fields like electronics, optics, and sensing. For instance, they can be used to fabricate intermediate-frequency filters, high-temperature sensors, surface acoustic wave (SAW) devices, acoustic resonators, and piezoelectric sensors, among other applications.
Key advantages
- High electromechanical coupling coefficient
- No phase-change properties
- High resistivity
- Excellent piezoelectric properties
- Excellent optical properties
- Easy to prepareApplication areas
- Intermediate frequency filter
- High-temperature sensor
- Surface acoustic wave (SAW) devices
- Acoustic resonator
- Piezoelectric sensor
- Nonlinear optical devicesProduct Features
Material Properties
Chemical Formula
LGT, La₃Ga₅.₅Ta₀.₅O₁₄
Crystal Structure
Triclinic
Density
6.13 g/cm³
Mohs Hardness
6.5 Mohs
Resistivity
1.5×10⁸ Ω·cm at 540°C
Lattice Constant
a=8.228 Å,c=5.129 Å
Thermal Expansion Coefficient
a₁₁=6.087×10⁻⁶/°C; a₃₃=3.827×10⁻⁶/°C
Piezoelectric Constants
-d₁₁=6.5 pC/N; d₁₄=4.7 pC/N
Young's Modulus
YE11=11×10¹⁰ N/m²
Electrode Material
Au (chrome flash gold)
Melting Point
1470°C
Product Processing Indicators
Effective Aperture
>90%
Dimensional Tolerance
(W±0.1 mm) × (H±0.1 mm) × (L±0.2 mm)
Chamfer
≤0.2×45°
Surface Quality
20-10 S-D
Flatness
≤λ/10@632.8 nm
Parallelism
<30"
Perpendicularity
≤15′
Chipped Edge
<0.1 mm
Coating
Customized to Customer Specifications
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- Strong electro-optic effect: Ideal for high-speed optical modulation.
- High dielectric constant: Beneficial for surface acoustic wave and ultrasonic sensor applications.
- Excellent thermal stability: Suitable for high-temperature environments.
- Wide optical transparency range: Exhibits excellent light transmission across wavelengths from ultraviolet to mid-infrared.
- High sensitivity
- Wide range of transparency
- Not easily deliquescent -
- Optical communication: Used in electro-optic modulators and optical switches.
- Precision sensing: Applied in accelerometers, temperature sensors, and more.
- Laser technology: Used in laser frequency doublers, modulators, and more.
- Medical devices: Piezoelectric sensors used in ultrasound equipment.
- Surface acoustic wave devices: such as wireless filters and delay lines.
- Optical storage, transient recording
- High-speed holographic camera -
Material Properties Lattice constant a = 5.154 Å, c = 13.783 Å Density 7.45g/cm3 Color Colorless Mohs Hardness 5.5–6 on the Mohs scale Through the range 400–5000 nm Resistivity 1015wm
Dielectric constant es11/e0:39~43 es33/e0:42~43 et11/e0:51~54 et33/e0:43~46 Coefficient of thermal expansion aa = 1.61 × 10⁻⁶/K, ac = 4.1 × 10⁻⁶/K Refractive index no = 2.176, ne = 2.180 (@633 nm) Electro-optic coefficient r33 = 30.4 pm/V Heat Capacity (Cp) 100 J/k.mol Curie Temperature 610°C Melting point 1650°C Product Processing Metrics Effective Aperture >90% Dimensions Customized to customer specifications Diameter Tolerance +0 / -0.05 mm Dimensional Tolerance ±0.05 mm Protective Chamfer ≤0.2 × 45° Surface finish 10-5 S-D Flatness ≤λ/6 @ 632.8 nm Parallelism <20" Verticality ≤15′ Chipped edge < 0.1 mm Coating Customized to customer specifications
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