Lilova, K. I. ; Hord, R. ; Alff, L. ; Albert, Barbara ; Navrotsky, A. (2013)
Thermodynamic study of orthorhombic Tx and tetragonal T′ lanthanum cuprate, La2CuO4.
In: Journal of Solid State Chemistry, 204
doi: 10.1016/j.jssc.2013.05.005
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
The enthalpies of transition among the Tx, T′, and T–La2CuO4 phases are obtained from a combination of differential scanning calorimetry, high temperature oxide melt solution calorimetry, and transposed temperature drop calorimetry. The enthalpy of transformation of Tx to T is 2.32±0.07 kJ/mol and the corresponding entropy of transition is 4.38±0.13 J/(mol K). The T′ modification, with an average of 1.40 kJ/mol, is less stable in enthalpy than Tx but at 0.96 kJ/mol, more stable in enthalpy than T. Although we cannot rule out a small stability field at temperatures near the Tx–T transition at 530 K, T′ is most likely metastable at all temperatures.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2013 |
| Autor(en): | Lilova, K. I. ; Hord, R. ; Alff, L. ; Albert, Barbara ; Navrotsky, A. |
| Art des Eintrags: | Bibliographie |
| Titel: | Thermodynamic study of orthorhombic Tx and tetragonal T′ lanthanum cuprate, La2CuO4 |
| Sprache: | Englisch |
| Publikationsjahr: | August 2013 |
| Verlag: | Elsevier Science Publishing |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of Solid State Chemistry |
| Jahrgang/Volume einer Zeitschrift: | 204 |
| DOI: | 10.1016/j.jssc.2013.05.005 |
| Kurzbeschreibung (Abstract): | The enthalpies of transition among the Tx, T′, and T–La2CuO4 phases are obtained from a combination of differential scanning calorimetry, high temperature oxide melt solution calorimetry, and transposed temperature drop calorimetry. The enthalpy of transformation of Tx to T is 2.32±0.07 kJ/mol and the corresponding entropy of transition is 4.38±0.13 J/(mol K). The T′ modification, with an average of 1.40 kJ/mol, is less stable in enthalpy than Tx but at 0.96 kJ/mol, more stable in enthalpy than T. Although we cannot rule out a small stability field at temperatures near the Tx–T transition at 530 K, T′ is most likely metastable at all temperatures. |
| Freie Schlagworte: | Lanthanum cuprate (La2CuO4), Transition enthalpies, High-temperature superconductor, Thermodynamics, High-temperature calorimetry |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Dünne Schichten 07 Fachbereich Chemie 07 Fachbereich Chemie > Eduard Zintl-Institut > Fachgebiet Anorganische Chemie |
| Hinterlegungsdatum: | 09 Jan 2014 08:55 |
| Letzte Änderung: | 04 Mär 2020 12:15 |
| PPN: | |
| Sponsoren: | The calorimetric work was supported by the U.S. Department of Energy, grant DE-FG02-03ER46053. L.A., R.H., and B.A. acknowledge the financial support of the Deutsche Forschungsgemeinschaft. |
| Export: | |
| Suche nach Titel in: | TUfind oder in Google |
 |
Frage zum Eintrag |
Optionen (nur für Redakteure)
 |
Redaktionelle Details anzeigen |
Drucken
Impressum