Dielectric properties and structure of Bi4NbO8Cl and Bi4TaO8Clстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The layered intergrowth phases Bi4MO8Cl (M = Nb, Ta), structurally related to the well-known Aurivillius phase ferroelectrics, have been studied using SHG and a.c. impedance techniques. Both undergo a polar to centrosymmetric phase ferroelectric-type transition (T-c = 765 and 640 K for M = Nb and Ta, respectively). The crystal structure of the low temperature phase of Bi4NbO8Cl has been re-analysed, and a tentative structure for Bi4TaO8Cl determined, from powder neutron diffraction data. The basic structural features are confirmed, but significant details differ from the previously reported X-ray structure of Bi4NbO8Cl.