Preparation, crystal structure and thermal expansion of a novel layered borate, Ba 2Bi 3B 25O 44

S. V. Krivovichev, R. S. Bubnova, S. N. Volkov, M. G. Krzhizhanovskaya, A. V. Egorysheva, S. K. Filatov

Результат исследований: Научные публикации в периодических изданияхстатьярецензирование

14 Цитирования (Scopus)


Single crystals of a new compound, Ba 2Bi 3B 25O 44, were grown by cooling a melt of non-stoichiometric composition. The crystal structure was solved by direct methods and refined to R=0.030 (wR=0.090). The compound is trigonal, R3̄ m, a=7.851(2), c=46.20(1) Å, V=2466.6(6) Å 3, Z=3. The structure is based upon a borate layered anion of the type not previously observed in inorganic compounds. The layer consists of three sublayers; it is ∼13 Å thick and oriented parallel to (001). Two of the sublayers are built from triborate groups, [B 3O 8] 7-, whereas the central sublayer consists of triborate groups, [B 3O 6] 3-. The interlayer space is occupied by the Bi 3 ions in octahedral coordination. The Ba 2 cations are located in the cavities within borate layer. The single-phase polycrystalline sample of Ba 2Bi 3B 25O 44 prepared by solid-state reactions from a stoichiometric mixture has been investigated by high-temperature X-ray powder diffraction in air. Anisotropic character of the thermal expansion is not typical for layered structures: α a=12, α c=6, α V=30×10 -6 ° -1 at 25 °; anisotropy increases on heating: α a=12, α c=0, α V=24×10 -6 ° -1 at 700 °.

Язык оригиналаанглийский
Страницы (с-по)11-16
Число страниц6
ЖурналJournal of Solid State Chemistry
СостояниеОпубликовано - дек 2012

Предметные области Scopus

  • Электроника, оптика и магнитные материалы
  • Керамика и композитные материалы
  • Физика конденсатов
  • Физическая и теоретическая химия
  • Неорганическая химия
  • Химия материалов


Подробные сведения о темах исследования «Preparation, crystal structure and thermal expansion of a novel layered borate, Ba <sub>2</sub>Bi <sub>3</sub>B <sub>25</sub>O <sub>44</sub>». Вместе они формируют уникальный семантический отпечаток (fingerprint).