Structures in the Oxygen-Deficient Fluorite-Related RnO2n−2Homologous Series: Pr12O22

✍ Scribed by J. Zhang; R.B. Von Dreele; L. Eyring

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 317 KB
• Volume: 122
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1996.0081

✦ Synopsis

tion (11)(12)(13)(14). Due to technical difficulties, such as beam tilt and dynamic diffraction, the reliability of these models

The crystal structure of Pr 12 O 22 was determined utilizing Rietveld analysis of powder neutron diffraction data (P2 1 /c, a ‫؍‬ was limited. The low electron scattering cross section for 6.6850(2) A ˚, b ‫؍‬ 11.6004(4) A ˚, c ‫؍‬ 12.8271(4) A ˚, ␤ ‫؍‬ 99.974(1)؇, oxygen and the poor stability of the samples in the electron V ‫؍‬ 979.67(8) A ˚3; total variables 130, R p ‫؍‬ 3.25%, wR p ‫؍‬ beam also presented serious problems for the HRTEM 5.02%). This structure is different from the models previously studies. In addition, the assumption that the oxygen vacanproposed, and the basic structural element is the isolated oxygen cies occurred in pairs in all the intermediate phases convacancy, as observed in another more-oxidized member of the fined the search for models to test. Despite the apparent R n O 2n؊2 series, Tb 11 O 20 .