Structural Phase Diagram of Ca1−xYxMnO3: Characterization of Phases

✍ Scribed by D. Vega; G. Polla; A.G. Leyva; P. Konig; H. Lanza; A. Esteban; H. Aliaga; M.T. Causa; M. Tovar; B. Alascio

• Book ID: 102609620
• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 167 KB
• Volume: 156
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.2000.9023

✦ Synopsis

To help the understanding of the physical behavior of Ca 1؊x Y x MnO 3 , its phase diagram in the whole x concentration range was investigated taking into account the stability of phases and the possible coexistence of di4erent structural phases. By careful analysis of powder X-ray di4raction (XRD) patterns, we were able to observe the following phase diagram: (i) Orthorhombic phases were detected both in the region of 04x40.25 (O type phase with Ca site twelve fold coordinated) and in the region of 0.54x(0.75 (O type phase with Ca site ninefold coordinated). (ii) Phase segregation for 0.254x40.5 and for x50.75 that have not been reported previously, hexagonal YMnO 3 segregates as a separate phase for x'0.75, and for 0.254x40.5 the coexistence of Ca 0.75 Y 0.25 MnO 3 (O) and Ca 0.5 Y 0.5 MnO 3 (O) have to be included in the re5nement for it to converge.