A furnace which permits simultaneous heating of sample and reference compartments, and which can be readily installed or removed from the unmodified instrument, is described for the Unicam SP 700 spectrophotometer. A technique for preparing air sensitive melts is included. The spectrum of Nd+3 in the LiCl-KCl eutectic is shown to illustrate the performance of the instrument.
Repeated dynamic electrical test of current generation anisotropic magnetoresistive (AMR) heads indicated that ESD exposure was likely during test, characterized as a decline in amplitude over time. Giant magnetoresistive (GMR) heads failed catastrophically upon mounting to the Guzik spin stand. By evaluating AMR performance under repeated controlled test sequences, as well as direct current transient measurement techniques, we determined that the particular configuration of software and hardware which was being used during this test generated current transients across the recording head of up to 40 mA peak currents, which was believed to cause both the AMR degradation and the GMR failures. By modifying the hardware and software, the problem was successfully resolved. Qualification of electrical test equipment using current transient measurements was found to be invaluable in fully understanding and correcting current transient problems in test processes.
The methods of potentiometry and polarography have been used to study the Ti(II) and Ti(III) ions in solution in the LiCl–KCl eutectic at 450 °C and 550 °C. Solutions of Ti(II) were prepared by anodic dissolution of Ti metal, and Ti(III) solutions by coulometric titration of Ti(II) by Pt(II). Apparent standard electrode potentials were measured for the Ti(II)/Ti and Ti(III)/Ti(II) couples against the Pt(II)/Pt and Ag(I)/Ag reference electrodes. Values obtained on the mole fraction scale with a Pt(II)/Pt reference electrode were[Formula: see text]Polarographic waves for oxidation and reduction of Ti(II), and for reduction of Ti(III), were observed.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe unified laboratory program for chemistry majorsD. A. Aikens , R. A. Bailey , G. G. Giachino , J. A. Moore , and R. P. T. Tomkins Cite this: J. Chem. Educ. 1975, 52, 4, 232Publication Date (Print):April 1, 1975Publication History Received3 August 2009Published online1 April 1975Published inissue 1 April 1975https://doi.org/10.1021/ed052p232RIGHTS & PERMISSIONSArticle Views76Altmetric-Citations1LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (3 MB) Get e-Alerts Get e-Alerts
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