Heat capacity and other thermodynamic properties of CoTe 2 from 5 to 1 030 K and of CoTe 2.315 from 300 to 1 040 K
dc.contributor.author | Westrum, Edgar F. Jr. | en_US |
dc.contributor.author | Cheda, Jose A. R. | en_US |
dc.contributor.author | Grønvold, Fredrik | en_US |
dc.date.accessioned | 2006-09-08T19:32:06Z | |
dc.date.available | 2006-09-08T19:32:06Z | |
dc.date.issued | 1986-11 | en_US |
dc.identifier.citation | Cheda, Jose A. R.; Westrum, Edgar F.; Grønvold, Fredrik; (1986). "Heat capacity and other thermodynamic properties of CoTe 2 from 5 to 1 030 K and of CoTe 2.315 from 300 to 1 040 K." Monatshefte für Chemie Chemical Monthly 117(11): 1223-1238. <http://hdl.handle.net/2027.42/41694> | en_US |
dc.identifier.issn | 1434-4475 | en_US |
dc.identifier.issn | 0026-9247 | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/41694 | |
dc.description.abstract | The heat capacity of orthorhombic (marcasite-type structure) cobalt ditelluride has been measured from 5 to 1 030 K by adiabatic-shield calorimetry with alternate energy inputs and equilibrations. Above 900 K a marked increase in heat capacity occurs which probably signals a change in the composition of the CoTe 2 -phase towards higher tellurium content. Values at 298.15 and 1 000 K in J K −1 mol −1 of the heat capacity ( C p,m ), entropy [ S m ° (T) − S m ° (0)], and Gibbs energy function − [ G m ° (T) − H m ° (0)] T −1 are 75.23, 114.5, 49.93, and 132.4, 216.2, 139.17, respectively. Consistent with the metallic behavior of CoTe 2 , deviation of the heat capacity from the Debye T 3 -law was found at low temperatures. Comparison with the heat capacity of FeTe 2 shows a Schottky -like deviation with a maximum of 7.3 J K −1 mol −1 at 80 K and evidences the influence of the additional 3 d-electron in cobalt compared to iron. Heat capacity measurements were made on CoTe 2.33 to ascertain the existence range of the CoTe 2+ x -phase and the entropy of the associated structural disorder. Es wurde die Wärmekapazität des orthorhombischen Kobaltditellurids (Markasit-Typ) zwischen 5 und 1 030 K mittels adiabatisch abgeschirmter Kalorimetrie mit alternierender Energiezufuhr und Gleichgewichtseinstellung gemessen. Über 900 K tritt ein deutlicher Anstieg der Wärmekapazität ein, der möglicherweise einen Wechsel in der Zusammensetzung der CoTe 2 -Phase zu einem höheren Tellur-Gehalt anzeigt. Entsprechende Werte bei 298.15 bzw. 1 000 K in J K −1 mol −1 für die Wärmekapazität ( C p, m ), die Entropie [ S m ° (T) − S m ° (0)] und die Gibbs Energiefunktion − [ G m ° (T) − H m ° (0)] T −1 sind 75.23, 114.5, 49.93 bzw. 132.4, 216.2, 139.17. In Übereinstimmung mit dem metallischen Verhalten von CoTe 2 wurde bei niedrigen Temperaturen eine Abweichung der Wärmekapazität vom Debye 'schen T 3 -Gesetz gefunden. Ein Vergleich mit der Wärmekapazität von FeTe 2 zeigt eine Schottky -gemäße Abweichung mit einem Maximum von 7.3 J K −1 mol −1 bei 80 K; dies zeigt den Einfluß der zusätzlichen 3 d-Elektronen im Kobalt, verglichen mit Eisen. Es wurden Wärmekapazitätsmessungen an CoTe 2.33 durchgeführt, um den Existenzbereich der CoTe 2+ x -Phase und die Entropie der damit zusammenhängenden strukturellen Unordnung zu ermitteln. | en_US |
dc.format.extent | 811417 bytes | |
dc.format.extent | 3115 bytes | |
dc.format.mimetype | application/pdf | |
dc.format.mimetype | text/plain | |
dc.language.iso | en_US | |
dc.publisher | Springer-Verlag | en_US |
dc.subject.other | Cobalt Telluride | en_US |
dc.subject.other | Schottky Contributions | en_US |
dc.subject.other | Organic Chemistry | en_US |
dc.subject.other | Physical Chemistry | en_US |
dc.subject.other | Cobalt Ditelluride | en_US |
dc.subject.other | Inorganic Chemistry | en_US |
dc.subject.other | Thermophysics | en_US |
dc.subject.other | Heat Capacity | en_US |
dc.subject.other | Chemistry | en_US |
dc.subject.other | Chemistry/Food Science, General | en_US |
dc.subject.other | Theoretical and Computational Chemistry | en_US |
dc.subject.other | Analytical Chemistry | en_US |
dc.subject.other | 3d Electrons | en_US |
dc.title | Heat capacity and other thermodynamic properties of CoTe 2 from 5 to 1 030 K and of CoTe 2.315 from 300 to 1 040 K | en_US |
dc.type | Article | en_US |
dc.subject.hlbsecondlevel | Materials Science and Engineering | en_US |
dc.subject.hlbsecondlevel | Chemistry | en_US |
dc.subject.hlbsecondlevel | Chemical Engineering | en_US |
dc.subject.hlbtoplevel | Science | en_US |
dc.subject.hlbtoplevel | Engineering | en_US |
dc.description.peerreviewed | Peer Reviewed | en_US |
dc.contributor.affiliationum | Department of Chemistry, University of Michigan, 48109, Ann Arbor, MI, USA; Departamento de Quimica Fisica, Facultad de Quimicas, Universidad Complutense, Madrid 3, Spain | en_US |
dc.contributor.affiliationum | Department of Chemistry, University of Michigan, 48109, Ann Arbor, MI, USA | en_US |
dc.contributor.affiliationother | Department of Chemistry, University of Oslo, Blindern, 0315, Oslo 3, Norway | en_US |
dc.contributor.affiliationumcampus | Ann Arbor | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/41694/1/706_2004_Article_BF00810867.pdf | en_US |
dc.identifier.doi | http://dx.doi.org/10.1007/BF00810867 | en_US |
dc.identifier.source | Monatshefte für Chemie Chemical Monthly | en_US |
dc.owningcollname | Interdisciplinary and Peer-Reviewed |
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