Dielectric properties of nanocrystalline CaCu3Ti4O12 (CCTO) ceramics fabricated from Algerian limestone raw material

被引：6

作者：

Djafar, R. ^{[1
]}

Fasquelle, D. ^{[2
]}

Chaouchi, A. ^{[3
]}

Sedda, K. ^{[1
,4
]}

Bououdina, M. ^{[5
]}

Bellucci, S. ^{[6
]}

Banhegyi, G. ^{[7
]}

机构：

[1] Univ MHamed Bougara, Fac Technol, Res Unit Mat Proc & Environm UR MPE, Boumerdes 35000, Algeria

[2] Univ Littoral Cote dOpale, Unit Dynam & Struct Mol Mat, F-62100 Calais, France

[3] Mouloud Mammeri Univ, Fac Sci, Lab Appl Chem & Chem Engn LCAGC, Tizi Ouzou 15000, Algeria

[4] Res Ctr Ind Technol CRTI, POB 64, Algiers 16014, Algeria

[5] Prince Sultan Univ, Fac Humanities & Sci, Dept Math & Sci, Riyadh, Saudi Arabia

[6] INFN, Lab Nazl Frascati, Via E Fermi 54, I-00044 Frascati, Italy

[7] Medicontur Med Engn Ltd, Herceghalm Ut 1, H-2072 Zsambek, Hungary

来源：

MATERIALS CHEMISTRY AND PHYSICS | 2023年 / 301卷

关键词：

Ceramics; CCTO; Limestone; CaCO; 3; Sintering time; Dielectric properties; MICROSTRUCTURAL EVOLUTION; GIANT; RELAXATION; CONSTANT; BEHAVIOR; SYSTEM; CU2O; SIZE;

D O I：

10.1016/j.matchemphys.2023.127558

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Algerian natural limestone was used to fabricate the perovskite CaCu3Ti4O12 phase (CCTO) to replace com-mercial calcium carbonate (CaCO3) powder by a solid-state method. X-ray diffraction analysis of CCTO ceramics sintered at 1010 degrees C manifested the formation of well-crystallized pure (CCTO) phase with narrow crystallite size (43-99 nm) without any additional phases after sintering beyond 4 h. Thermal analysis by DSC indicated that CCTO phase is stable up to 1151 degrees C, afterwards it decomposes into CaTiO3 and TiO2 and accompanied by the segregation of the CuO/Cu2O phase. Scanning electron microscopy observations of the ceramics sintered at 1010 degrees C showed that most of the grains have an average particle size in the narrow range of 1-2 mu m. The sintered pellet at 1010 C degrees for 14 h showed the optimum density (>94%). This study highlights the importance of using natural calcium carbonates (extracted from Guelma limestone in Algeria) as potential replacement to commercial counterpart for the fabrication of dense well-crystallized perovskite-type ceramics with controlled particle size distribution as promising candidates for electronic applications.

引用

页数：15