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How do rare earth elements improve the impact toughness of synthetic diamonds?
Release time：
2026-05-11
source：
Reducing impurities and defects, lowering internal stress: The addition of rare earths can reduce the impurity content and internal defects in diamonds. This reduces or eliminates the internal stress generated by the expansion of bubbles, slag inclusions, or wrapped inclusions during high-temperature heating, thereby preventing the diamond from developing cracks, micro-cracks, oxidation, or voids.
Stabilizing surface structure: The carbon atoms on the diamond surface have unused "dangling bonds" that easily react with electron-deficient oxygen atoms, causing oxidation. Since rare earth elements have three valence electrons that are easily lost, these electrons can combine with the carbon dangling bonds to form covalent bonds. This eliminates excess valence electrons on the diamond surface, stabilizing its originally unstable surface structure and thereby improving its high-temperature oxidation resistance and strength.
Micro-alloying effect: Rare earth elements may also produce a micro-alloying effect within the diamond, further perfecting its crystal structure.
Enhancing catalytic action: Rare earths are highly chemically active, and many of their compounds act as highly active catalysts. Under high temperature and high pressure, they participate in the reaction together with the catalyst alloy, enhancing the catalytic action. This provides favorable conditions for the nucleation and growth of diamond crystals, making the crystals grow uniformly with better properties.
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