Structure and ionic conductivity of the lacunary apatite Pb6Ca2Na2(PO4)6

Structure and ionic conductivity of the lacunary apatite Pb6Ca2Na2(PO4)6

Polycrystalline Pb6Ca2Na2(PO4)6 (NCPbAp) was obtained via a solid state reaction. It was characterized by IR spectrometry and X-ray diffraction, its structure was refined using the Rietveld method. It crystallizes in the hexagonal system (s.g. P63/m, a = 9.658(8) A and c = 7.081(6) A) and presents a...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Solid state ionics 2003-02, Vol.158 (1-2), p.157-166
1. Verfasser: Naddari, T
Format: Artikel
Sprache:eng
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:Polycrystalline Pb6Ca2Na2(PO4)6 (NCPbAp) was obtained via a solid state reaction. It was characterized by IR spectrometry and X-ray diffraction, its structure was refined using the Rietveld method. It crystallizes in the hexagonal system (s.g. P63/m, a = 9.658(8) A and c = 7.081(6) A) and presents a lacunary structure stabilized by the electron lone pair of lead (II) ions. At 720 K, an order-disorder phase transition probably of first order is observed either in conductivity or XRD studies versus temperature. Electric conductivity is dominated by the mobility of sodium in the tunnels.
ISSN:0167-2738
DOI:10.1016/S0167-2738(02)00609-4