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Occurrence of Dielectric 1:1:4 Compound in the Ternary System BaO—Ln 2 O 3 —TiO 2 (Ln = La, Nd, and Sm): I, An Improved Coprecipitation Method for Preparing a Single‐Phase Powder of Ternary Compound in the BaO—La 2 O 3 —TiO 2 System
Author(s) -
Takahashi Junichi,
Ikegami Takashi,
Kageyama Keisuke
Publication year - 1991
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.1151-2916.1991.tb07801.x
Subject(s) - coprecipitation , ternary operation , ternary compound , stoichiometry , powder diffraction , electron microprobe , phase (matter) , materials science , analytical chemistry (journal) , ternary numeral system , crystallography , chemistry , inorganic chemistry , metallurgy , chromatography , organic chemistry , computer science , programming language
An improved coprecipitation method for incorporating three different cations quantitatively in a precursor was developed to prepare a single‐phase powder of a ternary compound in the system BaO—La 2 O 3 —TiO 2 . The preparation technique consisted of a preliminary introduction of a specified single component as a preformed binary compound powder. This was followed by the quantitative deposition of the remaining unlike cations as coprecipitated particles in a solution containing a suspension of the preformed compound powder. X‐ray fluorescence and electron microprobe analyses showed that the stoichiometric incorporation of the constituent cations was completed for the powder samples thus prepared. From a detailed examination of the phases produced in the composition‐controlled powders, it was evident that a ternary compound having the composition BaO · La 2 O 3 · 4TiO 2 occurs in the present system, for which the X‐ray diffraction data were refined and indexed. In addition, the single‐phase 1:1:4 compound was found to be synthesized from different precursors through different formation processes.