ChemInform Abstract: Synthesis of Pyrochlore‐Free 0.9Pb(Mg1/3Nb2/3)O3‐0.1PbTiO3 Ceramics via a Soft Mechanochemical Route.

Baek, Jong Gab; Isobe, Tetsuhiko; Senna, Mamoru

doi:10.1002/chin.199730229

Cited by 3 publications

(3 citation statements)

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“…Mechanical treatment in grinding devices can produce the structural breakdown of aluminosilicate minerals and change them into amorphous substances, but unfortunately, such a mechanic treatment process usually needs dozens or even hundreds of hours and usually gives an incomplete depolymerized product similar to the thermal calcination product. 15,16 In previous work, we proposed a unique high-concentration alkali solution (HCAS) activation method that can activate aluminosilicate minerals such as kaolin and rectorite at a temperature as low as 250 °C. 17−20 The as-synthesized hierarchical ZSM-5 zeolites from activated rectorite showed significantly higher activity than the conventional ones.…”

Section: ■ Introductionmentioning

confidence: 99%

A Quasi-Solid-Phase Approach to Activate Natural Minerals for Zeolite Synthesis

Yang

Liu

Diao

et al. 2017

ACS Sustainable Chem. Eng.

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Synthesis of zeolites or zeolite/clay composites from natural aluminosilicate minerals has received extensive attention because of its great usefulness in greening the zeolite manufacturing process, in which effective activation of natural aluminosilicate minerals is crucially important. Herein, we present an energy saving and green approach, the quasi-solid-phase activation method, to efficiently destruct the natural minerals under the conditions of a temperature as low as 100 °C and an activation time as short as 30 min. Our strategy consists of the following three steps: (1) preparation of a mixture of a natural kaolin mineral, NaOH, and water by kneading, (2) extruding of the mixture into sticks, and (3) low-temperature calcination of the stick, featured by the combined use of mechanochemical actions. The results showed that 84.7% Si species and 69.0% Al species in the kaolin mineral underwent a large degree of depolymerization in the kneading and extruding steps, and following calcination at 100 °C resulted in the complete depolymerization of the kaolin mineral to monomer orthosilicate anions (Q0) and tetracoordinated aluminum (AlIV) species, which are highly active silica and alumina sources for synthesizing aluminosilicate zeolites. Using the activated kaolin mineral as a starting material, pure-phase NaY and NaA zeolites have been successfully synthesized.

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Section: ■ Introductionmentioning

confidence: 99%

A Quasi-Solid-Phase Approach to Activate Natural Minerals for Zeolite Synthesis

Yang

Liu

Diao

et al. 2017

ACS Sustainable Chem. Eng.

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“…Various attempts have been made to fabricate pyrochlore-free ferroelectric relaxors, such as the columbite method, 8 high-energy ball milling, 9 acid modified solid-state reaction, 2 coating 10 and the spark plasma sintering technique. 11 Among these routes, the well-known two-step columbite method is widely used to eliminate pyrochlore phases in lead-based ferroelectric relaxors.…”

Section: Introductionmentioning

confidence: 99%

Pyrochlore‐Free Pb(Ni_1/3Nb_2/3)O₃–PbTiO₃ Ceramics with Superior Piezoelectric Properties Synthesized Using an Optimized Polyethylene Glycol‐Assisted Solid‐State Reaction

Yin

Huang

Zhou

et al. 2010

Journal of the American Ceramic Society

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By introducing polyethylene glycol (PEG) into the raw oxide powders during ball milling, 0.64Pb(Ni1/3Nb2/3)O3–0.36PbTiO3 (0.64PNN–0.36PT) powers, and ceramics with pure perovskite phase have been successfully synthesized. The effect of PEG on the formation of the perovskite phase was examined by varying the amount of PEG200 (40, 60, and 80 wt%) and using PEG with different molecular weight (Mw) during the ball‐milling process. It was determined that interactions between PEG and PbO favor the formation of the desired perovskite phase. The dielectric constant and piezoelectric coefficient in samples prepared with 60 wt% PEG200 were found to be greatly enhanced as compared with that of samples synthesized by the conventional solid‐state reaction method. The room temperature dielectric constant and the maximum dielectric constant (at Tm=90°C) reached 5950 and 33 680, respectively, at a measuring frequency of 1 kHz. The piezoelectric constant d33 reached an exceptionally high value of 570 pC/N. It was determined that PEG with a low Mw was more effective in the formation of the perovskite phase than those with a high Mw.

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“…Many other methods were also found to suppress the formation of the pyrochlore phase, including the sol-gel method, solution processes method, soft mechanochemical pulverization method, molten salt method, and the partial substitution of A-or B-site cations forming solid solutions. [3][4][5][6][7][8][9] The last method appears to be the most promising, and the Pb(Mg 1/3 Nb 2/3 ) O 3 ÀPbTiO 3 (PMN-PT), a pseudobinary solid solution system of PMN and PT, is the widely investigated system for applications in multilayer capacitors, actuators, and transducers. 10 The electrical properties of PMN-PT ceramics are very sensitive to the processing, such as the sintering temperature, grain size, and PbO content.…”

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confidence: 99%

Effect of Annealing Temperature on Dielectric Relaxation and Raman Scattering of 0.65Pb(Mg_1/3Nb_2/3)O₃−0.35PbTiO₃ System

Wang

Zhu

et al. 2010

Journal of the American Ceramic Society

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The influences of annealing temperature on the phase transition, dielectrical, and ferroelectric response of 0.65Pb(Mg1/3Nb2/3)O3−0.35PbTiO3 (PMN−35PT) have been investigated in detail. X‐ray diffraction combined with Raman spectra analysis indicated that the samples annealed below 1100°C show a complete perovskite structure while at higher temperature, the volatilization of PbO results in the formation of the pyrochlore phase. The relative intensity I740/I800 of A1g mode increased with the increase of annealing temperature, indicating the phase transition to the tetragonal side. The annealing can eliminate the grain‐boundary layer, release the internal stress, and improve the homogeneous distribution of polar nanoregions, resulting in the increase of dielectric constants and the decrease of relaxor behavior. Moreover, the squareness Rsq from the P–E hysteresis loop displayed the enhanced trend with the increase of annealing temperature, which can be attributed to the descending of B‐site cation order.

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ChemInform Abstract: Synthesis of Pyrochlore‐Free 0.9Pb(Mg1/3Nb2/3)O3‐0.1PbTiO3 Ceramics via a Soft Mechanochemical Route.

Cited by 3 publications

References 1 publication

A Quasi-Solid-Phase Approach to Activate Natural Minerals for Zeolite Synthesis

A Quasi-Solid-Phase Approach to Activate Natural Minerals for Zeolite Synthesis

Pyrochlore‐Free Pb(Ni_1/3Nb_2/3)O₃–PbTiO₃ Ceramics with Superior Piezoelectric Properties Synthesized Using an Optimized Polyethylene Glycol‐Assisted Solid‐State Reaction

Effect of Annealing Temperature on Dielectric Relaxation and Raman Scattering of 0.65Pb(Mg_1/3Nb_2/3)O₃−0.35PbTiO₃ System

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ChemInform Abstract: Synthesis of Pyrochlore‐Free 0.9Pb(Mg1/3Nb2/3)O3‐0.1PbTiO3 Ceramics via a Soft Mechanochemical Route.

Cited by 3 publications

References 1 publication

A Quasi-Solid-Phase Approach to Activate Natural Minerals for Zeolite Synthesis

A Quasi-Solid-Phase Approach to Activate Natural Minerals for Zeolite Synthesis

Pyrochlore‐Free Pb(Ni1/3Nb2/3)O3–PbTiO3 Ceramics with Superior Piezoelectric Properties Synthesized Using an Optimized Polyethylene Glycol‐Assisted Solid‐State Reaction

Effect of Annealing Temperature on Dielectric Relaxation and Raman Scattering of 0.65Pb(Mg1/3Nb2/3)O3−0.35PbTiO3 System

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Product

Resources

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Pyrochlore‐Free Pb(Ni_1/3Nb_2/3)O₃–PbTiO₃ Ceramics with Superior Piezoelectric Properties Synthesized Using an Optimized Polyethylene Glycol‐Assisted Solid‐State Reaction

Effect of Annealing Temperature on Dielectric Relaxation and Raman Scattering of 0.65Pb(Mg_1/3Nb_2/3)O₃−0.35PbTiO₃ System