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Sintering and Dielectric Characterization of Pseudoternary Compounds from the Bi 2 O 3 –TiO 2 –TeO 2 System
Author(s) -
Udovic Marko,
Suvorov Danilo
Publication year - 2007
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.1551-2916.2007.01646.x
Subject(s) - materials science , sintering , ceramic , analytical chemistry (journal) , thermogravimetry , scanning electron microscope , mineralogy , dielectric , microstructure , pellets , characterization (materials science) , metallurgy , composite material , inorganic chemistry , nanotechnology , chemistry , optoelectronics , chromatography
Using X‐ray diffraction analysis, scanning electron microscopy, thermogravimetry, and measurements of the dielectric properties up to the MW frequency range, the characterization of Bi 2 Ti 3 TeO 12 , Bi 2 TiTeO 8 , and Bi 6 Ti 5 TeO 22 compounds, which all include Te 6+ , was performed. As the processes of Te 6+ reduction and the evaporation of TeO 2 ‐containing species contribute to the presence of secondary phases, the preparation of single‐phase ceramics is rather difficult. To minimize the amount of secondary phases during the firing process, the pellets were muffled in a corresponding compound and then fired in an autoclave furnace under 10 bars of oxygen pressure. By sintering the Bi 2 Ti 3 TeO 12 , Bi 2 TiTeO 8 , and Bi 6 Ti 5 TeO 22 between 840° and 1010°C, ceramics with ɛ r ranging from 36 to 350, Q × f values from 220 to 12 500 GHz, and τ f from +41 to +2600 ppm/K were obtained.