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Table 1 Hardness and thermal expansion values

From: Development of phosphors with high thermal stability and efficiency for phosphor-converted LEDs

Material Hardness, GPa Thermal expansion, 10−6/K
SiC 24.5-28.2 ~3
Si3N4 16-20 2.8-3.2
YAG 13.6 ~2
Silicates 9-13 3.3-7