Showing papers on "Vanadate published in 1972"
58 citations
TL;DR: The specific heat of TbVO 4 has been measured in the temperature range 0.5 to 60 K and an anomaly is observed at 33 K which is due to a Jahn-Teller distortion and the overall form of the curve is explained using molecular field theory as discussed by the authors.
23 citations
TL;DR: In this paper, a new thermally stable, and highly strontium-specific inorganic ion exchanger, titanium(IV) vanadate, has been prepared by mixing 0.5 m solution of titanic chloride and sodium vanadates at pH 0.65 m/g at 400 °C.
Abstract: A new, thermally stable, and highly strontium-specific inorganic ion exchanger, titanium(IV) vanadate, has been prepared by mixing 0.5 M solution of titanic chloride and sodium vanadate at pH 0–1. Its ion exchange capacity is 0.65 mequiv./g at 400 °C. Separation factors of Sr2+ with respect to Ba2+, Ca2+, and Mg2+ are 8, 11.8, and 33.3, respectively. Binary mixtures of Sr2+ with Ba2+, Ca2+, and Mg2+ have been separated. Calcium and magnesium are eluted with 0.001 M HNO3. Barium and strontium are eluted with 0.01 and 0.1 M HNO3, respectively. A new parameter ΔC/ΔT is proposed for the study of structural changes in inorganic ion exchangers.
15 citations
TL;DR: In this article, the preparation and properties of dioxodifluoro- and dioxodeichloro-vanadate(V) ions were reported. But the preparation of V was not discussed.
Abstract: The preparation and properties of the dioxodifluoro- and dioxodichloro-vanadate(V) ions are reported.
9 citations
Patent•
14 Jun 1972TL;DR: In this paper, a method for improving the RED LUMINESCENCE and total luminance of rare-earth metals using an ACID solver is described. But the use of ACID is not discussed.
Abstract: A METHOD FOR IMPROVING THE RED LUMINESCENCE AND TOTAL LUMINESCENCE OF RARE-EARTH METAL ACTIVATED YTTRIUM PHOSPHATE VANADATE PHOSPHOR USING ACID MILLING. THE FIRED PHOSPHOR IS MILLING IN AN ACID SOLUTION. THE USE OF ACID DURING THE MILLING PROVIDES AN IMPROVED PHOSPHOR AS COMPARED TO A WATER MILLING FOLLOWED BY THE NORMAL WATER OR BASIC RISIN, AND EVEN PROVIDES AN IMPROVEMENT OVER WATER MILLING FOLLOWING BY AN ACID RESIN. PERFERABLY THE ACID USED IS EITHER CITRIC OR HYDROCHLORIC. THERE IS ALSO PROVIDED THE PHOSPHUR WITH THE IMPROVED SURFACE CHARACTERISTICS WHICH IS THE PRODUCT OF THIS PROCESS.
6 citations
TL;DR: In this paper, it was shown that the degree of oxidation acceleration is inversely correlated with the melting point of the oxide promoter, suggesting a hydrolytic displacement reaction by which the promoter oxide is impregnated on the steel surface.
2 citations
01 Jan 1972
1 citations
01 Jan 1972
1 citations
01 Jan 1972
TL;DR: In this paper, it was shown that vanadium pentoxide in fuel oil ashes reacts with ceramic materials and vanadium vanadate is formed only at temperatures higher than 600°.
Abstract: It has been found that vanadium pentoxide in fuel oil ashes reacts with ceramic materials. Sodium aluminate, s-aluminate, spinel and synthetic spinel have been heated at 650° and 800°C with vanadium pentoxide (melting point 670° to 680°). The corresponding alkali or earth-alkali vanadates had been formed in all the four mixtures at 650° and the X-ray patterns of aluminium vanadate could be determined. As G. Fink (1) has shown, aluminium vanadate is formed only at temperatures higher than 600° and melts incongruently at 690° into corundum and vanadium pentoxide. For this compound the X-ray data of G. Fink did not correspond with those of the ASTM card index, therefore aluminium vanadate has been made according to five different methods, and d-values which correspond with Fink have been found. At 800° aluminium vanadate decomposes completely into corundum and vanadium pentoxide. The above mentioned aluminates were heated with vanadium pentoxide up to 800°, and so were the products which had been formed at 650°. The reaction mixtures showed identical X-ray patterns, apart from the alkali and earth-alkali vanadates only corundum could be found.