Magnetic Behavior of Pressure Quenched Cadmium Sulfide Containing Chlorine PDF Download
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Author: P. J. Cote
Publisher:
ISBN:
Category :
Languages : en
Pages : 28
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Book Description
Pressure quenched cadmium sulfide (CdS) containing chlorine (Cl) has been shown previously to exhibit both very large diamagnetism and paramagnetism. The diamagnetism observed at 77K approached Meissner proportion and suggested superconducting like behavior in this material. The effect is known to depend sensitively on the Cl content of the starting material. This report describes the results of a survey of the magnetic behavior of pressure quenched samples prepared from CdS systematically doped with increasing amounts of Cl. The Cl doped material was prepared in a variety of ways: from mixtures of CdS and CdCl2, by precipitation from aqueous solution, and by acid doping. The differently doped starting materials were analyzed for Cl and other impurities before being pressure quenched. The magnetic susceptibilities were subsequently measured. The results of the survey indicate that the concentration of Cl required to produce specimens with anomalously large magnetism is 0.75 + or - 0.10 weight percent. The technique for the preparation of such material is described.
Author: P. J. Cote
Publisher:
ISBN:
Category :
Languages : en
Pages : 28
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Book Description
Pressure quenched cadmium sulfide (CdS) containing chlorine (Cl) has been shown previously to exhibit both very large diamagnetism and paramagnetism. The diamagnetism observed at 77K approached Meissner proportion and suggested superconducting like behavior in this material. The effect is known to depend sensitively on the Cl content of the starting material. This report describes the results of a survey of the magnetic behavior of pressure quenched samples prepared from CdS systematically doped with increasing amounts of Cl. The Cl doped material was prepared in a variety of ways: from mixtures of CdS and CdCl2, by precipitation from aqueous solution, and by acid doping. The differently doped starting materials were analyzed for Cl and other impurities before being pressure quenched. The magnetic susceptibilities were subsequently measured. The results of the survey indicate that the concentration of Cl required to produce specimens with anomalously large magnetism is 0.75 + or - 0.10 weight percent. The technique for the preparation of such material is described.
Author: E.Yu Tonkov
Publisher: Taylor & Francis
ISBN: 1351459104
Category : Technology & Engineering
Languages : en
Pages : 588
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Book Description
This is the first book to classify and systematize the available data on the behavior of binary alloys under high pressure. Despite the fact that there is a strong correlation between temperature-composition (T-C) phase diagrams at normal pressure and three- dimensional temperature-composition-pressure (T-C-P) diagrams, many material scientists seldom refer to the (T-C-P) diagrams, just as many high pressure researchers often ignore the data obtained at normal pressure. This book aims to bridge the gap between data obtained at high pressure and that obtained at normal pressure. The most recent research covers not only elements and stoichiometric compounds, but also binary, ternary, and multicomponent alloys, and so this book covers an extended range of substances. The properties of 890 binary systems and a further 1153 pseudobinary and ternary systems are summarized, and accompanied by an extensive bibliography. The data includes information on the solubility of components in solid solutions, melting, and first- and second-order phase transformations in alloys and stoichiometric compounds.
Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 816
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Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 970
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Author: C. G. Homan
Publisher:
ISBN:
Category :
Languages : en
Pages : 18
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Book Description
Magnetic moment measurements of cadmium sulfide (CdS) polycrystalline samples, pressure quenched from above the semi-conducting to conducting transition pressure (40 kbars) at rates approaching 1000000 bars/sec, have been made in a vibrating sample magnetometer to fields approaching 1000 Oersted. The samples exhibit the complex magnetic behavior of low field diamagnetism transforming at fields of several hundred Oersted to positive magnetism.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 996
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Author: R. K. MacCrone
Publisher:
ISBN:
Category :
Languages : en
Pages : 16
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Large positive magnetism (paramagnetism) is reported in poly-crystalline CdS samples pressure quenched from above the semiconducting-conducting phase transition. This positive magnetism reaches a maximum magnetization approaching four gauss at fields between five and twelve KOe. (Author).
Author:
Publisher:
ISBN:
Category : Patents
Languages : en
Pages : 548
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Author: P. J. Cote
Publisher:
ISBN:
Category :
Languages : en
Pages : 20
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Anomalous large diamagnetism and large positive magnetism have recently been reported in pressure quenced CdS polycrystalline samples by Homan and MacCrone. These effects were shown to be sample material source dependent, and as a first step toward characterizing these samples, we compared the thermal and structural properties of various CdS samples before and after pressurization. Samples containing up to 60 wt % C1 were prepared by precipitation from a chloride containing aqueous bath. We find that (i) C1 impurities are probably present in the form of a complex which can decompose on heating to CdS + CdC12, (ii) melting of a portion of the samples containing high levels of C1 occurs at 535 C and is attributed to the eutectic temperature of the CdS + CdC12 mixture, and (iii) heating beyond 535 C produces complete volatization of the CdC12 component. The results on samples prepared by mixing of CdS and CdC12. HxO were examined and found to have similar thermal behavior. The cadmium sulfide used in the previous magnetization study was examined and, based on the similarities in the thermal and structural properties, we conclude that the samples which exhibit the anomalous magnet effects were also prepared by precipitation. In agreement with earlier studies, metastable phases are observed after various pressurizations to above 4.0 GPa.
Author:
Publisher:
ISBN:
Category : Physics
Languages : en
Pages : 816
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