Effect of sintering temperature on structural, electrical, and ferroelectric properties of lanthanum and sodium co-substituted barium titanate ceramics

Alkathy, Mahmoud S.1; Hezam, Abdo2; Manoja, K. S. D.1; Wang, Jingwei3,4; Cheng, Chun3,4; Byrappa, K.2; Raju, K. C. James1

2018-09-25

10.1016/j.jallcom.2018.05.138

JOURNAL OF ALLOYS AND COMPOUNDS   影响因子和分区

0925-8388

1873-4669

This article reports the influence of sintering temperature on the structural, dielectric and ferroelectric properties of lead-free Ba0.98La0.01Na0.01TiO3 ceramics synthesized by conventional solid-state reaction technique. The calcination of the ceramic powders has been accomplished using microwave system at 1000 degrees C for 30 min and sintered at four different temperatures, i.e., 1250, 1300, 1350 and 1400 degrees C for 4 h. The XRD analysis along with Rietveld refinement confirms that all samples show a single phase tetragonal structure. The confirmation of tetragonal phase structure has been carried out using Raman study. The elemental composition and chemical states of the sintered pellets have been determined using XPS study. The investigation of Scanning Electron Microscopy (FE-SEM) revealed that the grain size increases with rising sintering temperature. The temperature and frequency dependence of dielectric properties has been investigated using Impedance spectroscopy in the frequency range of 60 Hz -1 MHz and temperature range of RT to 150 degrees C. The Ba0.98La0.01Na0.01TiO3 ceramic sintered at 1350 degrees C obtains the optimum dielectric constant of 2583 and dielectric loss <0.02 due to the superior incorporation of Na+, La3+ and suitable sintering temperature which is highly essential for the fabrication of ceramic capacitors. The studies of the temperature dependent dielectric permittivity indicate phase transition with a clear shift in the Curie temperature towards higher temperature side with sintering temperature. The ferroelectric properties of all sintered samples have been investigated at room temperature. (C) 2018 Elsevier B.V. All rights reserved.

Sintering temperature Co-substitution Raman modes XPS Grain size Dielectric constant Ferroelectric

SCI ; EI

英语

其他

Guangdong-Hong Kong joint innovation project[2016A050503012]

Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering

Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering

WOS:000436600000008

ELSEVIER SCIENCE SA

20182505354344

Barium titanate ; Ceramic materials ; Dielectric losses ; Ferroelectric ceramics ; Ferroelectric materials ; Ferroelectricity ; Grain size and shape ; Lanthanum ; Lanthanum compounds ; Permittivity ; Phase structure ; Powders ; Rietveld refinement ; Scanning electron microscopy ; Sodium compounds ; Solid state reactions ; Structural ceramics ; Structural properties ; X ray photoelectron spectroscopy

Structural Design:408 ; Rare Earth Metals:547.2 ; Electricity: Basic Concepts and Phenomena:701.1 ; Dielectric Materials:708.1 ; Chemistry:801 ; Chemical Reactions:802.2 ; Ceramics:812.1 ; Solid State Physics:933 ; Materials Science:951

MATERIALS SCIENCE

Web of Science

1.Univ Hyderabad, Sch Phys, Hyderabad 500046, Telangana, India
2.Univ Mysore, Vijana Bhavana, Ctr Mat Sci & Technol, Mysuru 570006, India
3.Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China
4.Southern Univ Sci & Technol, Shenzhen Key Lab Nanoimprint Technol, Shenzhen 518055, Peoples R China

Alkathy, Mahmoud S.,Hezam, Abdo,Manoja, K. S. D.,et al. Effect of sintering temperature on structural, electrical, and ferroelectric properties of lanthanum and sodium co-substituted barium titanate ceramics[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2018,762:49-61.

Alkathy, Mahmoud S..,Hezam, Abdo.,Manoja, K. S. D..,Wang, Jingwei.,Cheng, Chun.,...&Raju, K. C. James.(2018).Effect of sintering temperature on structural, electrical, and ferroelectric properties of lanthanum and sodium co-substituted barium titanate ceramics.JOURNAL OF ALLOYS AND COMPOUNDS,762,49-61.

Alkathy, Mahmoud S.,et al."Effect of sintering temperature on structural, electrical, and ferroelectric properties of lanthanum and sodium co-substituted barium titanate ceramics".JOURNAL OF ALLOYS AND COMPOUNDS 762(2018):49-61.