Charge Compensation of Impurities and Electrical Properties of MoO₃

Abstract

An investigation was made of the EPR spectra of MOO, single crystals grown in air and in argon. I n the crystals grown in air and not specially doped no EPR signal was found. For crystals grown in argon a spectrum is observed due to electrons localized on two different sites of the lattice. This spectrum shows a hfs from a nuclear spin I = l/2. HHH 3d1° ; nocae nporpesa K p a c T a n n a H a ~o a n y x e ~a6~11onae~ccr cnewp Cn2+(3dS). S = 112, I = 312, g, = 2,087, g, = 2,054, g, = 2,416, A, = 6 G, A, = 22,5 G,

Photochromism in transition-metal oxides

“…Virgin and colored MoO 3 films have also been widely characterized by some physical techniques, such as AES [137], AFM [129,148], ESR [6,7,131,[149][150][151][152], FT-IR absorption spectra [132,142,148], SAXS [38], XPS [33,35,36,133,135,148,153], XRD [7,126,137,140,142,148,[154][155][156][157], electrical characterization [6,138,139,149,158], electron diffraction [6,7,137], energy dispersive spectrometer (EDS) [137], neutron diffraction and scattering [155], Raman spectroscopy [53,[159][160][161], scanning electron microscopy (SEM) [38,126,…”

EPR Monitoring of Redox Processes in Transition Metal Oxide Catalysts

“…[156,157] As pointed out earlier, the spectrum of reduced molybdena was very complex, and contained a number of other signals beside the already discussed C and G. Their EPR parameters fell into the range characteristic for reduced molybdenum species retaining the molybdenyl bond. [14,46,47,118,135,140,147,189,190] Analysis of the spectra led to the identification of hexacoordinated and pentacoordinated Mo 5 ions dispersed in the molybdena lattice (signals A and F, respectively), as well as hexacoordinated Mo 5 present in the shear structures formed upon deep reduction (signals E and B). [140,141,147,148] The two former species could be described by the orthorhombic Hamiltonian, Equation (25).…”

Effects of film thickness and substrate temperature on DC conduction in thin amorphous films of MoO3

“…The physical properties of single crystals and amorphous thin films of MOO, have been studied (Deb 1968, Ioffe et al 1969, Tubbs 1974 in order to understand their energy band structure which, for amorphous thin films of MOO,, may be considerably different from that of a single crystal because of their substoichiometric composition and because of their lack of long range order.…”