Dielectric properties of unfilled tetragonal tungsten bronze Ba4PrFe0.5Nb9.5O30 ceramics

The crystallization and dielectric properties of SrO–BaO–Nb2O5–GeO2 glass–ceramics were investigated. One- and two-stage heat-treatment methods were used to convert the parent glass to glass–ceramics. Strontium barium niobate (SBN) with a tetragonal tungsten-bronze structure formed as the major crystalline phase. When the crystallizing temperature/time was increased, the secondary crystalline BaGe2O5 phase coexisted with SBN. BaGe2O5 formed as a surface layer grown from the surface into the interior of the sample. The dendritic morphology of SBN crystals was examined. The glass–ceramics crystallized by two-stage heat treatment have higher dielectric constants than those crystallized by one-stage heat treatment. The highest dielectric constant that was obtained in the present glass–ceramics was 320. The glass–ceramics showed relaxor-type dielectric behavior.

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Grain-size-insensitive dielectric properties of Sr0.6Ba0.4Nb2O6 relaxor ferroelectric ceramics with tetragonal tungsten bronze structure

Ceramics International ◽

10.1016/j.ceramint.2021.11.233 ◽

2021 ◽

Author(s):

Mako Tsuchiya ◽

Shinobu Fujihara ◽

Manabu Hagiwara

Keyword(s):

Grain Size ◽

Dielectric Properties ◽

Tungsten Bronze ◽

Relaxor Ferroelectric ◽

Ferroelectric Ceramics ◽

Tungsten Bronze Structure ◽

Tetragonal Tungsten Bronze ◽

Relaxor Ferroelectric Ceramics

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ChemInform Abstract: Comparative Study of the Influence of the Substitution of an Alkaline Earth metal (Ca, Sr) by a Tetravalent Element (Ce, Th, U) on the Crystallographic and Dielectric Properties of Phases with the "Tetragonal Tungsten Bronze" Structur

Chemischer Informationsdienst ◽

10.1002/chin.198626032 ◽

1986 ◽

Vol 17 (26) ◽

Author(s):

J. THORET

Keyword(s):

Dielectric Properties ◽

Comparative Study ◽

Alkaline Earth ◽

Tungsten Bronze ◽

Earth Metal ◽

Alkaline Earth Metal ◽

Tetragonal Tungsten Bronze

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Influence of Ti additions on the Texture and Dielectric Properties of LSBN-BST Complex Ceramics

MRS Proceedings ◽

10.1557/proc-541-217 ◽

1998 ◽

Vol 541 ◽

Author(s):

J. Portelles ◽

H. Amorín ◽

J. M. Siqueiros ◽

F.F. Castilión ◽

E. Martínez ◽

...

Keyword(s):

Dielectric Properties ◽

Oxygen Vacancies ◽

Tungsten Bronze ◽

Material Structure ◽

X Ray Diffraction ◽

Strontium Barium ◽

Tetragonal Tungsten Bronze ◽

X Ray ◽

First Results

AbstractThe stoichiometric La-Ti doped strontium-barium niobate ceramic system was obtained for different concentrations of Titanium ions (Ti=1,3,5,10,30,50 %), where the Nb5− was substituted by Ti4+ according to the following expression Sr0.255 La0.03Bao0.7Nb2−yTiyO6−y/2 (LSBN-BST). The oxygen vacancies thus created which, together with the vacancies in the A sites of the tetragonal tungsten-bronze (TTB) material structure, have an important influence on their texture and dielectric properties, due to the crucial role of the occupancy of the crystallographic sites. X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy and thermoelectric analyses are reported. We report the first results for thin films of LSBNT- 7 % obtained by the PLD technique. The diffraction pattern reveals the presence of the LSBNT structure without annealing.

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