Synthesis and characterization of the Aurivillius phases Bi2 − xPbxSr1 − xNdxNb2O9

✍ Scribed by Thomas Rentschler; Mathias Karus; Axel Wellm; Armin Reller

• Book ID: 104296305
• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 558 KB
• Volume: 90
• Category: Article
• ISSN: 0167-2738
• DOI: 10.1016/s0167-2738(96)00388-8

✦ Synopsis

The n = 2 Aurivillius phase Bi,_,Pb,Sr,_,Nd,O, was successfully synthesized as a ceramic material over the whole range of simultaneous, charge compensated substitution x = O-1.0. Structural investigations were performed by Rietveld refinement applying different space groups Fmmm and A2, am, and additionally by X-ray absorption spectroscopy (EXAFS) on the Nd L,,,-edge, confirming the accommodation of Nd on the atomic sites of Sr, which implies the substitution of Bi3' by the isoelectronic Pb*+. The ferroelectric transition temperature T, = 270°C of the substituted powders with x = 0.4 and 1.0 is distinctly reduced compared to the unsubstituted sample with T, = 450°C. In temperature resolved powder X-ray diffraction patterns no structural phase transition could be detected.