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X-ray Diffraction Data on Two High-Pressure Phases of Calcium Carbonate.
MedLine Citation:
PMID:  17759096     Owner:  NLM     Status:  PubMed-not-MEDLINE    
X-ray diffraction studies conducted at high pressure with a beryllium pressure vessel show that compression parallel to the c-axis of CaCO(3)-I (calcite), as the phase boundary of CaCO-(3)II (modified calcite type) is approached, results in a relative reduction of the c-axis of phase II of several times that of the a-axes. Such data are not consistent with previously proposed anion disorder in CaCO(3)-II. At 18.7 +/- .5 kb and room temperature a new phase of CaCO3 has been observed that is assumed to be phase III found by Bridgman. At this pressure the x-ray diffraction pattern can be indexed as orthorhombic KNO3-IV type, with a0 = 8.90 +/- .01 A, b0 = 8.42 +/- .01 A, and c0 = 7.14 +/- .01 A (Z = 10).
B L Davis
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Science (New York, N.Y.)     Volume:  145     ISSN:  0036-8075     ISO Abbreviation:  Science     Publication Date:  1964 Jul 
Date Detail:
Created Date:  2010-06-07     Completed Date:  2010-07-02     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0404511     Medline TA:  Science     Country:  United States    
Other Details:
Languages:  eng     Pagination:  489-91     Citation Subset:  -    
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