Structural and thermal studies of H{sub 2}La{sub 2/3}Ta{sub 2}O{sub 7}, a protonated layered perovskite

Journal Article · Thu Apr 13 00:00:00 EDT 2006 · Materials Research Bulletin

DOI:https://doi.org/10.1016/j.materresbull.2005.10.003· OSTI ID:20891666

Le Berre, F ^[1]; Crosnier-Lopez, M P ^[1]; Fourquet, J L ^[1]

---

1. Laboratoire des Oxydes et Fluorures (UMR 6010 CNRS), Institut de Recherche en Ingenierie Moleculaire et Materiaux Fonctionnels (FR 2575 CNRS), Universite du Maine, Avenue O. Messiaen, 72085 Le Mans Cedex 9 (France)

We have synthesised the new protonated layered perovskite H{sub 2}La{sub 2/3}Ta{sub 2}O{sub 7} which is related to the Ruddlesden-Popper family. This compound is obtained by ionic exchange starting from Li{sub 2}La{sub 2/3}Ta{sub 2}O{sub 7} maintained in dilute HNO{sub 3} at 60 deg. C. Thermal X-ray diffraction and DTA/TGA revealed interesting dehydration properties with formation of a layered anhydrous phase leading at higher temperature (1550 deg. C) to La{sub 1/3}TaO{sub 3}. This latter compound exhibits the original lanthanum ordering expected similarly to that of the Li form, while at 900 deg. C a metastable form, presenting a disordered La distribution, is observed.

• OSTI ID: 20891666
• Journal Information: Materials Research Bulletin, Vol. 41, Issue 4; Other Information: DOI: 10.1016/j.materresbull.2005.10.003; PII: S0025-5408(05)00378-8; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
DEFECTS
DEHYDRATION
DIFFERENTIAL THERMAL ANALYSIS
ION EXCHANGE
LANTHANUM
LANTHANUM OXIDES
MICROSTRUCTURE
NITRIC ACID
PEROVSKITE
PHASE TRANSFORMATIONS
TANTALUM OXIDES
THERMAL GRAVIMETRIC ANALYSIS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION