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Incorporation of Aliovalent Dopants into the Bismuth‐Layered Perovskite‐Like Structure of BaBi 4 Ti 4 O 15
Author(s) -
Makovec Darko,
Pribošic Irena,
Samardžija Zoran,
Drofenik Miha
Publication year - 2001
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.1151-2916.2001.tb01075.x
Subject(s) - dopant , materials science , solid solution , electron microprobe , bismuth , aurivillius , crystallography , valence (chemistry) , analytical chemistry (journal) , electronegativity , doping , chemistry , dielectric , metallurgy , ferroelectricity , optoelectronics , organic chemistry , chromatography
The solid solubility of the aliovalent dopants Fe 3+ and Nb 5+ in the BaBi 4 Ti 4 O 15 compound, a member of the family of Aurivillius bismuth‐based layer‐structure perovskites, has been studied using quantitative wavelength‐dispersive spectroscopic microanalysis (SEM/EPMA) in combination with X‐ray powder diffractometry (XRPD). The samples with nominal (starting) compositions corresponding to the chemical formulas BaBi 4 Ti 4–4 X Fe 4 X O 15 and BaBi 4 Ti 4–4 X Nb 4 X O 15 were prepared by hot forging a mixture of BaTiO 3 and Bi 4 Ti 3 O 12 with additions of Fe 2 O 3 or Nb 2 O 5 followed by a long annealing at 1100°C. The study showed that an excess charge introduced into the structure by the substitution of Ti 4+ ions with aliovalent dopants was preferentially compensated by a change in the ratio of Ba 2+ to Bi 3+ ions in the host structure according to the general formulas of the solid solutions Ba 1–4 X Bi 4+4 X Ti 4–4 X Fe ′ 4 X O 15 and Ba 1+4 X Bi 4–4 X Ti 4–4 X Nb · 4 X O 15 .