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Crystallization of forsterite xerogel under carbon dioxide: A new crystalline material synthesized by homogeneous distribution of carbonaceous component into forsterite xerogel

Authors
Song, MYKim, SJKwon, HYPark, SHPark, DGKweon, HJKwon, YUBurlitch, JM
Issue Date
May-1999
Publisher
KOREAN CHEMICAL SOC
Citation
BULLETIN OF THE KOREAN CHEMICAL SOCIETY, v.20, no.5, pp.517 - 524
Journal Title
BULLETIN OF THE KOREAN CHEMICAL SOCIETY
Volume
20
Number
5
Start Page
517
End Page
524
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/16841
ISSN
0253-2964
Abstract
By heating the magnesiumsilicate (Mg2SiO4: forsterite) xerogel in carbon dioxide, carbonaceous component was intentionally introduced into the amorphous solid precursor. Carbon was introduced homogeneously as unidentate carbonate. Upon being heated at 800 degrees C in carbon dioxide, the xerogel which had homogeneously distributed carbonaceous component in it crystallized into a single phase product of a new crystalline material, which had approximate composition of Mg8Si4O18C The powder X-ray diffraction pattern of the new crystalline material did not match with any known crystalline compound registered in the powder diffraction file. Crystallization from amorphous xerogel to the new crystalline phase occurred in a very narrow range of temperature, from 750 degrees C to 850 degrees C in carbon dioxide, or in dry oxygen. Upon being heated above 850 degrees C, carbonaceous component was expelled from the product, accompanied by irreversible transition from the new crystalline material to forsterite.
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