Abstract
Thermal expansion measurements on synthetic orthorhombic Mg-cordierite (“low cordierite”), Mg2Al4Si5O18, were carried out with a high-temperature X-ray Guinier camera. The measurements confirm previous studies reporting low thermal expansion and suggesting a closer relationship with ring rather than framework silicates. No indication for structural modifications correlated with symmetry changes was observed. However, two discontinuities in the thermal expansion function at 275±25° and 600±50° C were detected and are assumed to represent higher-order phase transitions. The first discontinuity is related to a minimum in specific volume, implying unusual expansion behavior (negativ thermal coefficient) at low temperatures. An estimate of the dP/dT-slope of the established discontiniuties yields a positive sign for the one at 275° C and a negative one for that at 600° C.
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