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A series of amorphous MoO3-SiO thin films of varying compositions were investigated by infrared spectroscopy. In some cases, a shift in band frequency was observed. Some new peaks appeared when SiO was mixed in MoO3. These new peaks are due to bond-rocking vibrations of the bridging oxygen atoms (430 to 440 cm-1), bending motion of the same oxygen atom (800 to 810 cm-1), stretching vibration of non-bridging oxygen atoms (876 cm-1) and bond-stretching vibrations of oxygen atoms (1040 to 1060 cm-1) in SiO. The band of 940 cm-1 is attributed to the absorption of oxygen atoms in its two-fold-coordinated bridging Si-O-Si bond at an isolated site indicating that there is no oxygen atom as a second-nearest neighbour to any other oxygen atom. 25 2 A 1108 1111 Cited By :3

The spectra of copper-lutetium-phosphate and copper-erbium-phosphate glasses have been studied within the spectral range 4000 to 400 cm- by Fourier transform infrared spectroscopy. Incorporation of a small amount of lutetium or erbium influences some band positions compared with binary copper phosphate glasses. The additional bands in the range 491 to 576 cm-1 are attributed to the presence of Lu-O and Er-O groups. It has been observed that annealing of the samples at 500 ° C leads to a slight shift in the peak positions. © 1990 Chapman and Hall Ltd. 25 9 3956 3959 Cited By :5

The infrared absorption spectra of vacuum-evaporated MoO3-In2O3 thin films are reported for a series of films of varying compositions within the spectral range 4000 to 400 cm-1 and interpreted in relation to the spectrum of the pure MoO3 films. The affects of changes in composition, film thickness, substrate deposition temperature and annealing on the absorption bands are observed. In some cases a shift in band frequency is also observed. The gradual increase in ordering and decrease in valency state with increase of annealing temperature is observed in the infrared curves. Some new peaks appear which reveal the presence of a lower valency state in MoO3. The shift in band frequency may be attributed to the incorporation of Mo(VI) ions in the indium interstitial positions. © 1989 Chapman and Hall Ltd. 24 12 4409 4413 Cited By :4

The spectra of thin amorphous films of MoO3 deposited by vacuum evaporation have been studied within the spectral range 4000-400 cm-1 by the Fourier transform infrared technique. Some samples in the thickness range 100 to 400 nm were investigated at room temperature. Four samples were investigated in the substrate deposition temperature range 293 to 543 K. Some samples were annealed in vacuum in the temperature range 473 to 673 K and their IR spectra were recorded as soon as the samples were cooled to room temperature. It has been observed that annealing of the samples at 473 K or above and also heating the substrates in the temperature range 473 K or above, results in the formation of molybdenum species of lower oxidation state than the normal Mo(VI), i.e. Mo(V). This new oxidation state is formed by electron transfer from the oxygen 2p to the molybdenum 4d level. © 1989 Chapman and Hall Ltd. 24 7 2387 2390 Cited By :21