Role of Co dopants on the structural, optical and magnetic properties of lead-free ferroelectric Na0.5Bi0.5TiO3 materials

Dũng, Đặng Đức; Doan, N. B.; Dũng, Nguyễn Quốc; Bac, Luong Huu; Linh, Nguyen Hoang; Thanh, Le Thi Hai; Thiet, Duong Van; Trung, Nguyễn Ngọc; Khang, Nguyen Cao; Trung, Trinh Van; Duc, Nguyen Van

doi:10.1016/j.jsamd.2019.08.007

Cited by 10 publications

(10 citation statements)

References 23 publications

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“…The M r and H C values of BaFeO 3−δ -modified Bi 0.5 Na 0.5 TiO 3 materials were approximately 51–106 Oe and 0.12–0.48 memu/g, respectively. These results were consistent with the recently observed M r and H C of transition-metal-doped lead-free and lead-based ferroelectric materials 8 – 11 , 60 , 64 – 68 . The nonzero M r and H C values of BaFeO 3−δ -modified Bi 0.5 Na 0.5 TiO 3 materials provided solid evidence for the presence of the ferromagnetic state at room temperature.…”

Section: Resultssupporting

confidence: 93%

“…7 a. The diamagnetism in pure Na 0.5 Bi 0.5 TiO 3 samples originated from the electronic configuration of Ti 4+ as 3 d °, whereas the weak ferromagnetism originated from self-defects 9 – 11 , 14 , 16 , 30 , 64 , 65 . The typical hysteresis loop of ferromagnetism was obtained for pure Na 0.5 Bi 0.5 TiO 3 materials after subtract the diamagnetic components, as shown in inset of Fig.…”

Section: Resultsmentioning

confidence: 98%

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Experimental and theoretical studies on induced ferromagnetism of new (1 − x)Na0.5Bi0.5TiO3 + xBaFeO3−δ solid solution

Dũng

Lam

Nguyen

et al. 2021

Sci Rep

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New solid solution of Na0.5Bi0.5TiO3 with BaFeO3−δ materials were fabricated by sol–gel method. Analysis of X-ray diffraction patterns indicated that BaFeO3−δ materials existed as a well solid solution and resulted in distortion the structure of host Na0.5Bi0.5TiO3 materials. The randomly incorporated Fe and Ba cations in the host Na0.5Bi0.5TiO3 crystal decreased the optical band gap from 3.11 to 2.48 eV, and induced the room-temperature ferromagnetism. Our density-functional theory calculations further suggested that both Ba for Bi/Na-site and Fe dopant, regardless of the substitutional sites, in Na0.5Bi0.5TiO3 lead to the induced magnetism, which is illustrated in terms of the exchange splitting between spin subbands through the crystal field theory and Jahn–Teller distortion effects. Our work proposes a simple method for fabricating lead-free ferroelectric materials with ferromagnetism property for multifunctional applications in smart electronic devices.

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Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 98%

Experimental and theoretical studies on induced ferromagnetism of new (1 − x)Na0.5Bi0.5TiO3 + xBaFeO3−δ solid solution

Dũng

Lam

Nguyen

et al. 2021

Sci Rep

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“…11 NBT is a lead-free material with perovskite (ABO 3 ) structure exhibiting a moderate remnant polarization (P r ), small coercive field (E c ), and a high Curie temperature of ~321°C. 12 Due to all these exceptional properties, it serves as a perfect alternative for lead-based dielectric materials. NBT is unique compared to other lead-free materials in the sense that it is a very good relaxor ferroelectric and depolarizes well below the Curie temperature.…”

Section: Introductionmentioning

confidence: 99%

“…Na 0.5 Bi 0.5 TiO 3 (NBT) is an excellent piezoelectric material with moderate dielectric and piezoelectric properties 11 . NBT is a lead‐free material with perovskite (ABO 3 ) structure exhibiting a moderate remnant polarization ( P r ), small coercive field ( E c ), and a high Curie temperature of ~321°C 12 . Due to all these exceptional properties, it serves as a perfect alternative for lead‐based dielectric materials.…”

Section: Introductionmentioning

confidence: 99%

Grain size engineered Ba_0.9Sr_0.1Ti_0.9Hf_0.1O₃‐Na_0.5Bi_0.5TiO₃ relaxor ceramics with improved energy storage performance

et al. 2020

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Novel lead‐free diphasic (1‐x)Ba0.9Sr0.1Ti0.9Hf0.1O3‐xNa0.5Bi0.5TiO3 (BSTH‐NBT) ceramic nanocomposites were synthesized via an economically viable modified mechano‐chemical activation technique. In the present investigation, we have developed an energy storage composite material by systematically optimizing the charge transport behavior and charge storage characteristics between the ferroelectric BSTH and piezoelectric NBT phase. The composite with x = 0.09 NBT concentration has shown the best energy storage properties with 1.61 J/cm3 discharge energy density along with 80.1% energy efficiency. The BSTH and NBT had a synergetic effect on the ferroelectric properties of the composites. The improvement in ferroelectric and piezoelectric properties along with excellent aging characteristics in composite materials is mainly attributed to enhancement in microstructural density, grain boundary interface, and stress effects. The improved dispersibility and excellent compatibility between BSTH and NBT phase have resulted in approximately 20% enhancement in breakdown strength of composite compared to pure BSTH ceramic.

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“…Co is a multi-valence element that can improve the performance of many functional ceramics. Accordingly, researchers have shown that Co doping can improve the dielectric properties of ceramics [25][26][27][28]. In this paper, CoO was added to fabricate the LiTaO 3 -based ceramics through a pressureless sintering process using raw CoO and LiTaO 3 powders.…”

Section: Introductionmentioning

confidence: 99%

Sinterability and Dielectric Properties of LiTaO3-Based Ceramics with Addition of CoO

Zhang

Yao

2020

Materials

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Lithium tantalite (LiTaO3) is a common piezoelectric and ferroelectric crystal, but the LiTaO3 polycrystalline ceramics have rarely been reported, and their refractory character presents difficulties in their fabrication. In this study, LiTaO3-based ceramics with different amounts of CoO were prepared by pressureless sintering at 1250 °C, and the effects of the amount of sintering aid on the sinterability, microstructure, and dielectric properties of the ceramics were investigated. The relative densities of the LiTaO3-based ceramics were significantly improved by the addition of CoO powder. The LiTaO3-based ceramics achieved the highest relative density (89.4%) and obtained a well-grained microstructure when the added amount of CoO was 5 wt.%. Only the LiTaO3 phase in the ceramics was observed, indicating that the ions Co diffused into the LiTaO3 lattices and mainly existed in two forms: Co2+ and Co3+. The effects of the added amount of CoO on the dielectric properties of the LiTaO3-based ceramics were studied thoroughly. Consequently, the dielectric constant was enhanced, and the dielectric loss decreased in the LiTaO3-based ceramics with the addition of CoO. The optimal value was obtained at 5 wt.% of CoO-added LiTaO3-based ceramics.

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Role of Co dopants on the structural, optical and magnetic properties of lead-free ferroelectric Na0.5Bi0.5TiO3 materials

Cited by 10 publications

References 23 publications

Experimental and theoretical studies on induced ferromagnetism of new (1 − x)Na0.5Bi0.5TiO3 + xBaFeO3−δ solid solution

Experimental and theoretical studies on induced ferromagnetism of new (1 − x)Na0.5Bi0.5TiO3 + xBaFeO3−δ solid solution

Grain size engineered Ba_0.9Sr_0.1Ti_0.9Hf_0.1O₃‐Na_0.5Bi_0.5TiO₃ relaxor ceramics with improved energy storage performance

Sinterability and Dielectric Properties of LiTaO3-Based Ceramics with Addition of CoO

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Role of Co dopants on the structural, optical and magnetic properties of lead-free ferroelectric Na0.5Bi0.5TiO3 materials

Cited by 10 publications

References 23 publications

Experimental and theoretical studies on induced ferromagnetism of new (1 − x)Na0.5Bi0.5TiO3 + xBaFeO3−δ solid solution

Experimental and theoretical studies on induced ferromagnetism of new (1 − x)Na0.5Bi0.5TiO3 + xBaFeO3−δ solid solution

Grain size engineered Ba0.9Sr0.1Ti0.9Hf0.1O3‐Na0.5Bi0.5TiO3 relaxor ceramics with improved energy storage performance

Sinterability and Dielectric Properties of LiTaO3-Based Ceramics with Addition of CoO

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Grain size engineered Ba_0.9Sr_0.1Ti_0.9Hf_0.1O₃‐Na_0.5Bi_0.5TiO₃ relaxor ceramics with improved energy storage performance