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Title: Structure of jadeite melt at high pressures up to 4.9;#8201;GPa

Abstract

The structure of jadeite (NaAlSi{sub 2}O{sub 6}) melts has been studied using multiple-angle energy-dispersive x-ray diffraction up to 4.9 GPa and 1923 K. The first sharp diffraction peak in the structure factor shifts toward higher momentum transfer as pressure increases, indicating the shrinkage of the intermediate network in the melt. The radial distribution function shows a monotonous decrease in average T-T length and T-O-T angle with increasing pressure, but displays no detectable change in the average bond length between tetrahedrally coordinated cations and oxygen (T-O length, where T = Si{sup 4+}, Al{sup 3+}). Our observations indicate that the dominant structural changes occur in the intermediate range order at pressures up to 4.9 GPa. The changes in T-O length, T-T length, and T-O-T angle appear to correlate with the viscosity anomaly in this pressure range.

Authors:
; ; ; ;  [1];  [2]
  1. (CIW)
  2. (
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
NSFOTHER
OSTI Identifier:
1046232
Resource Type:
Journal Article
Journal Name:
J. Appl. Phys.
Additional Journal Information:
Journal Volume: 111; Journal Issue: (11) ; 06, 2012; Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
ENGLISH
Subject:
36 MATERIALS SCIENCE; ALUMINIUM COMPOUNDS; AUGMENTATION; BOND ANGLE; BOND LENGTHS; CATIONS; LENGTH; MOMENTUM TRANSFER; OXYGEN; PRESSURE DEPENDENCE; PRESSURE RANGE GIGA PA; PRESSURE RANGE MEGA PA 10-100; SHRINKAGE; SILICATE MINERALS; SPATIAL DISTRIBUTION; STRUCTURE FACTORS; TEMPERATURE RANGE 1000-4000 K; VISCOSITY; X-RAY DIFFRACTION

Citation Formats

Sakamaki, Tatsuya, Wang, Yanbin, Park, Changyong, Yu, Tony, Shen, Guoyin, and UC). Structure of jadeite melt at high pressures up to 4.9;#8201;GPa. United States: N. p., 2012. Web. doi:10.1063/1.4726246.
Sakamaki, Tatsuya, Wang, Yanbin, Park, Changyong, Yu, Tony, Shen, Guoyin, & UC). Structure of jadeite melt at high pressures up to 4.9;#8201;GPa. United States. doi:10.1063/1.4726246.
Sakamaki, Tatsuya, Wang, Yanbin, Park, Changyong, Yu, Tony, Shen, Guoyin, and UC). Wed . "Structure of jadeite melt at high pressures up to 4.9;#8201;GPa". United States. doi:10.1063/1.4726246.
@article{osti_1046232,
title = {Structure of jadeite melt at high pressures up to 4.9;#8201;GPa},
author = {Sakamaki, Tatsuya and Wang, Yanbin and Park, Changyong and Yu, Tony and Shen, Guoyin and UC)},
abstractNote = {The structure of jadeite (NaAlSi{sub 2}O{sub 6}) melts has been studied using multiple-angle energy-dispersive x-ray diffraction up to 4.9 GPa and 1923 K. The first sharp diffraction peak in the structure factor shifts toward higher momentum transfer as pressure increases, indicating the shrinkage of the intermediate network in the melt. The radial distribution function shows a monotonous decrease in average T-T length and T-O-T angle with increasing pressure, but displays no detectable change in the average bond length between tetrahedrally coordinated cations and oxygen (T-O length, where T = Si{sup 4+}, Al{sup 3+}). Our observations indicate that the dominant structural changes occur in the intermediate range order at pressures up to 4.9 GPa. The changes in T-O length, T-T length, and T-O-T angle appear to correlate with the viscosity anomaly in this pressure range.},
doi = {10.1063/1.4726246},
journal = {J. Appl. Phys.},
issn = {0021-8979},
number = (11) ; 06, 2012,
volume = 111,
place = {United States},
year = {2012},
month = {10}
}