Preparation and Anisotropic Lattice Thermal Expansion of Hexagonal Cordierite

Abstract:

The hexagonal cordierite was synthesized by the reverse coprecipitation-calcination method and characterized by powder X-ray diffraction. The lattice thermal expansion behavior of hexagonal cordierite was investigated by high temperature X-ray diffraction in the temperature range 298-1273 K. The lattice parameters of the hexagonal cordierite at different temperature were calculated by a least squares method. The hexagonal cordierite expressed anisotropic thermal expansion behavior with the average lattice thermal expansion coefficient were 2.13×10^-6 K^-1 along a or b axis and-1.03×10^-6 K^-1 along c axis from room temperature to 1273 K. The crystal structure of hexagonal cordierite at 298 K and 1273 K were refined by Rietveld method. The thermal expansion coefficient of the height of the [MgO₆]-[AlO₄] polyhedral layer is-1.8×10^-6 K^-1. Although the six-member ring expressed the normal positive thermal expansion along arbitrary direction, the height thermal expansion coefficient of the six-member ring is just 0.6×10^-6 K^-1.

• Periodical: Key Engineering Materials (Volume 726)
• Pages: 470-477
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.726.470
• Online since: January 2017
• Authors: Jin Hua Zhang*, Chang Ming Ke, Hong Dan Wu, Ji Shun Yu
• Keywords: Crystal Structure, Hexagonal Cordierite, High Temperature X-Ray Diffraction, Lattice Thermal Expansion, Reverse Coprecipitation

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