Transmission electron microscopy study of polymorphism in barium gallate BaGa2O4

H. Lemmens, S. Amelinckx, G. Van Tendeloo, A. M. Abakumov, M. G. Rozova, E. V. Antipov

Результат исследований: Вклад в журналСтатьярецензирование

12 Цитирования (Scopus)

Аннотация

Polymorphism in barium gallate BaGa2O4 was studied using electron diffraction and high resolution electron microscopy. Three modifications of BaGa2O4 with structures closely related to the high-temperature α-form were observed. The phase transitions from γ-BaGa2O4 (aγ = 18.6143(2)Å = 2√3aα, cγ = 8.6544(1) Å = cα, S.G. P63) to β-BaGa2O4 (aβ = 2aα, Cβ = cα S.G. P6 3) and to the new δ-polymorph having a monoclinic structure (aδ = cα, bδ = 2a α + bα, cδ = 2b α and β ≈ 92°, S.G. P21/c) were induced by electron beam irradiation. High resolution electron microscopy (HREM) observations allow to establish the close similarity between the structures of δ-BaGa2O4 and β-SrGa2O4. The γ→β and β-δ transitions involve a rearrangement of oxygen atoms in the BaO layers together with a tilting distortion of the tetrahedral framework. The microstructure of the δ-phase is characterised by the presence of numerous translation and orientation domains.

Язык оригиналаАнглийский
Страницы (с-по)653-670
Число страниц18
ЖурналPhase Transitions
Том76
Номер выпуска7
DOI
СостояниеОпубликовано - 2003
Опубликовано для внешнего пользованияДа

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