Thermal stability of Dion-Jacobson mixed-metal-niobate double-layered perovskites

Journal Article · Wed May 06 04:00:00 EDT 2009 · Materials Research Bulletin

DOI:https://doi.org/10.1016/j.materresbull.2008.10.019· OSTI ID:21199762

Hermann, Andrew T ^[1]

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1. Department of Chemistry and the Advanced Materials Research Institute, University of New Orleans, 2000 Lakeshore Dr., New Orleans, LA 70148 (United States)

The thermal stability and decomposition pathways of six Dion-Jacobson-related double-layered perovskites, ALaNb{sub 2}O{sub 7} (A = H, Li, Na, Ag) and (ACl)LaNb{sub 2}O{sub 7} (A = Fe, Cu), are investigated. These compounds are made by low temperature (<400 deg. C) ion exchange reactions from RbLaNb{sub 2}O{sub 7}. All the compounds are low temperature phases with some of them exhibiting decomposition exotherms consistent with metastability. Decomposition temperatures and reactions pathways vary with the identity of A with most decompositions resulting in the formation of a niobate (containing A) and LaNbO{sub 4}. Results from differential scanning calorimetry and high temperature X-ray powder diffraction studies are presented and structural parameters pertinent to compound stability discussed.

• OSTI ID: 21199762
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 5 Vol. 44; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CALORIMETRY
DECOMPOSITION
ION EXCHANGE
NIOBATES
PEROVSKITES
STABILITY
TEMPERATURE RANGE 0273-0400 K
X-RAY DIFFRACTION