ISSN:
0268-2605
Keywords:
colloidal manganese
;
ESR
;
susceptibility
;
antiferromagnetism
;
superparamagnetism
;
Chemistry
;
Industrial Chemistry and Chemical Engineering
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The reduction of MnBr2·2THF (THF = tetrahydrofuran) using K[BEt3H] yields the organosol [Mn·0.3THF]x. According to the UV/Vis, ESR (electron spin resonance spectroscopy), HRTEM (high-resolution transmission electron microscopy), XPS (X-ray photoelectron spectroscopy) and XAS (X-ray absorption spectroscopy) data, this nanosized metal colloid consists of small THF-stabilized Mn0 particles which show, in susceptibility investigations, a diminished magnetic coupling as deduced from the Weiss temperature, Θ = 96 K. The Neél temperature TN is likewise strongly reduced in comparison with the bulk value (95 K). The THF-stabilized Mn0 particles exhibit superparamagnetism below 20 K, with a partial blocking at 10 K, and to our knowledge represent the first colloid consisting of particles of an elemental antiferromagnetic metal. © 1998 John Wiley & Sons, Ltd.
Additional Material:
6 Ill.
Type of Medium:
Electronic Resource
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