Synthesis of BaZr0.75Hf0.25O3 by a solid-state reaction technique and characterizations of dielectric properties

High phase purity BaZr0.75Hf0.25O3 (BZH) powders were synthesized from a solid-state reaction using stoichiometric BaCO3 (98%), ZrO2 (98.5%), and HfO2 (98%) powders. The probable reaction pathways were elucidated employing simultaneous thermogravimetry analysis and differential scanning calorimetry...

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Bibliographic Details
Published in:Journal of alloys and compounds 2005-10, Vol.402 (1-2), p.251-255
Main Authors: TIAN, H. Y, WANG, D. Y, QI, J. Q, WANG, Y, CHAN, H. L. W, CHOY, C. L
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Dielectric properties of solids and liquids
Dielectrics, piezoelectrics, and ferroelectrics and their properties
Exact sciences and technology
Permittivity (dielectric function)
Physics
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Summary:High phase purity BaZr0.75Hf0.25O3 (BZH) powders were synthesized from a solid-state reaction using stoichiometric BaCO3 (98%), ZrO2 (98.5%), and HfO2 (98%) powders. The probable reaction pathways were elucidated employing simultaneous thermogravimetry analysis and differential scanning calorimetry (TGA and DSC). The phase variations in compounds heated at different temperatures were also analyzed by X-ray diffraction (XRD). The microstructures and composition of the powders and ceramics were measured and confirmed by TEM and SEM. The dielectric constant was greatly suppressed and low loss was obtained under a dc electric field. At the temperature range of -200 ~ 120DGC, the tunability and the figure of merit (K) are 15.5 ~ 17% and 35 ~ 55, respectively.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2005.04.140