Local inhomogeneity and surface degradation of Fe1.15Te and Fe1.03Te0.62Se0.38 single crystals

We have investigated the structural and magnetic properties of Fe 1.15 Te and Fe 1.03 Te 0.62 Se 0.38 single crystals grown by slow cooling method using a specially designed double-walled quartz ampoule. X-ray diffraction reveals significant local inhomogeneity as a result of fractional substitution...

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Bibliographic Details
Published in:Journal of materials science 2011-12, Vol.46 (23), p.7582-7587
Main Authors: Rajasekaran, S. V., Tite, T., Chang, Y.-M., Sankar, R., Chou, F. C.
Format: Article
Language:English
Subjects:
Ampoules
Atmospherics
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Cooling
Crystal growth
Crystal structure
Crystallography and Scattering Methods
Hematite
High power lasers
Inhomogeneity
Instability
Irradiation
Magnetic properties
Materials Science
Polymer Sciences
Raman spectroscopy
Single crystals
Solid Mechanics
Structural stability
Substitutes
Superconductivity
Surface stability
Tellurium
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Summary:We have investigated the structural and magnetic properties of Fe 1.15 Te and Fe 1.03 Te 0.62 Se 0.38 single crystals grown by slow cooling method using a specially designed double-walled quartz ampoule. X-ray diffraction reveals significant local inhomogeneity as a result of fractional substitution of Te site by Se in single crystal Fe 1.03 Te 0.62 Se 0.38 . The existence of superconductivity is confirmed for Se substitution to the Te site of Fe 1.03 Te 0.62 Se 0.38 but with persistent Fe 7 Se 8 impurity phase. Raman spectroscopy confirmed the surface structural instability when the samples were exposed to moderate laser irradiation in the atmospheric environment. With high intensity laser irradiation, Fe(Se,Te) compounds can be decomposed into Fe 2 O 3 hematite phase.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-011-5733-z