, the vibrational modes observed in Raman spectra of molybdates can be classified into two groups, internal and external modes.
The Raman spectrum can be separated into two parts with a wide empty gap in the range 500-700 [cm.sup.-1] that is commonly observed in molybdates containing Mo[O.sub.4] tetrahedra [22, 37-43].
The formation of compound can be attributed to the flame degradation of precursor, ammonium molybdate
tetrahydrate, and entrapment of ammonia and water vapors inside the powders during particle formation.
Sahni, "Crystallization of mixed rare earth (didymium) molybdates
in silica gel," Bulletin of Materials Science, vol.
By comparing the XRD pattern of the standard [gamma]-[Bi.sub.2]Mo[O.sub.6] sample (JCPDS PDF# 72-1524 or 71-2086), it can be realized that all of the Bragg diffraction peaks of each as-fabricated bismuth molybdate
sample in the 20 range of 10-80[degrees] could be well indexed, as indicated in Figure 1 (S1-S4).
In this research, 0.03 mole of sodium molybdate
([Na.sub.2]Mo[O.sub.4]) and 0.06 mole of bismuth nitrate (Bi[(N[O.sub.3]).sub.3]) were dissolved in 600 mL deionized water.
and Non-Molybdate Options for Closed Systems - Part II.
Aqueous molybdenum, cobalt and platinum solutions were prepared from ammonium heptamolybdate (AHM, Merck), sodium molybdate
dihydrate (SoMo, Merck), cobalt (II), nitrate hexahydrate (CoNi, Sigma), cobalt (II) chloride hexahydrate (CoCl, Aldrich), cobalt (II) acetate tetrahydrate (CoAc, Aldrich) and hexachloroplatinic acid (Sigma); deionized water (Milli Q quality, 18.2[mu][OMEGA]) was used in all cases.
(52), (53) In this experiment, it could be clearly appreciated and confirmed that the protective layer is a molybdate
film that dissolved as corrosion continued over time (see Fig.
Szenicsite joins ferrimolybdite, lindgrenite, powellite and wulfenite as a simple molybdate
Our doctoral research at the University has focused on the phosphates, arsenates, vanadates, molybdates
and other secondary minerals in the oxidation zones of Pb-Zn-Fe-Cu orebodies in Extremadura; thus far we have studied and sampled over 40 such deposits, and have identified a sizeable number of mineral species, including many not previously reported from this area.
The third assay involves colorimetric determination of the liberated phosphate  based on the complex reaction between phosphate and molybdate
in an acid environment.