Evolution of Crystallographic Phases in (Sr1−xCax)TiO3 with Composition (x)

✍ Scribed by Rajeev Ranjan; Dhananjai Pandey; W. Schuddinck; O. Richard; P. De Meulenaere; J. Van Landuyt; G. Van Tendeloo

• Book ID: 102604076
• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 482 KB
• Volume: 162
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.2001.9336

✦ Synopsis

Results of X-ray powder di4raction, neutron powder di4raction, electron microdi4raction, and convergent beam electron di4raction (CBED) studies are presented to show that the space group of (Sr 1+x Ca x )TiO 3 (SCT) in the composition range 0.35< x40.55 cannot be Cmcm. The correct space groups are Pbcm for 0.35 < x 40.40 and Pbnm for 0.40 < x 4 0.55. The analysis of powder XRD data reveals that the structure of SCT is noncubic for x 5 0.06. It is shown that four di4erent types of orthorhombic phases appear in the SCT system with increasing Ca 2؉ content.