Dielectric behavior and impedance analysis of lead-free CuO doped (Na0.50K0.50)0.95(Li0.05Sb0.05Nb0.95)O3 ceramics

Rani, Rashmi; Sharma, Seema; Rai, Radheshyam; Kholkin, A. L.

doi:10.1016/j.solidstatesciences.2012.10.025

Cited by 19 publications

(11 citation statements)

References 38 publications

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“…Table 1 lists the fitted parameters of the randomly-oriented and textured ceramics. The ac conductivity is obtained in accordance with the literature [37]. Figure 6a,b show the plot of ac conductivity (σ ac ) versus frequency at different temperatures.…”

Section: Resultssupporting

confidence: 60%

Dielectric and Piezoelectric Properties of Textured Lead-Free Na0.5Bi0.5TiO3-Based Ceramics

et al. 2019

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This work provides a comparative study of the dielectric and piezoelectric properties of randomly oriented and textured 0.88Na0.5Bi0.5TiO3-0.08K0.5Bi0.5TiO3-0.04BaTiO3 (88NBT) ceramics. Textured ceramics were fabricated by template grain growth (TGG) method using NaNbO3 (NN) for templates. For textured ceramics with 4 wt% NN templates, a Lotgering factor of 96% and piezoelectric coefficient d33 of 185 pC/N were obtained. Compared to the randomly oriented ceramics, textured ceramics show lower strain hysteresis (H = 7.6%), higher unipolar strain of 0.041% with corresponding large signal piezoelectric coefficient d33* of 200 pm/V at applied field of 2 kV/mm. This enhancement can be explained by the grain orientation along <001> direction by texturing, where an engineered domain configuration is formed after polarization, leading to decreased hysteresis and increased piezoelectric property.

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Section: Resultssupporting

confidence: 60%

Dielectric and Piezoelectric Properties of Textured Lead-Free Na0.5Bi0.5TiO3-Based Ceramics

et al. 2019

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“…The boundary frequency of these two regions is known as hopping frequency [39,40]. At higher temperature (400ºC -500ºC), AC conductivity behaved differently.…”

Section: Ac Conductivitymentioning

confidence: 99%

Structure and electrical properties of lead-free Bi_0.5Na_0.5TiO₃-based ceramics for energy-storage applications

et al. 2016

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optimum energy-storage properties were obtained in 0.90(BNT-BT)-0.10NT with energy-storage density of 1.2 J/cm 3 and energy-storage efficiency of 74.8% at 10 kV/mm. The results demonstrate that (1 -x)(BNT-BT)-xNT ceramics are promising candidate for high-temperature energy-storage application. IntroductionCapacitors play an important role in energy-storage system. Compared to batteries, capacitors possess faster charge-discharge time and higher power density [1,2]. However, the energy that capacitor dielectrics can store is much less than fuel cells or lithium ion batteries [3]. Thus, the development of new capacitor materials with high energy-storage capacity is a challenge for researchers. Additionally, since electronic equipment is often exposed to extreme temperatures in industrial applications, such as space exploration and deep oil / gas well drilling [4,5], the temperature reliability of capacitor materials is also very important. Bi 0.5 Na 0.5 TiO 3 (BNT) based ceramics have been actively studied for energy-storage application in recent years [6-10]. Among the reported systems, (1x)Bi 0.5 Na 0.5 TiO 3 -xBaTiO 3 (BNT-BT) binary solid solution at the morphotropic phase boundary (MPB, 0.06 ≤ x ≤ 0.10)[11] is a promising candidate for high-temperature energy-storage capacitors. On the one hand, the existence of double dielectric anomalies over the studied temperature range can help to improve the temperature stability of the dielectric properties. On the other hand, BNT-BT shows large maximum polarization, which is favorable for obtaining high energy-storage density. Modifications of BNT-based high-temperature energy-storage ceramics focus on expanding the temperature range with stable permittivity, as well as improving their energy-storage density and efficiency. Niobates are the most widely reported members to modify the dielectric and ferroelectric properties of BNT-based ceramics, such as NaNbO 3 [12, 13], KNbO 3 [14, 15], (Li, Ag)NbO 3 [16], Na 0.5 K 0.5 NbO 3 [17-20], and (Na, Bi)NbO 3 [21]. Tantalum and niobium belong to same family in the periodic table of elements. According to J. König [22] and M. Spreitzer [23], tantalate addition can significantly broaden the dielectric anomaly of BNT ceramics. However, the exact dielectric temperature stability has not been reported, neither has the effect of tantalate on the ferroelectric properties.To explore the potential use of tantalate modified BNT-based ceramics for temperature-stable energy-storage application, a new system based on (1x)(0.92Bi 0.5 Na 0.5 TiO 3 -0.08BaTiO 3 )-xNaTaO 3 ((1 -x)(BNT-BT)-xNT) ternary solid solution was prepared in this work. The effects of NT on the structure, dielectric stability, electrical properties, and energy-storage properties of the system were comprehensively investigated. Experimental Procedure(1 -x)(BNT-BT)-xNT (x = 0.01, 0.03, 0.05, 0.10, 0.15) ceramic samples were prepared by traditional solid-state reaction method [8,[24][25][26]. First, the raw powders Bi 2 O 3 (purity 99.0%), Na 2 CO 3 (purity 99.8%), TiO 2 (p...

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“…E a of all the compositions were estimated to be 1.24-1.55 eV. Oxygen vacancies are the most mobile charges in oxide ferroelectrics and play an important role in the conduction process in most dielectric ceramics [36,37]. At high temperature, doubly-ionized V ·· O can move due to thermal activation [38] with E a = 1.005-1.093 eV [39][40][41].…”

Section: Tablementioning

confidence: 99%

Electrical properties and relaxation behavior of Bi0.5Na0.5TiO3-BaTiO3 ceramics modified with NaNbO3

Lanagan

Luo

et al. 2016

Journal of the European Ceramic Society

111

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Dielectric behavior and impedance analysis of lead-free CuO doped (Na0.50K0.50)0.95(Li0.05Sb0.05Nb0.95)O3 ceramics

Cited by 19 publications

References 38 publications

Dielectric and Piezoelectric Properties of Textured Lead-Free Na0.5Bi0.5TiO3-Based Ceramics

Dielectric and Piezoelectric Properties of Textured Lead-Free Na0.5Bi0.5TiO3-Based Ceramics

Structure and electrical properties of lead-free Bi_0.5Na_0.5TiO₃-based ceramics for energy-storage applications

Electrical properties and relaxation behavior of Bi0.5Na0.5TiO3-BaTiO3 ceramics modified with NaNbO3

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Dielectric behavior and impedance analysis of lead-free CuO doped (Na0.50K0.50)0.95(Li0.05Sb0.05Nb0.95)O3 ceramics

Cited by 19 publications

References 38 publications

Dielectric and Piezoelectric Properties of Textured Lead-Free Na0.5Bi0.5TiO3-Based Ceramics

Dielectric and Piezoelectric Properties of Textured Lead-Free Na0.5Bi0.5TiO3-Based Ceramics

Structure and electrical properties of lead-free Bi0.5Na0.5TiO3-based ceramics for energy-storage applications

Electrical properties and relaxation behavior of Bi0.5Na0.5TiO3-BaTiO3 ceramics modified with NaNbO3

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Structure and electrical properties of lead-free Bi_0.5Na_0.5TiO₃-based ceramics for energy-storage applications