O'Neill, Hugh; Scott, Dean
Synthetic qandilite (Mg2TiO4) is an inverse spinel in which random mixing of Mg and Ti on the octahedral site should give rise to a configurational entropy of 11.5 J K-1 mol -1. The free energy of formation of Mg2TiO 4 has been determined from the location of the univariant reaction MgTiO3 + MgO = Mg2TiO 4 in pressure-temperature space between 0 and 20 kbar; together with literature data for MgTiO3 and MgO, the results give S(98K)0 = 111.2 ± 0.6 J K-1 mol-1 for Mg2TiO4. This entropy is only 7.6...[Show more]
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