Conduction Electron Spin Resonance of Blue Sodalite

Abstract

shows a single isotropic electron spin resonance line a t g = 2.011. The resonance is attributed t o conduction electron spin resonance of colloidal, small-size, sodium metal clusters. The process of aggregation of sodium and the general behaviour of the isotropic line are discussed with reference to some of the postulated mechanisms.Blaues Sodalit Na,(Al,Si,O,,)Cl, zeigt eine isolierte isotrope Elektronenspinresonanzlinie bei g = 2,011. Die Resonanz wird der Leitungselektronen-Spinresonanz von kleinen kolloidalen Natriummetallclustern zugeordnet. Der AggregationsprozeB von Natrium und das allgemeine Verhalten der isotropen Linie werden beziiglich einiger der postulierten Mechanismen diskutiert.

Temperature Dependence of the EPR Spectra of the Nanocrystalline TiN and TiC Dispersed in a Carbon Matrix

“…The temperature behavior of all these parameters is strongly different for these two samples and this suggested that for this fact physical processes could be responsible that make the mechanical properties of TiC/C more useful for the applica- tions. Titanium carbide and titanium nitride compounds have shown the extreme broadness of the EPR spectra due to the superposition of different paramagnetic centers [4,5]. It is suggested that the observed EPR line could arise from carbon.…”

“…[2,3]. A few works have appeared devoted to the study of electronic properties by using EPR method [4,5]. The extreme broadness of EPR spectra were observed reflecting the high electrical conductivity of the samples.…”

“…The extreme broadness of EPR spectra were observed reflecting the high electrical conductivity of the samples. This electronic behavior is not dissimilar to that of bulk metals, in which the electrons exhibit fairly short spin-lattice relaxation times which give rise to excessively broad lines and render the observation of EPR resonances inaccessible to ordinary spectrometers [4]. Recently, nanocrystalline TiC/C and TiN/C composites were synthesized by the nonhydrolytic sol-gel process that could be an attractive starting point for low-temperature Ti-C coating technologies [6].…”

Magnetic properties of TiCx/C nanocomposites

“…They are characterized by extremely high hardness and high melting temperature that makes them most suitable for applications in metallurgy. Their physical properties have been attracting considerable attention from a fundamental and applied perspective, a major aspect being the difficulty in producing single phase materials corresponding to the nominal chemical formula of titanium carbides [2,4,[5][6][7]. Moreover, disorder phenomena in TiC x , associated with the presence of trivalent titanium ions, have been considered to underlie the hysteresis of the temperature dependence of electrical conductivity [3].…”