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Preparation and Structural Investigation of Bi 16 (Sr,Ca) 14 O 38
Author(s) -
WongNg Winnie,
Roth Robert S.,
Rawn Claudia J.
Publication year - 1997
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1997.tb02833.x
Subject(s) - bismuth , monoclinic crystal system , crystallography , strontium , alkaline earth metal , ion , crystal structure , zigzag , lone pair , oxide , materials science , space group , ternary operation , chemistry , x ray crystallography , diffraction , alkali metal , molecule , physics , programming language , geometry , mathematics , organic chemistry , computer science , optics , metallurgy
Single‐crystal X‐ray diffraction was used to investigate the structure of the ternary oxide of approximate formula Bi 14 (Sr,Ca) 12 O 33 . The crystal examined was found to have a composition Bi 2 Sr 0.68 Ca 1.07 O 4.75 or Bi 16 Sr 5.44 Ca 8.56 O 38 as a result of refinement. It crystallizes in the monoclinic space group (C2/m), with cell parameters a = 21.764 (4) A, b = 4.3850 (13)° A, c = 12.905 (3) A, β= 102.72 (2)°, and V 1201.2 (5) A 3 . Strontium and calcium ions were found to substitute for each other. The structure consists of a network of alkaline‐earth oxide polyhedra with broad channels parallel to the b axis, in which the bismuth ions reside. Two out of four crystallographically distinct Bi ions form infinite Bi—O zigzag ribbons of edge‐linked Bi—O units, while each of the other two form oxygen corner‐shared Bi—O chains along b . The lone pair electrons of the Bi ions point toward each other in the channels.