The infra-red spectra of inorganic phosphorus compounds. Part II. Some salts of phosphorus oxy-acids
About: This article is published in Journal of The Chemical Society (resumed).The article was published on 1954-01-01. It has received 122 citations till now. The article focuses on the topics: Phosphorus.
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TL;DR: Fluoride activation has been evaluated by Hallimond tube flotation of collophanite in terms of fluoride concentration, conditioning time, pH, and temperature, and results reveal that efficient oleate flotation can be achieved by fluoride activation as mentioned in this paper.
Abstract: Fluoride activation has been evaluated by Hallimond tube flotation of collophanite in terms of fluoride concentration, conditioning time, pH, and temperature. The results reveal that efficient oleate flotation of collophanite can be achieved by fluoride activation. Experimental results of fluoride adsorption by collophanite suggest that, at low fluoride concentration, a fluoroapatite-type compound may form on the collophanite surface by chemisorption of fluoride ions at calcium sites. At high fluoride concentration, calcium fluoride appears to form at the collophanite surface involving a surface precipitation phenomenon. The formation of CaF2 on the surface of fluoride-treated collophanite is further substantiated by the FTIR spectroscopic measurements, which suggest a meta-thetic exchange with phosphate from the collophanite lattice during the surface precipitation process.
10 citations
TL;DR: In this article, a pure phase of LaP3O9Eu3+ phosphors with orthorhombic structure was successfully synthesized by a polyacrylamide gel process.
Abstract: Pure phase of LaP3O9Eu3+ phosphors with orthorhombic structure was successfully synthesized by a polyacrylamide gel process. The crystal structure, thermal behavior, and optical properties of the as-synthesized samples were investigated by XRD, TG-DTA, FT-IR, and PL. The effects of some synthesis conditions on the structure and properties of samples were also discussed. The results reveal that the annealing temperature and the ratio of (La+Eu) to P in precursor solutions play a key role in determining the structure and luminescence properties of products. The single-phase orthorhombic structure LaP3O9:Eu3+ phosphors can be obtained by annealing at 750–850 °C. The LaP3O9:Eu3+ phosphors emit a dominating and intense line at 618 nm, and exhibit improved photoluminescence properties compared with the samples of LaPO4:Eu3+ crystals. The concentration quenching effect can be observed with increasing Eu3+ concentration over 40 at.%.
10 citations
TL;DR: A new application of rare earth pyrophosphates in vapor phase Beckmann rearrangement of cyclohexanone oxime was investigated in this paper, where rare earth phosphates were characterized by means of XRD, FT-IR, NH3-TPD and water contact angle measurement.
Abstract: A new application of rare earth pyrophosphates in vapor phase Beckmann rearrangement of cyclohexanone oxime was investigated. The rare earth phosphates were characterized by means of XRD, FT-IR, NH3-TPD and water contact angle measurement. It was found that the weak surface acidity and appropriate surface hydrophobicity should be two key factors in the excellent performance of these catalysts.
10 citations
9 citations
TL;DR: An organic-inorganic, hybrid, low-melting glass free of pollution elements such as Pb and F was prepared through nonaqueous acid-base reactions of Si-Cl + P-OH ⇉ Si-O-P + HCl⇈ and Sn-Cl+P-OH as discussed by the authors using phosphonic acid (H3PO3), dimethyldichlorosilane (Me2SiCl2), and tin(II)chloride (SnCl2) as starting materials.
Abstract: An organic–inorganic, hybrid, low-melting glass free of pollution elements such as Pb and F was prepared through nonaqueous acid-base reactions of Si—Cl + P—OH ⇉ Si—O—P + HCl⇈ and Sn—Cl + P—OH ⇉ Sn—O—P + HCl⇈ using phosphonic acid (H3PO3), dimethyldichlorosilane (Me2SiCl2), and tin(II)chloride (SnCl2) as starting materials. Transparent, colorless, and homogeneous phosphite glass was successfully obtained. The formation of P—O—Si linkage and the disappearance of P—OH were confirmed by 31P nuclear magnetic resonance spectra. With increasing Si content, the glass-transition temperature decreased, reflecting the decrease of the average linkage number per one cation.
9 citations