Two New Sr-Rich Layered Manganites with a 1:1 Bi–Sr Ordering: 1201 Bi0.4Sr2.6MnO5−δ and 2201 Bi0.9Sr3.1MnO6−δ

✍ Scribed by D. Pelloquin; A. Maignan; M. Hervieu; C. Michel; B. Raveau

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 727 KB
• Volume: 151
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.2000.8641

✦ Synopsis

Two new strontium-rich manganites with a layered structure, Bi 0.4 Sr 2.6 MnO 5؊ and Bi 0.9 Sr 3.1 MnO 6؊ , have been synthesized and characterized, using X-ray powder di4raction and electron microscopy. The 5rst, Bi 0.4 Sr 2.6 MnO 5؊ , crystallizes in the space group I4/mmm with a ‫؍‬ 5.3756(1) A s and c ‫؍‬ 35.578(1) A s and shows for the 5rst time the possibility to stabilize a manganite with a 1201-type structure. The second, Bi 0.9 Sr 3.1 MnO 6؊ , which crystallizes in the P2 1 space group with a ‫؍‬ 5.2829(2) A s , b ‫؍‬ 5.2998(2) A s , c ‫؍‬ 23.9906(6) A s , and ‫؍‬ 90.27(2)3, exhibits a 2201 unmodulated structure. Both oxides are characterized by a 1 : 1 ordering between bismuth and strontium forming rows parallel to bo , while a quadrupling of the c parameter is observed in the case of the 1201 structure. The investigation of their magnetic properties shows a complex magnetic behavior connected to the existence of trivalent manganese in MnO 2 planes.