Table of Contents
Journal of Solid State Physics
Volume 2014 (2014), Article ID 538540, 5 pages
http://dx.doi.org/10.1155/2014/538540
Research Article

Temperature Dependence of the Bragg Peak-Intensity Close to the -Incommensurate- Transition in Quartz

Department of Physics, Middle East Technical University, 06531 Ankara, Turkey

Received 6 August 2014; Accepted 28 September 2014; Published 15 October 2014

Academic Editor: Víctor Lavín

Copyright © 2014 Hamit Yurtseven and Koray Kaymazlar. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Quartz as a mineral has a stable crystalline phase at room temperature and atmospheric pressure; at low temperatures it is in the phase and when it is heated up, it transforms into the phase through the intermediate (incommensurate) phase within the temperature interval of nearly 1.3 K at around 847 K. The order parameter occurs due to a tilting of SiO4 tetrahedra around the threefold axis, which can be related to variation of the peak-intensity with the temperature in quartz. In this study, we analyze the temperature dependence of the Bragg peak-intensity measured through the - transition in quartz, as obtained from the literature according to a power-law formula. From our analysis, we deduce the values of the critical exponent for the order parameter (Bragg peak-intensity) for the -incommensurate (IC-) transition. Our values indicate that the -IC phase transition is of a second order and that the IC- phase transition is of a weak first order, as also reported in the literature.