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HOLZ Rings in EBSD Patterns of the UFeB4 Compound: Association with a Random Distribution of Planar Defects

Published online by Cambridge University Press:  17 September 2013

Marta Dias ,
Patrícia Almeida Carvalho ,
Isabel Cordeiro dos Santos ,
Olivier Tougait ,
Ladislav Havela  and
António Pereira Gonçalves
Marta Dias*
Affiliation:
IST/ITN, Instituto Superior Técnico, University of Lisbon, Estrada Nacional 10, 2686-953 Sacavém, Portugal ICEMS, Instituto Superior Técnico, University of Lisbon, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
Patrícia Almeida Carvalho
Affiliation:
ICEMS, Instituto Superior Técnico, University of Lisbon, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
Isabel Cordeiro dos Santos
Affiliation:
IST/ITN, Instituto Superior Técnico, University of Lisbon, Estrada Nacional 10, 2686-953 Sacavém, Portugal
Olivier Tougait
Affiliation:
Institut des Sciences Chimiques de Rennes, Chemie du Solide et Matériaux, UMR CNRS 6226, Université de Rennes 1, Avenue de Général Leclerc, 35042 Rennes, France
Ladislav Havela
Affiliation:
Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, 121 16 Prague 2, Czech Republic
António Pereira Gonçalves
Affiliation:
IST/ITN, Instituto Superior Técnico, University of Lisbon, Estrada Nacional 10, 2686-953 Sacavém, Portugal
*
*Corresponding author. E-mail: marta.dias@itn.pt
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Abstract

The UFeB4 phase present in different alloys of the B–Fe–U system was studied by powder X-ray diffraction (PXRD) and scanning electron microscopy complemented with energy-dispersive spectroscopy and electron backscattered diffraction (EBSD). The PXRD data showed that the ternary compound crystallized adopting essentially the YCrB4-type structure. However, microstructural observations revealed that under high undercooling conditions the UFeB4 phase exhibits a random distribution of defects parallel to, which are consistently associated with intense higher-order Laue zone rings in EBSD patterns. Indexation of the EBSD patterns showed that the defective structure is compatible with an intergrowth of YCrB4- and ThMoB4-type layers according to the (010)YCrB4//(110)ThMoB4 and [001]YCrB4//[001]ThMoB4 orientation relation previously reported for an analogous compound. Magnetic studies indicated that the annealed UFeB4 compound has a paramagnetic behavior in the 2–300 K temperature range.

Keywords

EBSD patternsHOLZ ringsternary borideplanar defectsrandom intergrowthparamagnetic compound
Type
Portuguese Society for Microscopy
Information
Microscopy and Microanalysis , Volume 19 , Issue 5 , October 2013 , pp. 1204 - 1210
Copyright
Copyright © Microscopy Society of America 2013 

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