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The Crystal Structure of Bixbyite and the C-Modification of the Sesquioxides

Pauling, Linus and Shappell, M. D. (1930) The Crystal Structure of Bixbyite and the C-Modification of the Sesquioxides. Zeitschrift für Kristallographie - Crystalline Materials, 75 (1). pp. 128-142. ISSN 2194-4946. https://resolver.caltech.edu/CaltechAUTHORS:20180130-103106355

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Abstract

It was discovered in 1925 by Goldschmidt that an extensive series of sesquioxides form cubic crystals with the unit of structure containing 16 M_2O_3, the value of a varying between 9.3 Å and 10.9 Å. An atomic arrangement based on the space group T^5 was assigned this C-modification of the sesquioxides by Zachariasen, who studied crystals of Sc_2O_3, Mn_2O_3, Y_2O_3, In_2O_3, Tl_2O_3, Sm_2O_3, Eu_2O_3, Gd_2O_3, Tb_2O_3, Dy_2O_3, Ho_2O_3, Er_2O_3, Tm_2O_3, Yb_2O_3, Lu_2O_3, and the mineral bixbyite, (Fe, Mn)_2O_3. Zachariasen’s procedure was the following. Using the data from powder and Laue photographs of Tl_2O_3, and neglecting the contribution of the oxygen atoms to the reflections, he decided that the space group is T^5, with the 32 Tl in 8b with parameter t = 0.25, in 12c with parameter u = 0.021, and in 12c with parameter v = 0.542. These parameter values were assumed to hold for all members of the series. The consideration of intensities of reflection of Sc_2O_3 then was found to indicate the 48 O to be in two groups of 24 in the general position of T^5, with parameters x_1 ~ 1/8, y_1 ~ 1/8, x_1 ~ 3/8 and x_2 ~ 1/8, y_2 ~ 3/8, x_2 ~ 3/8. The same structure was also assigned bixbyite, with 16(Mn, Fe)_2O_3 in a unit 9.35 ± 0.02 Å on edge.


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https://doi.org/10.1515/zkri-1930-0109DOIArticle
https://www.degruyter.com/view/j/zkri.1930.75.issue-1/zkri-1930-0109/zkri-1930-0109.xmlPublisherArticle
Additional Information:© Oldenbourg Wissenschaftsverlag GmbH. Received July 5th, 1930.
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Caltech Gates Chemical Laboratory259
Issue or Number:1
Record Number:CaltechAUTHORS:20180130-103106355
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180130-103106355
Official Citation:Pauling, L. & Shappell, M. (1930). The Crystal Structure of Bixbyite and the C-Modification of the Sesquioxides. Zeitschrift für Kristallographie - Crystalline Materials, 75(1), pp. 128-142. doi:10.1515/zkri-1930-0109
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:84575
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:31 Jan 2018 00:14
Last Modified:03 Oct 2019 19:20

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