Thermal Expansion Behaviour Of Boron-Doped Cordierite Glass-Ceramics

The linear thermal expansion coefficients of cordierite glass-ceramics that have been doped with a fixed amount of P205 and 1, 2 and 3 wt% of B203 show negative expansion in the temperature range of 100-300 deg C. The expansion of the undoped cordierite sample is positive. A relative decrease in the degree of negative expansion is observed as the B203 concentration increases.