Jan 1, 2023 · This chapter is focused on the Raman studies of spinel AB 2 O 4-type-based structures, especially ferrites. The effect of synthesis techniques, cation distribution, doping, nanostructure formation, etc., on the Raman modes of spinel ferrites has been discussed.

Mar 15, 2022 · Raman spectroscopy, an ideal technique to quantify the Mg–Al cation distribution on the tetrahedral T-sites and octahedral M-sites of MgAl 2 O 4 -spinel, was not calibrated before.

Aug 17, 2015 · For aluminate spinels, the most intense and diagnostic peaks in the spectrum are as follows: F2g (1) at 202 cm −1 for MnAl 2 O 4, Eg at 408 cm −1 for MgAl 2 O 4, F2g (2) at 516 cm −1 for CoAl 2 O 4, F2g (3) at 661 cm −1 for ZnAl 2 O 4, and A1g at 748 cm −1 for FeAl 2 O 4.

Jan 27, 2012 · Solid solution spinel oxides of composition MgxNi1−xCr2O4, NiFexCr2−xO4, and FexCr3−xO4 were synthesized and characterized using x-ray diffraction and Raman spectroscopy. Frequencies of the Raman-active modes are tracked as the metal cations within the spinel lattice are exchanged.

Raman spectra of four aluminate spinels (MgAl 2 O 4 , CoAl 2 O 4 , FeAl 2 O 4 , and MnAl 2 O 4 ) were collected in the spectral range 150 – 900 cm À 1 (Fig. 3).

Welcome to the RRUFF Project website containing an integrated database of Raman spectra, X-ray diffraction and chemistry data for minerals.

Name: Spinel RRUFF ID: R050184 Ideal Chemistry: MgAl 2 O 4 Locality: Pein Pyit, Mogok, Burma Source: Marcus Origlieri Owner: RRUFF Description: Red crystal in calcite, associated with yellowish-green clinohumite, R050183 Status: The identification of this mineral has been confirmed by X-ray diffraction and chemical analysis

Oct 1, 2006 · Ab initio infrared and Raman phonon modes in the normal cubic MgAl2O4 spinel are calculated at the first Brillouin zone centre using density functional theory with plane-wave basis and norm ...

1 day ago · The Raman results of (R–COO) x σ-Co 3 O 4−x after the catalytic reaction show that the intensity of the characteristic peak of the spinel decreases but the crystal structure of the spinel is ...

Jun 26, 2002 · In situ x-ray diffraction and Raman spectroscopy were used to explore the pressure-induced phase transformation of spinel Zn 2 TiO 4 to pressures of 52.4 and 81.1 GPa, respectively. Results indicate that spinel Zn 2 TiO 4 initially transforms to the orthorhombic (CaTi 2 O 4) structure at 23.7 GPa, and such a phase transition is complete at 32.4 ...