Effects of Nb2O5 addition on the microstructure and dielectric properties of BaTiO3–Bi0.5Na0.5TiO3 ceramics

Zhang, Yonggang; Gao, Shenghan; Zhang, Baolin

doi:10.1007/s10854-015-2746-4

Cited by 6 publications

(3 citation statements)

References 25 publications

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“…The shift in T m towards higher degree in NBT-n could be due to the generation of internal stress during cooling across the phase transition (i.e. T m ) after sintering [28,29].…”

Section: High Temperature Dielectric Measurements and Analysismentioning

confidence: 99%

Structural and microstructural correlation with ferroelectric and dielectric properties of nanostructured Na0.5Bi0.5TiO3 ceramics

Sahu

Karthik

Srinivas

et al. 2015

J Mater Sci: Mater Electron

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Polycrystalline Na 0.5 Bi 0.5 TiO 3 (NBT) ceramics were synthesized by using sol-gel and solid state reaction techniques with an average grain size of %240 nm and %14 lm respectively. Structural analysis confirmed the R3c phase-stabilization in both bulk and nano-NBT. The lattice strain analysis estimated by using W-H plot from the XRD profiles revealed the strain was compressive in NBT-nano. Phonon life times (s) of Na/Bi-O, Ti-O and TiO 6 phonon modes were decreased in NBT-nano due to the grain size effect. Microstructure of NBT-nano displayed an enormous rise in the number of grain boundaries than NBT-bulk. Ferroelectric loops became slanted in NBT-nano due to the multi-domain to mono-domain transformation. The mono-domain transition eased the domain reversal and switching, which in-turn lowered the E c value in NBT-nano (i.e. E c = 45 kV/cm). The clamping effect caused by grain size reduction in NBT-nano leads to reduced P r value (P r = 25.2 lC/cm 2 ). The compressive strain developed in the crystal lattice of NBT-nano leads to an increase in T m (i.e. 335°C). The variation in diffusivity parameter (c) and degree of correlation strength q(T) between the polar nano regions were found to be the cause for enhanced relaxor features in NBT-nano.Electronic supplementary material The online version of this article (

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“…The shift in T m towards higher degree in NBT-n could be due to the generation of internal stress during cooling across the phase transition (i.e. T m ) after sintering [28,29].…”

Section: High Temperature Dielectric Measurements and Analysismentioning

confidence: 99%

Structural and microstructural correlation with ferroelectric and dielectric properties of nanostructured Na0.5Bi0.5TiO3 ceramics

Sahu

Karthik

Srinivas

et al. 2015

J Mater Sci: Mater Electron

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“…Consequently, the BaTiO 3 -(Bi 0.5-Na 0.5 )TiO 3 (BTBNT) system has been developed for high-temperature dielectric applications. [10][11][12][13][14][15][16] And some researches have enhanced the ceiling temperature of the BTBNT-based materials, even up to 450°C, while still maintaining high dielectric constant. 17,18 To develop the X9R-type ceramics with high-temperature characteristics, the key is to form the core-shell structure to meet the requirements for temperature-insensitive characteristics of the capacitance and a reliable performance in MLCCs.…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, the BaTiO 3 -(Bi 0.5 Na 0.5 )TiO 3 (BTBNT) system has been developed for high-temperature dielectric applications. 10-16 And some researches have enhanced the ceiling temperature of the BTBNT-based materials, even up to 450°C, while still maintaining high dielectric constant. 17,18…”

Section: Introductionmentioning

confidence: 99%

Nb-doped BaTiO₃-(Bi_0.5Na_0.5)TiO₃ceramics with core-shell structure for high-temperature dielectric applications

Shen

Wang

et al. 2016

Advances in Applied Ceramics

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Nb-doped 0.90BaTiO 3 -0.10(Bi 0.5 Na 0.5 )TiO 3 temperature-insensitive ceramics with novel core-shell structure were sintered at low temperature by the conventional solid-state reaction method. The beneficial role of Nb in facilitating the formation of core-shell structure because of chemical inhomogeneity is verified, which is responsible for the weak temperature dependence of dielectric properties. Temperature dependence of permittivity measured at different frequencies shows high frequency dispersion at low temperature, while without relaxor characteristic at high temperature. The Vogel-Fulcher model was adopted to study the relaxor behaviour of Nb-doped 0.90BaTiO 3 -0.10(Bi 0.5 Na 0.5 )TiO 3 ceramics at low temperature. The samples with an addition of 1.5 mol% Nb 2 O 5 provide a temperature coefficient of capacitance meeting the requirements of the X9R characteristic, and result exhibits an optimum dielectric behaviour of ε r ∼1900, tanδ ∼1.8% at room temperature, making the material a promising candidate for high temperature applications. IntroductionMultilayer ceramic capacitors (MLCCs) have been widely used in many kinds of electronic products since they were first developed in 1960s. 1,2 The capability of its withstanding temperature being over 150°C is quite crucial and essential for their application in oil drilling, aerospace and other fields. To integrate the power transistors and smart power devices into the electromechanical actuator, it is also important for MLCC power devices to be able to operate at 175-200°C. 2 However, neither the X7R (−55 to 125°C, ΔC/C 25°C ≤ ±15%) nor the X8R-type (−55 to 150°C, ΔC/C 25°C ≤ ±15%) MLCCs defined by the Electronic Industries Association (EIA) standards are competent as their ceiling temperatures are 125°C and 150°C , respectively. 3-6 Therefore, it is necessary to exploit a material used for X9R-type (−55 to 200°C, ΔC/C 25°C ≤ ±15%) MLCCs, then developing a new temperatureinsensitive material that can withstand higher temperature (≥200°C) and show weak temperature dependence of properties, might be the only alternative approach.As well known, most high-temperature dielectrics are based on the barium titanate (BaTiO 3 ) materials.However, it is difficult to prepare pure BaTiO 3 (BT) ceramics with weak temperature dependence due to the dramatic variation of permittivity above the Curie temperature (T c = 130°C). In order to obtain hightemperature BaTiO 3 -based dielectrics, the first step is to escalate T c point. It has been reported that T c can be raised up by replacing Ba sites with smaller ionic radius elements, but such effect is not sufficient. 2,7 Moreover, though Pb ions are very beneficial in raising T c , the use of lead-based ceramics has been restricted due to its toxicity. Another way to increase T c is to combine BT with materials with high T c . (Bi 0.5 Na 0.5 )TiO 3 (BNT) is an attractive candidate material because of its strong ferroelectricity at room temperature and relatively high T c (∼320°C). 8,9 Additionally, BNT can form solid solution w...

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SiO2–Fe2O3–MoO3 ceramic system doped with Nb2O5, a study of the dielectric temperature dependence

Silva

Sombra

Graça

2016

J Mater Sci: Mater Electron

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Effects of Nb2O5 addition on the microstructure and dielectric properties of BaTiO3–Bi0.5Na0.5TiO3 ceramics

Cited by 6 publications

References 25 publications

Structural and microstructural correlation with ferroelectric and dielectric properties of nanostructured Na0.5Bi0.5TiO3 ceramics

Structural and microstructural correlation with ferroelectric and dielectric properties of nanostructured Na0.5Bi0.5TiO3 ceramics

Nb-doped BaTiO₃-(Bi_0.5Na_0.5)TiO₃ceramics with core-shell structure for high-temperature dielectric applications

SiO2–Fe2O3–MoO3 ceramic system doped with Nb2O5, a study of the dielectric temperature dependence

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Effects of Nb2O5 addition on the microstructure and dielectric properties of BaTiO3–Bi0.5Na0.5TiO3 ceramics

Cited by 6 publications

References 25 publications

Structural and microstructural correlation with ferroelectric and dielectric properties of nanostructured Na0.5Bi0.5TiO3 ceramics

Structural and microstructural correlation with ferroelectric and dielectric properties of nanostructured Na0.5Bi0.5TiO3 ceramics

Nb-doped BaTiO3-(Bi0.5Na0.5)TiO3ceramics with core-shell structure for high-temperature dielectric applications

SiO2–Fe2O3–MoO3 ceramic system doped with Nb2O5, a study of the dielectric temperature dependence

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Nb-doped BaTiO₃-(Bi_0.5Na_0.5)TiO₃ceramics with core-shell structure for high-temperature dielectric applications