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Compression of albite, NaAlSi3O8
-
Matthew D. Benusa
and
Nancy L. Ross
Published/Copyright:
March 28, 2015
Abstract
The structure and equation of state of low albite, NaAlSi3O8, has been determined using high-pressure single-crystal X-ray diffraction to a maximum pressure of 9.43 GPa. Low albite remains triclinic in space group C1̄ over the entire pressure range and no phase transitions were observed although the evolution of the unit-cell parameters and volume exhibit some unusual features at pressures above 4 GPa. A third-order Birch-Murnaghan equation of state fit to 6 P-V data points up to 3.4 GPa has K0 = 54.2(7) GPa and K’ = 5.3(6). At higher pressures the volume-pressure curve exhibits d2V/dP2 < 0 and the entire P-V data set can be approximated with a fourth-order Birch-Murnaghan equation of state with K0 = 52.3(9) GPa, K0’ = 8.8(6), and K0’’ = .2.8(2) GPa-1.
The anisotropy of the compression of albite is typical of that of feldspars with 65% of the volume compression accounted for by the compression of the (100) plane normal. This is due to the closing-up of the crankshaft chains of tetrahedra that are characteristic of the feldspar structure. Single-crystal X-ray intensity data sets collected at 6.4, 8.4, and 9.4 GPa also show that the four-membered rings of tetrahedra within the structure undergo significant shear at high pressures. Changes in the rate of shear of the four-membered rings with pressure are associated with changes in the variation of the unit-cell angles with pressure.
Received: 2004-9-3
Accepted: 2004-12-22
Published Online: 2015-3-28
Published in Print: 2005-7-1
© 2015 by Walter de Gruyter Berlin/Boston
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Articles in the same Issue
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- Oxidation/alteration of pentlandite and pyrrhotite surfaces at pH 9.3: Part 1. Assignment of XPS spectra and chemical trends
- Oxidation of pentlandite and pyrrhotite surfaces at pH 9.3: Part 2. Effect of xanthates and dissolved oxygen
- X-ray Rietveld refinement and FTIR spectra of synthetic (Si,Ge)-richterites
- Influence of crystal chemistry on ideal plastic shear anisotropy in forsterite: First principle calculations
- High-temperature Mössbauer study of Fe-substituted mullite
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