首页|Cuboidal vs equiaxed:The role of nanopowder assembly during BaTiO3 ceramic pressing step

Cuboidal vs equiaxed:The role of nanopowder assembly during BaTiO3 ceramic pressing step

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The functional properties of BaTiO3 ceramics,produced by using the same pressing/sintering strategy from nanopowders with two distinct morphologies(cuboidal/equiaxed nanoparticles)and similar parti-cle sizes,are comparatively investigated.The sintered ceramics exhibit similar nanoscale structures,with faceted crystalline grains and crystalline inclusions,clean grain boundaries and well-defined 90° lamellar domains extending in some entire grains or finer nanodomains inside grain regions.The differences in the functional behavior originating from the different nanopowder morphology are described in terms of the nanoparticle assembly during the pressing step.The numerically simulated green body densification indicated a more efficient assembly resulting in higher density for the cubic particles(0.90 vs.0.84 rel-ative density)and a more homogeneous pore distribution in the spherical-derived ones.As a result of the higher density after sintering,the functional properties are enhanced in cuboid-originated ceramics.For comparison,the ceramic produced from cubic nanoparticles sintered at T1/T2=1250/800 ℃ shows higher permittivity(room temperature value of～2100-cubic vs.～1700-rounded),enhanced ferroelec-tric characteristics(cubic:Ps=8.57 μC cm-2,Pr=0.95 μC cm-2,and Ec=2.3 kV cm-1,with respect to Ps=6.06 μC cm-2,Pr=0.4 μC cm-2,and Ec=1.4 kV cm-1,for spherical-derived ones,measured at Emax=29.3 kV cm-1)and a stronger dc-field dependence of their permittivity of～12％(cubic)vs.only～2％(spherical),for a dc-applied field in the range of-15 kV cm-1＜Edc＜15 kV cm-1.In contrast,the spherical particles-derived ceramics contain fewer defects and have a more homogeneous and finer porosity distribution in the ceramic volume and consequently,they are more stable and sustain larger field applications in comparison with the cubic-derived counterparts.

ElectroceramicsPressingMorphologyCompactionBaTiO3

Vlad Alexandru Lukacs、Radu Stirbu、Oana Andreea Condurache、Lavinia Petronela Curecheriu、Mirela Airimioaei、Cristina Elena Ciomaga、George Stoian、Gabriel Caruntu、Liliana Mitoseriu、Maria Teresa Buscaglia

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Dielectrics,Ferroelectrics & Multiferroics Group,Faculty of Physics,"Al.I.Cuza"University of Iasi,11 Carol I Bv.,700506 Iasi,Romania

Electronic Ceramics Department,Jozef Stefan Institute,Ljubljana 1000,Slovenia

Faculty of Chemistry,"Al.I.Cuza"University of Iasi,11 Carol I Bv.,700506 Iasi,Romania

Department of Exact and Natural Sciences,Institute of Interdisciplinary Research,"Al.I.Cuza"University of Iasi,11 Carol I Bv.,700506 Iasi,Romania

National Institute of Research and Development for Technical Physics,700050 Iasi,Romania

Departement of Chemistry & Biochemistry,Central Michigan University,Mount Pleasant,MI 48859,United States

Institute of Condensed Matter Chemistry and Technologies for Energy,CNR,Via de Marini 6,16149 Genoa,Italy

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Romanian Ministry of Education and Research,CNCS-UEFISCDI

PN-Ⅲ-P1-1.1-PD-2021-0531

2024

10.1016/j.jmst.2023.11.064

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.189(22)