YAG Yttrium aluminum garnet is an artificial compound without natural minerals.

Yttrium aluminum garnet is an artificial compound without natural minerals. Homogeneous body with high hardness. Before 1960, colorless and transparent yttrium aluminum garnet was used as a substitute for diamonds. However, its refractive index is too low, and the finished product is far less beautiful than diamonds. Since the later production of substitutes with properties closer to diamonds, such as gadolinium gallium garnet, yttrium aluminum garnet is no longer used to grind fake diamonds, except as a cheap substitute for other gemstones.

Yttrium aluminum garnet YAG
Molecular weight: 593.7
Melting point: 1950 ℃
Density: 4.55 g/cm ³
Appearance: cubic crystal
Application: YAG coating

Yttrium aluminum garnet, used for synthesizing alumina crystals to generate laser beams.
Composition Y3AI5O12
Hardness 8-8.5
Thermal conductivity 0.14W/cmK 0.725 atomic%
Specific heat 88.8J/gK 0.725 atomic%
Thermal diffusion 0.050cm2/s 0.725 atomic%
Expansion coefficient 6.9 × 10-6/0C 0.725 atomic%
Refractive index 1.823 0.725 atomic%
Dielectric constant 11.7 0.725 atoms [w1]%
When the color is pure, it is colorless, and when neodymium is added, it is pink purple
Light absorption 0.2%/cm
Chemical properties insoluble in H2SO4HNO3, HF, soluble in H3PO4>250 ℃
PbO PbF2>556 ℃
Elastic modulus C1133.32 × 1011 dyne/cm2
C1211.07 × 1011 dyne/cm2
C1411.05 × 1011 dyne/cm2
Bulk modulus of elasticity 18.5 x 1011 dynes/cm2
Poisson's ratio 0.25-0.27
Chemical enterprises use YAG as a coating to protect the base material during cleaning

 

Yttrium aluminum garnet (YAG) crystals belong to the cubic crystal system, which is isotropic and has excellent optical and thermodynamic properties. Its mechanical properties and chemical stability are similar to those of sapphire crystals, without the birefringence effect of sapphire crystals; Pure YAG crystals have a high transmittance in the 0.25-5um region and no absorption in the 2-3um region, while the glass has a strong H2O absorption band in this region. Therefore, undoped pure YAG crystals are a new type of substrate and window material for UV and infrared optical devices. At the same time, the excellent physicochemical and optical properties of YAG crystals make them important optical crystal materials for applications in high-temperature and high-energy physical environments.