EMR study and superposition model analysis of Cr³⁺ and Fe³⁺ impurity ions in mullite powders used in aerospace industry

Abstract

Abstract. In this work, the electron magnetic resonance (EMR) spectra of the mullites powders were measured for different grain sizes (0.07 and 0.12 mm). We have used EMR spectroscopy at X-band, combined with superposition model (SPM) calculations to reveal electronic structure and establish correlations between structure, and surroundings of these complexes.

Electron Magnetic Resonance Study of the Most Sensitive Metal Paint Components for Degradation

“…Spin, an intrinsic property of a particle, is the angular momentum of a nucleus or electron. EMR can detect any species with paramagnetic electrons, including organic and inorganic radicals (for example, a superoxide radical in wine [5], or phosphate transport in erythrocytes [6]), transition metal complexes [7], metalloproteins [8], biradicals [9], and more (for example, a mullite and powders used in aerospace industry [10], multi-walled carbon nanotubes and nanohorns [11], and zinc oxide thin films of dilute magnetic semiconductors [12]). EMR were also used by art restorers, historians, and restorers to study paintings.…”