caa a22 4500 378890034 CHVBK 20180305123452.0 cr unu---uuuuu 161128e20040601xx s 000 0 eng 10.1524/zkri.219.6.324.34635 doi (NATIONALLICENCE)gruyter-10.1524/zkri.219.6.324.34635 High-pressure behavior of sillimanite and kyanite: Compressibility, decomposition and indications of a new high-pressure phase [Elektronische Daten] [Alexandra Friedrich, Martin Kunz, Björn Winkler, Tristan Le Bihan] The high-pressure behavior of the two Al2SiO5 polymorphs sillimanite and kyanite was investigated up to 46 and 53 GPa, respectively, using a diamond-anvil cell and powder X-ray synchrotron diffraction. The bulk moduli of sillimanite and kyanite obtained from a fit to a second-order Birch-Murnaghan equation of state are B0 = 176(11) GPa and B0 = 190(3) GPa at fixed B′ = 4, respectively. The samples were laser annealed several times at high pressures. After laser annealing at 46 GPa, sillimanite was decomposed into its oxide components corundum (Al2O3) and stishovite (SiO2). The high-pressure behavior of kyanite, however, is more complicated. Up to 20 GPa, kyanite remains stable. At 30 GPa a new high-pressure form is observed, which seems to be structurally related to kyanite. After laser heating, it partly decomposed into corundum and stishovite. However, when laser heating at much higher pressures of 47 to 53 GPa, the new phase remains stable. © 2004 Oldenbourg Wissenschaftsverlag GmbH Crystallography nationallicence Inorganic chemistry nationallicence Organic chemistry nationallicence Friedrich Alexandra aut Kunz Martin aut Winkler Björn aut Le Bihan Tristan aut Zeitschrift für Kristallographie - Crystalline Materials De Gruyter Oldenbourg 219/6(2004-06-01), 324-329 2194-4946 219:6<324 2004 219 zkri https://doi.org/10.1524/zkri.219.6.324.34635 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1524/zkri.219.6.324.34635 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Friedrich Alexandra aut NATIONALLICENCE 700 1- Kunz Martin aut NATIONALLICENCE 700 1- Winkler Björn aut NATIONALLICENCE 700 1- Le Bihan Tristan aut NATIONALLICENCE 773 0- Zeitschrift für Kristallographie - Crystalline Materials De Gruyter Oldenbourg 219/6(2004-06-01), 324-329 2194-4946 219:6<324 2004 219 zkri CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter