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 114 citation(s) till now. The article focuses on the topic(s): Phosphorus.
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TL;DR: In this paper, the relative intensity of the IR bands responsible for the different phosphate units was analyzed to determine the relative spectrum intensity of different units, and it was shown that the substitution of P2O5 by Na2O influences the intermediate range order of the glass matrix.
Abstract: Infrared absorption spectra of sodium phosphate glasses, Na2O=30–50 mol%, have been studied in the region of 400–2000 cm−1. Spectra were analyzed to determine the relative intensity of the IR bands responsible for the different phosphate units. Spectral analyses has shown that the substitution of P2O5 by Na2O influences the intermediate range order of the glass matrix. Increasing Na2O content leads to a gradual degradation of the phosphate ring type structures, with consequent depolymerization causing compaction of the glass matrix. Analyses of IR spectra illustrates the reorganization effects of Na2O in the phosphate matrix.
365 citations
TL;DR: It is demonstrated that the loss of “H2O” below 200°C is reversible and causes no significant change in the lattice parameter of these apatites, whereas loss of H2O between 200° and 400°C are irreversible and causes a contraction in the α-axis dimension.
Abstract: Types of “H2O” in human enamel and in precipitated apatites are characterized using X-ray diffraction, infrared (IR) absorption spectroscopic and thermogravimetric analyses. Changes in lattice parameters (principally in the α-axis dimensions) and in the character of the IR absorption bands are correlated with weight losses at pyrolysis temperatures of 100° to 400°C and with effect of rehydration and reignition of previously ignited samples.
226 citations
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...This latter band is attributed to the P-O-P vibration of the P2074- group (24, 25)....
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TL;DR: In this article, a multilayer thin film consisting of anionic α-zirconium phosphate (α-ZrP) sheets and polycations (poly(allylamine hydrochloride) (PAH), cytochrome c) were characterized by transmission electron microscopy (TEM), ellipsometry, UV−visible absorbance spectroscopy, reflectance FT-IR, XPS, and X-ray diffraction.
Abstract: Monolayer and multilayer thin films consisting of anionic α-zirconium phosphate (α-ZrP) sheets and polycations (poly(allylamine hydrochloride) (PAH), cytochrome c) were characterized by transmission electron microscopy (TEM), ellipsometry, UV−visible absorbance spectroscopy, reflectance FT-IR, XPS, and X-ray diffraction. Titration and powder X-ray diffraction experiments confirm that exfoliation of α-ZrP begins to occur when enough tetra(n-butylammonium) hydroxide (TBA+OH-) has been added to exceed single-layer packing of TBA+ ions (x ≈ 0.50) in the intercalation compound Zr(HPO4)2-x(TBA+PO4-)x·nH2O. The identical contrast of many sheets in TEM micrographs suggests that the suspension is unilamellar. Alternately dipping cationic substrates into α-ZrP-containing suspensions and aqueous PAH gives a multilayer film that resembles the corresponding bulk intercalation compound. X-ray photoelectron spectra of multilayer films show that they are Zr-rich, relative to α-ZrP, consistent with some corrosion during t...
223 citations
TL;DR: Calcium phosphate coatings produced using the ion beam sputter deposition process are amorphous and a series of different post-deposition heat treatments were conducted to produce crystalline HA-type coatings, suggesting the formation of a new phase.
Abstract: Calcium phosphate coatings produced using the ion beam sputter deposition process are amorphous. To produce crystalline coatings, a series of different post-deposition heat treatments were conducted. Heat treatments conducted at temperatures less than 500 C did not produce crystalline phases in the coatings. A 500°C post-deposition heat treatment provided the energy required to produce a hydroxyapatite (HA)-type coating as determined using X-ray diffraction and Fourier transform IR spectroscopy (FTIR). Although post-deposition heat treatments can reduce the adhesion of a coating to its substrate, the 500°C heat treatment did not decrease the coating bond strength. Heat treatments conducted at 600°C were found to produce crystalline HA-type coatings but these heat treatments significantly reduced the coating bond strength. Cracks were observed on the surface of the 600 C heat treated coatings. FTIR analysis revealed a new absorption band at 820cm −1 for the 600 C heat treated coatings, suggesting the formation of a new phase.
127 citations
TL;DR: In this paper, the infrared and visible spectra of glasses in the Ag2OP2O5 glass-forming system were obtained and the partial covalent nature of the Ag-O-P bond was discussed.
Abstract: The infrared and visible spectra of glasses in the Ag2OP2O5 glass-forming system were obtained. The infrared data were interpreted as indicating the presence of polymeric chains in these glasses. The partial covalent nature of the AgOP bond was discussed. A mixed NaPO3AgPO3 glass showed no unexpected bands in the infrared spectrum, again showing that silver is behaving in a manner similar to alkali metal ions in phosphate glasses. The shift in the absorption edge in the visible spectra of glasses of different Ag/P ratio was shown to arise from either an increase in the concentration of nonbridging oxygens with increasing silver content, or the presence of colloidal silver metal particles.
124 citations