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1 Labor für Kristallographie, ETH Zentrum, Sonneggstrasse 5, CH-8092 Zürich
2 Bayerisches Geoinstitut, Universutät Bayreuth, D-95440 Bayreuth*
3 Labor für mineralogische und chemische Kristallographie, Freiestrasse 3, CH-3012 Bern
Correspondence: * E-mail: kunz{at}kristall.erdw.ethz.ch
A set of powder diffraction data was collected for synthetic titanite (CaTiOSiO4) at simultaneously high pressures and high temperatures in a P-T field between 275 K to 650 K and room pressure to 4.9 GPa, respectively. With these data it was possible to relate the A2/a high-pressure phase at >3.5 GPa (room temperature) to the A2/a high temperature phase observed above 825 K (room pressure). The slope of the phase transition is –180 K/GPa. The data also allowed the extraction of P-V-T equations of state with the following parameters: for P21/a: K298,0 = 113.4(3), (
KT,0/T)P = –0.061(3) GPa/K, V298,0 = 369.04(2) Å3, 
0 = 2.07(5)/105 K. For A2/a: K298,0 = 135.2(2), (KT,0/T)P = –0.073(1) GPa/K, V298,0 = 367.12(2) Å3, 0 = 2.8(2) / 105 K, where K is bulk modulus, V is volume, and is thermal expansivity. A structural analysis based on Rietveld refinements revealed that the polymerized CaO7 polyhedra dominantly affect the structural response to changing pressure and temperature. The TiO6 octahedra rotate almost rigidly in response to the compression of the CaO7 polyhedra with which they share edges. The SiO4 tetrahedra show a strong angular distortion with only little change in bond lengths.
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