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Molten-Salt Synthesis of Complex Metal Oxide Nanoparticles

Molten-Salt Synthesis of Complex Metal Oxide Nanoparticles

Published on: October 27, 2018

Pyrosmalite-(Fe), Fe(8)Si(6)O(15)(OH,Cl)(10).

Hexiong Yang, Robert T Downs, Yongbo W Yang

Acta Crystallographica. Section E, Structure Reports Online

|January 20, 2012

Summary

This summary is machine-generated.

This study reveals the crystal structure of pyrosmalite-(Fe), a phyllosilicate mineral, using single-crystal X-ray diffraction. It identifies distinct sites for chloride and hydroxyl groups, differing from previous models.

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Area of Science:

Mineralogy
Crystallography
Geochemistry

Background:

Pyrosmalite-(Fe) is a phyllosilicate mineral within the pyrosmalite series.
Previous studies on related minerals like pyrosmalite-(Mn) proposed a shared site for Cl and OH groups.

Purpose of the Study:

To determine the crystal structure of pyrosmalite-(Fe) using single-crystal X-ray diffraction.
To investigate the site occupancy of Cl and OH groups and the presence of structural water.

Main Methods:

Single-crystal X-ray diffraction analysis of a natural pyrosmalite-(Fe) sample.
Infrared spectroscopy to complement structural findings.

Main Results:

The first structure determination of pyrosmalite-(Fe) reveals a stacking of brucite-type FeO(6) octahedra layers and SiO(4) tetrahedra sheets.
A split-site model was identified, with Cl and OH occupying distinct crystallographic sites, contrasting with prior assumptions.
Evidence suggests the presence of disordered structural water within the pyrosmalite-(Fe) structure.

Conclusions:

The refined structure of pyrosmalite-(Fe) provides new insights into its atomic arrangement and bonding.
The distinct site occupancy of Cl and OH, along with disordered water, refines our understanding of the pyrosmalite series minerals.