THE ANTIMONY-ANTIMONY TRIOXIDE ELECTRODE AND ITS USE AS A MEASURE OF ACIDITY¹

Abstract

The table shows some typical results obtained by this method with samples containing known amounts of iodine. The iodine was added in the form of potassium iodide to samples of mineral mixture containing no iodine or a very slight trace. Blanks were always run on the samples used and on the reagents.Samples which contain no charcoal or bone meal may be fused with 20 g. of sodium hydroxide alone, omitting the potassium nitrate except for the addition of a few small crystals at the end of the fusion. Summary A method is described for the quantitative determination of small amounts of iodine in mixtures of mineral salts, charcoal, spent bone black, etc. The method is a modification of Kendall's and involves fusion with sodium hydroxide and potassium nitrate, removal of interfering substances, oxidation with bromine and determination of the iodine iodimetrically. Necessary conditions are outlined. Other methods were found very unsatisfactory for complex mixtures except when the samples were freshly prepared. Quincy, Illinois

Further investigations on the effects of temperature, frequency and phase constitution on the dielectric properties of antimony trioxide specimens

“…A wet method very similar to that of Roberts and Fenwick [5] was applied for the preparation of pure antimony trioxide. The product was heat-treated at 590 ~ for 15 hr in order to obtain pure orthorhombic antimony trioxide, as proved byX-ray measurements.…”

“…They noted that the breakdown of the film is associated with shock ionization of impurities. As regards the crystal structure, antimony trioxide exists in a cubic and an orthorhombic modification, depending on the method of preparation [5].As far as the author is aware, no work concerning the dependence of the dielectric properties of antimony trioxide on the crystalline modifications is to be found in the literature. Accordingly, it is worth-while to examine this problem.…”

“…The dependence of the dielectric properties of this substance on the mode of preparation and the crystal structure was the major goal of this and previous investigations [3][4][5]. Very few authors have investigated the dielectric constant of Sb20 a.…”

Novel investigations on thermogravimetric and differential thermal analyses of elemental, compound and mixed semiconductors

“…This result indicates that the sample contains traces of the other modification. When l~he sample was heated at 580 ~ for 12 hours [12] and the DTA.run was repeated, the peak disappeared (curve 1). The increase in weight observed in the TG curve due to the formation of Sb204 and Sb205 is not manifested by endo-or exothermic peaks in the DTA curve.…”

Structural transition and amorphization in compressedα−Sb2O3

“…1(a)) 4,7,8,10,35,36 . Orthorhombic β-Sb 2 O 3 (space group Pccn) becomes more stable at ambient pressure and temperatures above 570…”