The effect of heating on the morphology of crystalline neodymium hydroxycarbonate, NdCO3OH

Beatriz Vallina, Juan Diego Rodriguez Blanco, Jesus A. Blanco, Liane G. Benning

5 Citationer (Scopus)

Abstract

The crystallization of hexagonal NdCO3OH through hydrothermal synthesis carried out at slow (reaching the desired temperature within 100 min) and quick (50 min) rates of heating but at variable temperatures (165-220°C) are reported here. The formation of NdCO3OH occurs via the crystallization of an amorphous precursor. Both the precursor and the crystalline NdCO3OH were characterized by X-ray diffraction, infrared spectroscopy and high-resolution electron microscopy. The mechanism of crystallization is very dependent on the experimental conditions (rate of heating and temperature treatment). With increasing temperature, the habit of NdCO3OH crystals changes progressively to more complex spherulitic or dendritic morphologies. The development of these crystal morphologies is suggested here to be controlled by the level at which supersaturation was reached in the aqueous solution during the breakdown of the amorphous precursor. At the highest temperature (220°C) and during rapid heating (50 min) the amorphous precursor breaks down rapidly and the fast supersaturation promotes spherulitic growth. At the lowest temperature (165°C) and slow heating (100 min), however, the supersaturation levels are approached more slowly than required for spherulitic growth, and thus more regular, previously unseen, triangular pyramidal shapes form.

OriginalsprogEngelsk
TidsskriftMineralogical Magazine
Vol/bind78
Udgave nummer6
Sider (fra-til)1391-1397
Antal sider7
ISSN0026-461X
DOI
StatusUdgivet - 1 nov. 2014

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