Universität zu Köln

Kalita, Patricia E., Cornelius, Andrew, Lipinska, Kristina, Sinogeikin, Stanislav, Fischer, Reinhard X., Luehrs, Hanna and Schneider, Hartmut (2014). High Pressure Behavior of 7: 4 Mullite and Boron-Substituted Mullite: Compressibility and Mechanisms of Amorphization. J. Am. Ceram. Soc., 97 (9). S. 2980 - 2990. HOBOKEN: WILEY. ISSN 1551-2916

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Abstract

The high-pressure elastic properties behavior, phase stability, and mechanisms of amorphization of the alumino-silicate 7:4 mullite and a corresponding mullite doped with boron were investigated in situ by powder synchrotron X-ray diffraction with a diamond anvil cell in quasi-hydrostatic conditions. The samples of 7Al(2)O(3):4SiO(2) (Al4.66Si1.33O9.67), referred to as 7:4 mullite and an alumino-silicate mullite with 3.5(4) mol% B2O3, referred to as B-mullite, were compressed, in small pressure steps, up to 27.8 and 28.9GPa, respectively, and then decompressed back to ambient pressure. All along the compression path both samples' patterns are indexable with a mullite structure. Compression data are smooth up to a threshold pressure, from which point the diffraction peaks appeared to broaden, and the refined unit cell parameters deviate significantly down from the compressional trend. Above similar to 23GPa the diffraction patterns are not indexable anymore, suggesting amorphization. Rietveld structural refinements allow for a description of the pressure-induced main deformation mechanisms and structural trends. Pressure-induced mechanisms of amorphization are also discussed. A third-order Birch Murnaghan equation of state is fitted to the pressure-volume data to obtain experimental bulk moduli, as well as axial compressibilities for 7:4 mullite and B-mullite. Finally the volume compression in response to the applied pressure, combined with thermal expansion coefficients, allows a P-T-V equation-of-state for B-mullite to be proposed.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Kalita, Patricia E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cornelius, Andrew UNSPECIFIED UNSPECIFIED UNSPECIFIED Lipinska, Kristina UNSPECIFIED UNSPECIFIED UNSPECIFIED Sinogeikin, Stanislav UNSPECIFIED UNSPECIFIED UNSPECIFIED Fischer, Reinhard X. UNSPECIFIED UNSPECIFIED UNSPECIFIED Luehrs, Hanna UNSPECIFIED UNSPECIFIED UNSPECIFIED Schneider, Hartmut UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-430197
DOI:	10.1111/jace.13027
Journal or Publication Title:	J. Am. Ceram. Soc.
Volume:	97
Number:	9
Page Range:	S. 2980 - 2990
Date:	2014
Publisher:	WILEY
Place of Publication:	HOBOKEN
ISSN:	1551-2916
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language CRYSTAL-STRUCTURE; STABILITY; PHASE; TRANSFORMATIONS; DIFFRACTION; SILICATE; AL2SIO5; STATE Multiple languages Materials Science, Ceramics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/43019