Crystal Structure of LaMnO3+δ Synthesized Using Poly(Acrylic Acid)

✍ Scribed by Hideki Taguchi; Hideaki Yoshioka; Daisuke Matsuda; Mahiko Nagao

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 134 KB
• Volume: 104
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1993.1181

✦ Synopsis

Poly(acrylic acid) (PAA) was used to make a gel from an aqueous solution of fanthanum and manganese ritrates. In the concentration range (3 \times 10^{-2}) to (5 \times 10^{-2} \mathrm{M}) of PAA, the single phase of perovskitetype (\mathrm{LaMnO}{3+8}) was synthesized by firing gels at low temperature. The crystal structure of (\mathrm{LaMnO}{3+8}) changes from hexagonal to orthohombic with increasing concentration of PAA. At (5 \times 10^{-2} \mathrm{M}) of PAA, the crystal structure of (\mathrm{LaMnO}_{3+\delta}) changes from orthorhombic to hexagonal with increasing temperature. 1993 Academic Press, Inc.