Intergrowth Tungsten Bronze Structures of PrxWO3, Formed at 50 kbar: An HRTEM Study

✍ Scribed by N.D. Zakharov; P. Werner; I.P. Zibrov; V.P. Filonenko; M. Sundberg

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 826 KB
• Volume: 147
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1999.8414

✦ Synopsis

New praseodymium intergrowth tungsten bronzes, Pr x WO 3 , of (n)-ITB structure type have been prepared by solid state reaction at P ‫؍‬ 50 kbar and T ‫؍‬ 1570 K. The ordered members n ‫؍‬ 2, 3, and 4 were identi5ed by high-resolution transmission electron microscopy. The structure of (2)-ITB was deduced from an electron micrograph, and the unit cell parameters were determined from the X-ray powder data: a ‫؍‬ 10.17 A s , b ‫؍‬ 7.418 A s , and c ‫؍‬ 3.790 A s . The praseodymium content (0.044x40.1), corresponding to less than half-5lled hexagonal tunnels in the ITB-structures, was found by combining electron di4raction and microanalysis studies of the same crystal fragments. An ordered superstructure, designated (2) 5 (3) 3 -ITB, was also observed.