What is the crystalline phase of high-purity boron powder?
High-purity boron powder is categorized into two types: amorphous boron powder and crystalline boron powder. Amorphous boron lacks a long-range periodic crystalline phase. For semiconductor-grade crystalline boron (such as 6N-purity crystalline boron granules), the predominant crystalline phase is β-rhombohedral boron (β-B₁₀₆).