caa a22 4500 378890050 CHVBK 20180305123452.0 cr unu---uuuuu 161128e20040601xx s 000 0 eng 10.1524/zkri.219.6.314.34639 doi (NATIONALLICENCE)gruyter-10.1524/zkri.219.6.314.34639 The effects of pressure, temperature and composition on the crystal structures of α-quartz homeotypes [Elektronische Daten] [Julien Haines, Olivier Cambon] α-Quartz and its homeotypes are of great importance for both materials and Earth sciences. The properties of these materials depend strongly on their crystal structures and particularly the intertetrahedral bridging angle and the tetrahedral tilt angle. These angles are highly dependent on composition and the external parameters pressure and temperature. The behavior of the eleven known α-quartz homeotypes, along with examples of α-quartz-type solid solutions, are compared. The distortion in α-quartz-type structures decreases as a function of temperature and increases as a function of pressure. Thermal stability depends on initial structural distortion and on the electronic configuration of the cation. Pressure stability also depends on the former and on cation size. Transitions to new crystalline and/or amorphous forms, often with increased cation coordination number, are commonly observed at high-pressure. The combined use of high-pressure and high-temperature can be used to synthesize novel α-quartz homeotypes in compounds with small cations. © 2004 Oldenbourg Wissenschaftsverlag GmbH Crystallography nationallicence Inorganic chemistry nationallicence Organic chemistry nationallicence Haines Julien aut Cambon Olivier aut Zeitschrift für Kristallographie - Crystalline Materials De Gruyter Oldenbourg 219/6(2004-06-01), 314-323 2194-4946 219:6<314 2004 219 zkri https://doi.org/10.1524/zkri.219.6.314.34639 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1524/zkri.219.6.314.34639 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Haines Julien aut NATIONALLICENCE 700 1- Cambon Olivier aut NATIONALLICENCE 773 0- Zeitschrift für Kristallographie - Crystalline Materials De Gruyter Oldenbourg 219/6(2004-06-01), 314-323 2194-4946 219:6<314 2004 219 zkri CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter