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The Crystal Structures and Powder Diffraction Patterns of the Uranium Tellurides: A Critical Review

Published online by Cambridge University Press:  10 January 2013

Robert L. Snyder ,
Monte C. Nichols  and
Dale R. Boehme
Robert L. Snyder
Affiliation:
Institute for Ceramic Superconductivity, New York State College of Ceramics at Alfred University, Alfred, New York 14802, U.S.A.
Monte C. Nichols
Affiliation:
Sandia National Laboratories, Livermore, California 94552, U.S.A.
Dale R. Boehme
Affiliation:
Sandia National Laboratories, Livermore, California 94552, U.S.A.
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Abstract

A critical review of all the reported structures and powder diffraction patterns in the uranium telluride system has been undertaken. Our recommendations are:

1. Structures that are correct:

• Cubic – UTe: no experimental pattern exists. Retain calculated 15–865.

• Cubic – U3Te4: retain poor quality 12-610 but adopt the pattern calculated here.

• Cubic U2Te3: no experimental pattern exists. Adopt pattern calculated here.

• Orthorhombic UTe2: Adopt the new pattern of Boehme et al.

• Monoclinic αUTe3: Adopt the new pattern of Boehme et al.

• Orthorhombic βUTe3: Adopt the pattern calculated here.

• Orthorhombic UTe5: Adopt the new pattern of Boeheme et al.

2. Structures in need of refinement:

• Orthorhombic U2Te3: Adopt pattern calculated here over 34-807.

• Hexagonal U7Te12: Adopt pattern calculated here but retain 24-1368.

• Orthorhombic UTe1.78: Adopt pattern calculated here and retain our modified 21-1404 reported for U4Te7.

• Orthorhombic UTe2.5: Adopt pattern calculated here.

• Orthorhombic UTe3.4: Accept recent pattern of Boehme et al.

3. Phases for which no structures or reliable patterns exist:

• Orthorhombic U3Te4: no published pattern.

• Tetragonal U3Te5: three patterns 21-1407, 34-766 and 34-896 exist but all are of very poor quality.

4. Phases which probably do not exist:

• Tetragonal UTe1.77

• Tetragonal UTe2

• Cubic UTe2

• U3Te7 (21-1402)

• U3Te8 (21-1406)

Type
Research Article
Information
Powder Diffraction , Volume 6 , Issue 4 , December 1991 , pp. 204 - 227
Copyright
Copyright © Cambridge University Press 1991

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