Results 161 to 170 of about 712 (189)

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

Journal of Wuhan University of Technology-Mater. Sci. Ed., 2017
In order to found new dielectrics ceramics in tungsten bronze structure, unfilled tungsten bronze (TB) ceramics with nominal formula Ba4PrFe0.5Nb9.5O30 were prepared by the solid state reaction method. The microstructure and dielectric properties were studied using powder X-ray diffraction, field emission scanning electron microscope, and variable ...
Changzheng Hu, Qihua Zhu, Zhen Sun, Zhe Guo, Laijun Liu, Liang Fang   +5 more
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Microstructural and dielectric properties of ceramics based on tetragonal tungsten bronze

Ferroelectrics, 1999
Abstract Studied ceramics have been sintered from mixtures of powders including a tetragonal tungsten bronze (TTB) phase K0.2Sr0.4NbO3 (KSN), two perovskite phases, Pb(Mg1/3Nb2/3)O3 (PMN) and Pb(Fe½Nb½)O3 (PFN), and a lithium salt in a small amount. We studied the whole relaxor/TTB composition diagram.
Sandrine Vallar, Jaâfar El Fallah, Jean-Marie Haussonne   +2 more
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B-cation effects in relaxor and ferroelectric tetragonal tungsten bronzes

Journal of Materials Chemistry, 2009
The properties of a family of relaxor materials with nominal formula Ba6M3+Nb9O30 (M3+ = Ga3+, Sc3+ and In3+) with the tetragonal tungsten bronze (TTB) structure are reported. The dielectric curves are dramatically shifted (>200 K) to higher temperature with increasing M3+ cation size, in contrast to the opposite effect observed with increasing M4 ...
Donna C. Arnold, Finlay D. Morrison
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Quantum criticality in tetragonal tungsten bronze and pyrochlore structures

2020
Abstract ...
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Mechanism for the ferroelectric transition in the tetragonal-tungsten-bronze structure ferroelectrics

Ferroelectrics, 1978
A microscopic model for the mechanism causing the ferroelectric phase transition in the tetragonal-tungsten-bronze structure ferroelectrics is introduced. It is based on an interaction between the ferroelectric A1 phonon displacement and dynamic local structural instabilities in these materials.
T. L. Reinecke, K. L. Ngai
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Optical spectra of Nd³⁺in niobates of the tetragonal tungsten bronze family

Journal of Physics: Condensed Matter, 2004
Nd:Ba-2.NaNb5O15 (Nd:BNN), Nd:Ba2KNb5O15 (Nd:BKN) and Ba-1.Nd-90(0.26) Li0.42Nb5O15 (BNdLN) single crystals with the tetragonal tungsten-bronze (TTB) structure have been grown by means of the 'flux growth' method. The 10 and 298 K absorption and emission spectra and the room temperature decay curves have been measured and discussed in the light of the ...
Cavalli E, Calestani G, Bovero E, Belletti A, Migliori A   +4 more
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ChemInform Abstract: Crystal Chemistry of the Tetragonal Tungsten Bronze: Ba6FeNb9O30

ChemInform, 1987
Abstract, prepared by solid state reaction of BaCO3, FeC2O4·2 H2O, and Nb2O5 (6:3:4.5, 1350 °C in air, 3 d), crystallizes in a tetragonal bronze‐type structure (P4bm, Z=1).
R. BRANDT, Hk. + MUELLER‐BUSCHBAUM
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Realizing excellent energy storage performances in tetragonal tungsten bronze ceramics via a B-site engineering strategy

Journal of Alloys and Compounds, 2023
Xiangting Zheng, Peng Zheng, Qiaolan Fan   +2 more
exaly  

Structural and Raman properties of the tetragonal tungsten bronze ferroelectric

Solid State Communications, 2010
Y. Amira, Y. Gagou, A. Menny, D. Mezzane, A. Zegzouti, M. Elaatmani, M. El Marssi   +6 more
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Determination of alkali metal in tetragonal and hexagonal tungsten bronzes

Analytica Chimica Acta, 1977
Altaf Hussain, Lars Kihlborg
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