Petalite under pressure: Elastic behavior and phase stability
Abstract
The lithium aluminosilicate mineral petalite (LiAlSi4O10) has been studied using high-pressure single-crystal X-ray diffraction (HP-XRD) up to 5 GPa. Petalite undergoes two pressure-induced first-order phase transitions, never reported in the literature, at ca. 1.5 and 2.5 GPa. The first of these transforms the low-pressure α-phase of petalite (P2/c) to an intermediate β-phase that then fully converts to the high-pressure β-phase at ca. 2.5 GPa. The α→β transition is isomorphic and is associated with a commensurate modulation that triples the unit cell volume. Analysis of the HP-XRD data show that although the fundamental features of the petalite structure are retained through this transition, there are subtle alterations in the internal structure of the silicate double-layers in the β-phase relative to the α-phase. Measurement of the unit cell parameters of petalite as a function of pressure, and fitting of the data with 3rd order Birch-Murnaghan equations of state, has provided revised elastic constants for petalite. The bulk moduli of the α and β-phases are 49(1) and 35(3) GPa, respectively. These values indicate that the compressibility of the- phase of petalite lies between the alkali feldpsars and alkali feldspathoids, whereas the β-phase has a compressibility more comparable with layered silicates. Structure analysis hasmore »
- Authors:
-
- Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States). Dept. of Geosciences
- irginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States). Dept. of Chemistry
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1286796
- Grant/Contract Number:
- AC05-00OR22725; EAR-1118691; CHE-0131128
- Resource Type:
- Accepted Manuscript
- Journal Name:
- American Mineralogist
- Additional Journal Information:
- Journal Volume: 100; Journal Issue: 4; Journal ID: ISSN 0003-004X
- Publisher:
- Mineralogical Society of America
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; phase transition; high pressure; equation of state; petalite; single-crystal x-ray diffraction
Citation Formats
Ross, Nancy L., Zhao, Jing, Slebodnick, Carla, Spencer, Elinor C., and Chakoumakos, Bryan C. Petalite under pressure: Elastic behavior and phase stability. United States: N. p., 2015.
Web. doi:10.2138/am-2015-5105.
Ross, Nancy L., Zhao, Jing, Slebodnick, Carla, Spencer, Elinor C., & Chakoumakos, Bryan C. Petalite under pressure: Elastic behavior and phase stability. United States. https://doi.org/10.2138/am-2015-5105
Ross, Nancy L., Zhao, Jing, Slebodnick, Carla, Spencer, Elinor C., and Chakoumakos, Bryan C. Wed .
"Petalite under pressure: Elastic behavior and phase stability". United States. https://doi.org/10.2138/am-2015-5105. https://www.osti.gov/servlets/purl/1286796.
@article{osti_1286796,
title = {Petalite under pressure: Elastic behavior and phase stability},
author = {Ross, Nancy L. and Zhao, Jing and Slebodnick, Carla and Spencer, Elinor C. and Chakoumakos, Bryan C.},
abstractNote = {The lithium aluminosilicate mineral petalite (LiAlSi4O10) has been studied using high-pressure single-crystal X-ray diffraction (HP-XRD) up to 5 GPa. Petalite undergoes two pressure-induced first-order phase transitions, never reported in the literature, at ca. 1.5 and 2.5 GPa. The first of these transforms the low-pressure α-phase of petalite (P2/c) to an intermediate β-phase that then fully converts to the high-pressure β-phase at ca. 2.5 GPa. The α→β transition is isomorphic and is associated with a commensurate modulation that triples the unit cell volume. Analysis of the HP-XRD data show that although the fundamental features of the petalite structure are retained through this transition, there are subtle alterations in the internal structure of the silicate double-layers in the β-phase relative to the α-phase. Measurement of the unit cell parameters of petalite as a function of pressure, and fitting of the data with 3rd order Birch-Murnaghan equations of state, has provided revised elastic constants for petalite. The bulk moduli of the α and β-phases are 49(1) and 35(3) GPa, respectively. These values indicate that the compressibility of the- phase of petalite lies between the alkali feldpsars and alkali feldspathoids, whereas the β-phase has a compressibility more comparable with layered silicates. Structure analysis has shown that the compression of the -phase is facilitated by the rigid body movement of the Si2O7 units from which the silicate double-layers are constructed.},
doi = {10.2138/am-2015-5105},
journal = {American Mineralogist},
number = 4,
volume = 100,
place = {United States},
year = {Wed Apr 01 00:00:00 EDT 2015},
month = {Wed Apr 01 00:00:00 EDT 2015}
}
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