A novel type of incommensurate phase in quartz: The elongated-triangle phase |
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| Authors: | P. Saint-Grégoire E. Snoeck C. Roucau I. Luk’yanchuk V. Janovec |
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| Affiliation: | (1) CEMES-LOE, BP 4347, 31055 Toulouse, Ce’dex, France;(2) L. D. Landau Institute for Theoretical Physics, Moscow, Russia;(3) University of Technology, 16117 Liberec, Czech Republic;(4) Institute of Physics, Academy of Sciences of the Czech Republic, 18040 Prague, Czech Republic |
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| Abstract: | We present evidence for a thermodynamically stable incommensurate elongated-triangle (ELT) phase in quartz, observed by transmission electron microscopy at the α-β structural transition. The phase sequence on cooling is: incommensurate equilateral-triangle (EQT) phase (ferroelectric)—incommensurate ELT (ferroelectric and ferroelastic)— uniform α phase. The ELT blocks could be responsible for the large light scattering in the vicinity of the α-gb transition. Pis’ma Zh. éksp. Teor. Fiz. 64, No. 5, 376–381 (10 September 1996) Published in English in the original Russian journal. Edited by Steve Torstveit. |
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