Synthesis and Crystal Structure of (Sr1−xLa1+x)Zn1−xO3.5−x/2(0.01≤x<0.03)

✍ Scribed by Hisanori Yamane; Haruya Hara; Shun-ichi Kubota; Masahiko Shimada; Yasuo Yamaguchi

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 469 KB
• Volume: 159
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.2001.9116

✦ Synopsis

Sr 1؊x La 1؉x )Zn 1؊x O 3.5؊x/2 (0.014 4x < 0.03), was prepared at 1373 K in the SrO+La 2 O 3 +ZnO system. The X-ray and neutron powder di4raction peaks were indexed with a body-centered tetragonal unit cell (a ‫؍‬ 3.75 and c ‫؍‬ 13.57 A s for the sample x ‫؍‬ 0.01). Weak di4use superstructure re6ections having periods of & &2؋a and & &2؋c were observed in electron di4raction patterns. The basic statistical structure of the superstructure was re5ned by Rietveld analysis for X-ray and neutron powder diffraction patterns of the sample x ‫؍‬ 0.01 with a model related to an oxygen-de5cient K 2 NiF 4 -type structure, space group I4/mmm, Z ‫؍‬ 2, R wp ‫؍‬ 0.1317, R p ‫؍‬ 0.1052, R I ‫؍‬ 0.0566, and R F ‫؍‬ 0.0371 for X-ray data and R wp ‫؍‬ 0.0796, R p ‫؍‬ 0.0615, R I ‫؍‬ 0.0395, and R F ‫؍‬ 0.0252 for neutron data. In a local structure model, the Zn atom is coordinated by four oxygen atoms. Sr and La atoms are in the eightfold coordination of oxygen atoms.