Preparation of Na_1+xFe₄P₁₂ Whiskers by Hydrothermal Reduction Alloying Synthesis Method

Abstract

Skutterudite Na1+ x Fe4P12 whiskers were prepared by a new hydrothermal reduction alloying method. The diameter of the whisker is about 0.5−4 μm and its L/D ratio is about 10−20. Heating temperature and time can control the diameter and length of the skutterudite whisker. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM), electronic diffraction (ED), and X-ray fluorescence analysis have been employed to characterize the products. XRD and ED revealed that the whiskers obtained at 200 °C are cubic skutterudite with a = 7.7995 Å. X-ray fluorescence analysis proved that there are sodium atoms in the skutterudite structure. The possible formation mechanism of Na1+ x Fe4P12 is proposed.

The Metal Flux: A Preparative Tool for the Exploration of Intermetallic Compounds

“…82). One exception is the sodium‐containing filled skutterudite type polyphosphide Na 1+ x Fe 4 P 12 with excess sodium ( x ≈1), which has been prepared hydrothermally 83. Another, very interesting exception is the series of metastable phosphides Ln Fe 4 P 12 , where the Ln components are late‐rare‐earth elements.…”

Metallische Schmelzen – Reaktionsmedien zur Präparation intermetallischer Verbindungen

“…81 Die Herstellung solcher Polyphosphide ohne Zinnflux erfolgte hauptsächlich bei hohen Drücken (Literaturangaben findet man in einem Übersichtsartikel82). Eine Ausnahme bildet das Polyphosphid Na 1+ x Fe 4 P 12 mit überschüssigem Natrium ( x ≈1), das hydrothermal hergestellt wurde 83. Eine weitere bemerkenswerte Ausnahme bildet die Serie der metastabilen Phosphide Ln Fe 4 P 12 ( Ln steht für die schweren Lanthanoide).…”

Synthesis of Bi2Se3 thermoelectric nanosheets and nanotubes through hydrothermal co-reduction method

“…Up to now, there has been little work on the synthesis of thermoelectric material nanostructures by wet-chemical methods. Previously our group synthesized skutterudite nanowires for thermoelectric applications [17,18]. Sander et al [19] have reported an electro-deposition method for the synthesis of Bi 2 Te 3 nanowires by using porous anodic alumina templates.…”