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

Tian, Hu Yong; Wang, D.Y.; Qi, Jianquan; Wang, Y.; Chan, Helen L. W.; Choy, C. L.

doi:10.1016/j.jallcom.2005.04.140

Cited by 13 publications

(3 citation statements)

References 17 publications

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“…That is why the present work concerns the dielectric study of BaZrO 3 ceramics from both thermal spectra and impedance spectroscopy viewpoints. The distinct grain boundary-modified characteristics of a supposedly highly temperature-and frequency-stable BaZrO 3 dielectric material, as often proposed [3,5,10], together with (i) occurrence of 'non-expected' thermal dielectric loss peaks and (ii) a simple way to predict their temperature locations, will be shown and discussed.…”

Section: Introductionmentioning

confidence: 86%

Grain boundary‐modified dielectric spectra of electroceramics: the occurrence of ‘unexpected' thermal dielectric loss peaks

Antonelli

M’Peko

Hernandes

2007

Physica Status Solidi (b)

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To the memory of Jeanne Tadila and Michel M'Peko. PACS 77.22.Ch, 77.22.Gm, 81.05.Je Manifestation of dielectric/magnetic anomalies is often used to postulate or corroborate occurrence of structural phase transitions in both single-crystal and polycrystalline materials. In the latter case, furthermore, some important aspects of grain-boundary influence on the overall electrical response of materials have been more or less extensively characterized elsewhere. Nevertheless, the possible occurrence of 'anomalous' thermal dielectric loss peaks, not associated with phase transitions or any other potential source, but still arising from grain boundary-induced effects, has been less considered and explored. Here, BaZrO 3 ceramics, commonly proposed to be attractive in the capacitor industry, are found to qualitatively and quantitatively help discussing and approaching this question by measuring, deeply treating and analyzing fixed-frequency and frequency-dependent impedance data. The overall work shows that grain boundary-induced thermal dielectric peaks may occur, with temperature locations that may also be reasonably predicted.

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Section: Introductionmentioning

confidence: 86%

Grain boundary‐modified dielectric spectra of electroceramics: the occurrence of ‘unexpected' thermal dielectric loss peaks

Antonelli

M’Peko

Hernandes

2007

Physica Status Solidi (b)

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“…According to the XRD results (Figures and S6), the phases of pure metal oxides should be stable in the temperature range of 50–900 °C, except for the escape of a few oxygen atoms; − thus, the mass loss in TGA results and the peaks in DTG curves could be induced by the combustion of carbon support in air. In other words, the carbon contents of these materials were almost equal to the total mass loss in TGA curves, which are listed in Table .…”

Section: Resultsmentioning

confidence: 99%

Calcination-Free Synthesis of Porous Metal Oxides/Carbon from Calcium Carbide by Ball Milling

Duan

Wang

Zhang

et al. 2023

Ind. Eng. Chem. Res.

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Calcium carbide is a key intermediate in the chemical industry, such as cyanamide industry (>2 Mton year–1 for CaCN2), and in the manufacture of vinyl chloride (∼13 Mton year–1). The environment-friendly utilization of reactive CaC2 is of great interest. Herein, by ball milling CaC2 and equimolar metal chlorides, porous carbon-supported transition-metal oxides were obtained without calcination treatment. This mechanochemical synthesis route was based on the CaC2 replacement reaction and the Cl–-triggered free-radical reaction. Different metal oxides including Mn3O4/C, Fe3O4/C, NiO x /C, Cu2O/C, ZnO/C, ZrO2/C, Nb2O5/C, CeO2/C, HfO2/C, and WO3/C showed high surface areas up to 232 m2g–1. Moreover, the as-made metal oxides displayed good performance in heterogeneous catalysis. NiO x /C promoted selective nitrobenzene hydrogenation with high conversion and selectivity (>99% Conv., >99% Select.), while CuMnCeO x /C achieved 90% CO conversion at 120 °C in CO oxidation.

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“…Recently, perovskite materials (ABO 3 ) have attracted much attention due to their wide application in the microelectronic and communication fields [1]. Barium titanate (BaTiO 3 , BTO) is one of the pristine ABO 3 compounds that has gained a lot of technology and commercial interest due to its intriguing optical, magnetic, and electrical properties [2]. Zirconium (Zr) doped to the Ti-site of BTO (BaZr x Ti 1-x O 3 , BZT) showed better dielectric properties than pure BTO due to the good chemical stability of Zr 4+ ions as compared to Ti 4+ one.…”

Section: Introductionmentioning

confidence: 99%

Enhanced ferroelectric and ferromagnetic properties of xNiFe₂O₄/(1–x)Ba_0.94Ca_0.06Ti_0.975Zr_0.025O₃ nanocomposites

Linh¹,

Lam²,

Chinh³

et al. 2023

Adv. Nat. Sci: Nanosci. Nanotechnol.

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Bi-phase multiferroic composites of NiFe2O4/Ba0.94Ca0.06Ti0.975Zr0.025O3 (BCTZ/NFO) were successfully fabricated by high-energy ball milling combined with heat treatment. X-ray diffraction patterns and Raman spectra confirmed the successful coexistence of BCTZ and NFO phases in the final composites, which had an average particle size of 50 nm. However, the number of large particles increased with the increased NFO concentration in the composites. Optical properties of the composites were also modified by the NFO content, where the absorption band tended to the visible region and band-gap energies (E g) decreased with the increase of NFO. Ferromagnetic and ferroelectric properties of the BCTZ/NFO composites were also tuned by NFO additive content. Both saturation magnetisation (M s) and remnant magnetisation (M r) increased with the increase of NFO content, where the maximum values of M s = 22.52 emu g−1 and M r = 1.48 emu g−1 for composites with 40% NFO concentration, while coercivity (H c) was maintained at about 60 Oe. Maximum polarisation (P max), remnant polarisation (P r), and coercive field (E c) values all increased with NFO concentration, with 10% NFO providing the highest P max (= 0.249 μC cm−2) and P r (= 0.116 μC cm−2) values, and 30% NFO providing the highest E c (= 1.720 kV cm−1) value with a maximum applied voltage of 1 kV. Therefore, the multiferroic properties of BCTZ/NFO composites could be enhanced with an appropriate concentration of NFO, which led to a wide range of practical applications in the advanced electronic device field.

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

Cited by 13 publications

References 17 publications

Grain boundary‐modified dielectric spectra of electroceramics: the occurrence of ‘unexpected' thermal dielectric loss peaks

Grain boundary‐modified dielectric spectra of electroceramics: the occurrence of ‘unexpected' thermal dielectric loss peaks

Calcination-Free Synthesis of Porous Metal Oxides/Carbon from Calcium Carbide by Ball Milling

Enhanced ferroelectric and ferromagnetic properties of xNiFe₂O₄/(1–x)Ba_0.94Ca_0.06Ti_0.975Zr_0.025O₃ nanocomposites

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

Cited by 13 publications

References 17 publications

Grain boundary‐modified dielectric spectra of electroceramics: the occurrence of ‘unexpected' thermal dielectric loss peaks

Grain boundary‐modified dielectric spectra of electroceramics: the occurrence of ‘unexpected' thermal dielectric loss peaks

Calcination-Free Synthesis of Porous Metal Oxides/Carbon from Calcium Carbide by Ball Milling

Enhanced ferroelectric and ferromagnetic properties of xNiFe2O4/(1–x)Ba0.94Ca0.06Ti0.975Zr0.025O3 nanocomposites

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Enhanced ferroelectric and ferromagnetic properties of xNiFe₂O₄/(1–x)Ba_0.94Ca_0.06Ti_0.975Zr_0.025O₃ nanocomposites