LGS Crystals 

Simple description：

The chemical formula of lanthanum gallium silicate is La3Ga5SiO14, and its crystal structure is trigonal. has a high density (about 5.75g/cm³, some data is 5.754g/cm³), a high melting point1470℃), and a high Mohs hardness (about 6.5, some data is 6.6). These physical properties make lanum gallium silicate exhibit good stability and durability in various application environments.

Detailed Description：

LGS is a versatile crystalline material with excellent piezoelectric and electro-optic properties, high thermal stability, and low equivalent series resistance. Its diverse applications in electro-optic Q-switches, SAW devices, BAW devices, and high-temperature sensors demonstrate its significant value and potential in various fields.

Advantages：

1. High Thermal Stability: LGS exhibits high thermal stability, with a melting point of 1470°C and no phase transitions from room temperature to its melting point. This makes it suitable for use in high-temperature environments without degradation or loss of performance.
2. Low Thermal Expansion Coefficient: LGS has a low thermal expansion coefficient, which means that its size changes minimally with temperature variations. This characteristic is beneficial for maintaining the stability and accuracy of devices.
3. High Damage Threshold: LGS possesses a high damage threshold, allowing it to withstand high light intensities or electric field strengths without undergoing destruction. This makes it suitable for applications involving high-power lasers or electric fields.
4. Excellent Electro-optic Performance: LGS has two independent electro-optic coefficients that are stable over a wide temperature range. This makes it an excellent material for electro-optic effects, such as in electro-optic Q-switches.
5. Good Piezoelectric Properties: As a piezoelectric material, LGS exhibits significant piezoelectric effects with high piezoelectric constants and electromechanical coupling coefficients. This makes it ideal for the manufacture of surface acoustic wave (SAW) devices, bulk acoustic wave (BAW) devices, and other piezoelectric devices.
6. Good Chemical and Physical Stability: LGS is resistant to hydrolysis and exhibits good chemical and physical stability, making it suitable for use in various complex environments.
7. Customizable: The size, shape, and cutting direction of LGS crystals can be customized according to customer requirements, providing flexibility for specific applications.

Application fields：

1. Electro-optic Q-switch: Lanthanum gallate can be used to make electro-optic Q-switches, whose performance can rival of DKDP crystal Q-switches. Electro-optic Q-switches have wide applications in the field of lasers, such as laser ranging, lidar, and communication.
2. Surface Acoustic Wave (SAW) Devices: The high electromechanical coupling coefficient and piezoelectric constant of lanthanum galliumicate make it an ideal material for fabricating SAW devices. SAW devices have extensive applications in mobile communications, wireless sensor networks, and the Internet of Things.
3. Bulk Acoustic Wave (BAW) Devices: Lanthanum gallium silicate is also suitable for the fabrication of BAW devices.AW devices have potential applications in filters, resonators, and sensors.
4. High-power all-solid-state laser: Lanthanum gallium silicate also has potential applications in the field of lasers, and can be used make key components in high-power all-solid-state lasers.
5. High-temperature sensors: Due to its high thermal stability, lanthanum gallate can be used to make high-temperature sensors for monitoring parameters as temperature and pressure in high-temperature environments.

Specifications:

Parameter Category	Parameter Name	Value/Description
Basic Physical Parameters	Chemical Formula	La3Ga5SiO14
	Crystal Structure	Trigonal System
	Density	5.75 g/cm³ (or 5.754 g/cm³)
	Melting Point	1470 ℃
	Mohs Hardness	6.5 (or 6.6)
Electrical Parameters	Dielectric Constant (ε11/ε0)	19.87
	Dielectric Constant (ε33/ε0)	51.24
	Resistivity	>1×10¹² Ω·cm (at 25℃)
	Piezoelectric Strain Constant (d11)	6.45
	Piezoelectric Strain Constant (d14)	-4.86
	Piezoelectric Stress Constant (e11)	-0.38~-0.42 (or -0.44, 0.43 in some data)
	Piezoelectric Stress Constant (e14)	0.08~0.12 (or 0.10 in some data)
	Electromechanical Coupling Factor	0.38%
Other Parameters	Thermal Expansion Coefficient (α11)	5.8×10⁻⁶/K
	Thermal Expansion Coefficient (α33)	3.9×10⁻⁶/K
	SAW Velocity	2723 m/sec
	BAW Frequency Constant	1380 KHz/mm
Other Characteristics	Crystal Cut Types	Customizable based on requirements, such as X, Y, Z, (0,138.5,27), (0,22,90), etc.
	Growth Method	Czochralski method, etc.
	Application Areas	Electro-optic Q-switches, SAW devices, BAW devices, high-power solid-state lasers, high-temperature sensors, etc.