Characteristic

Yttrium boride refers to a crystalline material composed of different proportions of yttrium and boron, such as YB₂, YB₄, YB₆, YB₁₂, YB₂₅, YB₅₀ and YB₆₆. They are all gray-colored, hard solids having high melting temperatures. The most common form is the yttrium hexaboride YB6.

Chemical formula：YB₆₆/YB₅₀/YB₂₅/YB₁₂/YB₆/YB₄/YB₂

Molar mass： 153.77

Appearance： Gray-Black powder, Metallic

Density： 2.52 g/cm³ --- YB66   2.72 g/cm³ --- YB50   3.02 g/cm³ --- YB25   3.44 g/cm³ --- YB12   3.67 g/cm³ --- YB6   4.32 g/cm³ --- YB4

Melting point： 2,750–2,000 °C (4,980–3,630 °F; 3,020–2,270 K)

Solubility in water：Insoluble

Crystal structure：cubic, cP7