Raman spectra of Fe2O3 were measured to 62 GPa in a diamond anvil cell. All group theoretically predicted Raman-active phonon modes were detected to 54 GPa. In addition, some high-pressure spectra show an IR-active Eu mode (~660 cm-1), possibly induced by surface defects or stress. ...
In situ high-temperature Raman spectra are presented below and above the glass transition temperature (Tg) of the 0.5Na2O·0.5Fe2O3·3SiO2 (Fe-albite, NFSO), 1.5Na20·0.5Fe2O3·3SiO2 (NFS2), K2O·0.5Fe2O3·3SiO2 (KFS), and reduced K2O·FeO·3SiO2 (KFS-R) compositions. For the...
1 Temperature-DependentPolarizedRamanSpectraofCaFe 2 O 4 N.KolevandM.N.Iliev TexasCenterforSuperconductivityandAdvancedMaterials(TcSAM) UniversityofHouston,Houston,TX77204-5002,USA V.N.Popov FacultyofPhysics,UniversityofSofia,1164Sofia,Bulgaria M.Gospodinov InstituteofSolidStatePhysics,BulgarianAcademyofScie...
A Raman study of the systems Fe 3− x Cr x O 4 and Fe 2− x Cr x O 3 ☆doi:10.1016/0022-4596(89)90245-4Raman spectra off the solid solutions Fe3−xCrxO4 (0 ≤ x ≤ 2) and Fe2−xCrxO3 (0 ≤ x ≤ 2) have been obtained. The fundamental, overtone, and combination...
Raman spectra have been measured in the Na//2F//2-Na//2O-B//2O//3 glasses. Na//2O yields Na//2F//2 substitution brought about no peak shifts but showed a drastic fall in the Tg and Td of the glass. It was assumed that on the substitution of fluorine for oxygen, BO//2F and...
For even higher Fe2O3 contents, Raman spectra indicate a greater degree of depolymerization of the vitreous network than FTIR spectra do. The bands due to the Pb–O bond vibrations are very strongly polarized and the [TeO4] structural units convert into [TeO3] units via an intermediate ...
The evolution of the spectra is dependent on V_2O_5 content. The Raman spectra of x(Fe_2O_3·V_2O _5)·(100-x)[P_2O_5·CaO] system showed that phosphate units are the main structural units of the glass system, iron and vanadium ions are located in the network. The in...
Application of diode-laser Raman spectroscopy for in situ investigation of meat spoilage. (CIGR Symposium Special Issue.) Raman spectroscopy is well suited for non-invasive and non-destructive analysis. The spectra provide detailed information about the composition of the matt... K Sowoidnich,H Sch...
Three stable phases, H-Ph2SiO4, M-Ph2SiO4, and M-Ph2SiO4 (alamosite) and four metastable phases, L-Ph2SiO3, phase X, L-PhSiO3 and hexagonal PhSiO3, occur in the portion of the system investigated. The Raman and ir spectra allow some conclusions to be drawn about the structures...
Raman Studies of ${rm Ti}_{bm{ 1-x}} {rm Fe}_{bm x} {rm O}_{bm 2}$ Nanoparticles ${rm Ti}_{bm{ 1-x}} {rm Fe}_{bm x} {rm O}_{bm 2}$ Nanoparticles]]>Raman spectraX-ray diffractionceramicsferromagnetic materialsmagnetic ... NV Minh,DH Long,NT Khoi,... - 《IEEE Tr...