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Improved powder diffraction patterns for synthetic paranatisite and natisite

Published online by Cambridge University Press:  05 March 2012

S. Ferdov ,
V. Kostov-Kytin  and
O. Petrov
S. Ferdov
Affiliation:
Central Laboratory of Mineralogy and Crystallography, Bulg. Acad. Sci., bl. 107, Academic G. Bonchev Str., No. 2, 1113 Sofia, Bulgaria
V. Kostov-Kytin
Affiliation:
Central Laboratory of Mineralogy and Crystallography, Bulg. Acad. Sci., bl. 107, Academic G. Bonchev Str., No. 2, 1113 Sofia, Bulgaria
O. Petrov*
Affiliation:
Central Laboratory of Mineralogy and Crystallography, Bulg. Acad. Sci., bl. 107, Academic G. Bonchev Str., No. 2, 1113 Sofia, Bulgaria
*
a)Telephone: (+3592) 9797055; Fax: 1 (+3592) 9797056. Electronic mail: opetrov@dir.bg
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Abstract

Synthetic analogues of the minerals natisite and for the first time of paranatisite were prepared hydrothermally at 200 °C in the system Na2O–TiO2–SiO2–H2O. The obtained powder x-ray diffraction (XRD) patterns were interpreted by the Powder Data Interpretation (PDI) software package. As a result improved indexing and unit cell parameters refinements of these two phases were achieved. Synthetic natisite is tetragonal, space group—P4/nmm, a=0.649 67(8) nm, c=0.508 45(11) nm, V=0.214 50(10) nm3, Z=2, Dcal=3.13 g.cm−1, F30=37.48, M20=52.79. Synthetic paranatisite is orthorhombic, space group—Pmma, a=0.983 86(29) nm, b=0.919 23(19) nm, c=0.481 84(12) nm, V=0.435 78(19) nm3, Z=1, Dcal=3.01 g.cm−1, F30=16.42, M20=29.21.

Keywords

hydrothermal synthesisnatisiteparanatisiteindexing
Type
New Diffraction Data
Information
Powder Diffraction , Volume 17 , Issue 3 , September 2002 , pp. 234 - 237
Copyright
Copyright © Cambridge University Press 2002

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