Kaplan, Wayne D. ; Müllejans, H. ; Rühle, M. ; Rödel, Jürgen ; Claussen, Nils (1995)
Ca segregation to basal surface in Alpha-alumina.
In: Journal of the American Ceramical Society. 78 (1995), No. 10, S. 2841-2844, 78 (10)
doi: 10.1111/j.1151-2916.1995.tb08064.x
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
High-resolution transmission electron microscopy (HRTEM) and analytical electron microscopy (AEM) mere used to investigate the structure and chemistry of (0001) alpha-Al2O3/Al interfaces in melt-infiltrated polycrystalline alumina composites, HRTEM revealed an interfacial region different from both Al and alpha-Al2O3, with a structural width of 0.8 +/- 0.2 nm, AEM of the same interfaces revealed a Ca excess of Gamma = 2.5 +/- 0.5 Ca atoms per nm(2) (Ca/nm(2)). AEM of a basal twin boundary in the alpha-Al2O3 also revealed a Ca excess (Gamma = 1.0 +/- 0.5 Ca/nm(2)). Since the metal-ceramic interfaces mere the free surfaces of pores before melt infiltration, it can be concluded that Ca segregates to the basal surface of alumina, as well as to basal twin boundaries. Furthermore, the Ca at the free surfaces does not reside on only one cation plane, but is spread over 4 +/- 1 basal cation layers and forms an interfacial phase with a nominal composition of CaO . 6Al(2)O(3).
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 1995 |
| Autor(en): | Kaplan, Wayne D. ; Müllejans, H. ; Rühle, M. ; Rödel, Jürgen ; Claussen, Nils |
| Art des Eintrags: | Bibliographie |
| Titel: | Ca segregation to basal surface in Alpha-alumina |
| Sprache: | Englisch |
| Publikationsjahr: | 1995 |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of the American Ceramical Society. 78 (1995), No. 10, S. 2841-2844 |
| Jahrgang/Volume einer Zeitschrift: | 78 |
| (Heft-)Nummer: | 10 |
| DOI: | 10.1111/j.1151-2916.1995.tb08064.x |
| Kurzbeschreibung (Abstract): | High-resolution transmission electron microscopy (HRTEM) and analytical electron microscopy (AEM) mere used to investigate the structure and chemistry of (0001) alpha-Al2O3/Al interfaces in melt-infiltrated polycrystalline alumina composites, HRTEM revealed an interfacial region different from both Al and alpha-Al2O3, with a structural width of 0.8 +/- 0.2 nm, AEM of the same interfaces revealed a Ca excess of Gamma = 2.5 +/- 0.5 Ca atoms per nm(2) (Ca/nm(2)). AEM of a basal twin boundary in the alpha-Al2O3 also revealed a Ca excess (Gamma = 1.0 +/- 0.5 Ca/nm(2)). Since the metal-ceramic interfaces mere the free surfaces of pores before melt infiltration, it can be concluded that Ca segregates to the basal surface of alumina, as well as to basal twin boundaries. Furthermore, the Ca at the free surfaces does not reside on only one cation plane, but is spread over 4 +/- 1 basal cation layers and forms an interfacial phase with a nominal composition of CaO . 6Al(2)O(3). |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Nichtmetallisch-Anorganische Werkstoffe 11 Fachbereich Material- und Geowissenschaften > Fachbereich Materialwissenschaft (1999 aufgegangen in 11 Fachbereich Material- und Geowissenschaften) |
| Hinterlegungsdatum: | 19 Nov 2008 15:58 |
| Letzte Änderung: | 20 Feb 2020 13:32 |
| PPN: | |
| Export: | |
| Suche nach Titel in: | TUfind oder in Google |
 |
Frage zum Eintrag |
Optionen (nur für Redakteure)
 |
Redaktionelle Details anzeigen |
Drucken
Impressum