40a 20 dhdt vs temperature for different scan rates

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Unformatted text preview: . . . . . . . . . . . . . 50a 21b dH/dT vs Temperature as a Function of X (Group A) . . 50b 22 dH/dT vs Temperature as a Function of X (Group B) . . 52a 23 Specific Heat vs Temperature . . . . . . . . . . . . . . . . . . . . . . . 56a 24 Silver Contribution to Specific Heat vs X . . . . . . . . . . 57a 25 Comparison of C/Nk with Theoretical Calculation B ... 58a P age - 1 C HAPTER 1 I NTRODUCTION Layered compounds have been and are of interest to scientists because of the anisotropy of their physical properties that is observed in configurations alternately parallel and perpendicular to the basal plane. Interest in new and less expensive forms of energy has resulted in economic incentives being made available for energy related research and a significant portion of this research has been directed to the study of layered compounds. For example, research involving the transition metal dichalcogenides has shown that these materials may be excellent candidates as cathodes in high energy density, light weight e lectroi ntercalation batteries ( 1 , 2 , 3 , 4 , 5 , 6 , 7 ) . W hen a cathode (made of one o f t he transition metal dichalcogenides) is i mmersed in a suitable electrolyte with an appropriate counter electrode the ions in solution migrate into the cathode by means of a highly reversible topochemical (chemical bonds are neither formed or broken) reaction producing an EMF as high as a few volts. Other areas of research (8) p oint to the potential use of transition metal dichalcogenides as catalysts in hydrodesulfurization processes (removal of sulfur contaminants from petroleum products). The sulfur which contaminates fossil fuels tends to combine with hydrogen and oxygen in the atmosphere resulting in compounds of major environmental concern. Page - 2 - Ii i nterest to scientists because of the quasi-two-dimensional p roperties for atoms inserted in the region between the layers I 1 o f the host dichalcogenide. A l arge variety of ions and molecules can b e . i n s e r t e d o r intercalated between the layers I I I b ecause of the relatively weak interlayer bonding. The i...
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This note was uploaded on 10/08/2009 for the course CME MAT E 630 taught by Professor Dr. during the Fall '09 term at University of Alberta.

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