High-energy X-ray diffraction of a hydrous silicate liquid under conditions of high pressure and temperature in a modified hydrothermal diamond anvil cell

被引：6

作者：

Anderson, Alan J. ^{[1
]}

Yan, Hao ^{[2
]}

Mayanovic, Robert A. ^{[2
]}

Solferino, Giulio ^{[1
]}

Benmore, Chris J. ^{[3
]}

机构：

[1] St Francis Xavier Univ, Dept Earth Sci, Antigonish, NS B2G 2W5, Canada

[2] Missouri State Univ, Dept Phys Astron & Mat Sci, Springfield, MO USA

[3] Argonne Natl Lab, Adv Photon Source, Xray Sci Div, Argonne, IL 60439 USA

来源：

HIGH PRESSURE RESEARCH | 2014年 / 34卷 / 01期

基金：

加拿大自然科学与工程研究理事会;

关键词：

hydrothermal diamond anvil cell; high-energy X-ray diffraction; hydrous silicate liquid; high pressure; high temperature; NEUTRON-DIFFRACTION; WATER; SOLUBILITY; FLUIDS; MELTS; KBAR; H2O;

D O I：

10.1080/08957959.2013.870565

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In situ high-energy X-ray diffraction measurements were made for the first time on a water-saturated silicate melt at high pressure and temperature. A modified hydrothermal diamond anvil cell (HDAC), designed to minimize the path length of the X-ray beam within a diamond anvil and to increase the solid angle of the diffracted beam, was used to reduce high background contributions and extend X-ray diffraction data collection in Q space. Quantitative differential pair distribution function (PDF) analysis of X-ray diffraction data show that the first measurable (Si-O) peak is 0.095 angstrom greater in length in the hydrous melt than in the starting glass. Contributions from the H2O O-O correlations, as well as from the second nearest neighbor O-O correlations within the silicate melt, are evident within the second peak of the differential PDF. The procedure described opens new opportunities to directly investigate volatile-rich melts at high pressure and temperature.

引用

页码：100 / 109

页数：10