Crystal structures and microwave dielectric properties of Zn,W co-substituted BaTiO3 perovskite ceramics

Tian, Cailan; Yue, Zhenxing; Zhou, Yuanyuan; Li, Longtu

doi:10.1016/j.jssc.2012.08.054

Cited by 17 publications

(9 citation statements)

References 25 publications

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“…Similar types of microstructure evolution have been observed for the 3C to 6H conversion in Zn/W co‐doped BaTiO 3. Analyses by energy dispersive spectroscopy showed the chemical composition of each grain in the 3C pellet are identical within the error of EDS, while the 3C+6H sample showed small variations from grain to grain.…”

Section: Resultsmentioning

confidence: 87%

Infrared‐to‐ultraviolet light‐absorbing BaTiO₃‐based ferroelectric photovoltaic materials

Akbashev

Podpirka

et al. 2019

J Am Ceram Soc

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Ferroelectric oxides have been demonstrated to be promising in developing emerging photovoltaic technologies because of the various mechanisms that allow above-band-gap photovoltages and higher efficiencies. However, the wide band gaps of conventional ferroelectric oxides (2.7-4 eV) limit their utilization of the solar spectrum. Here the phase stability, absorption properties, ferroelectric, and photovoltaic responses of Ni-and Ni-Nb-substituted BaTiO 3 were explored to evaluate their potential as visible-light-absorbing photovoltaic materials. Although the acceptor substitution of Ni 2+ stabilized a hexagonal 6H polymorph in both systems, post-annealing treatments allowed restoration of a tetragonal 3C phase for Ba(Ti 0.99 Ni 0.01 )O 2.99 and (0.9)BaTiO 3 -(0.1)Ba(Ni 1/2 Nb 1/2 )O 2.75 . The oxygen vacancies accompanying the Ni and Ni-Nb substitutions significantly lower the optical band gap of BaTiO 3 to~1.5 eV and the visible light absorption can be systematically tuned between 380 and 1000 nm by varying the Ni:Nb ratio. Room temperature ferroelectricity was observed in Ba(Ti 0.99 Ni 0.01 )O 2.99 with a saturation polarization = 18 μC/cm 2 and remnant polarization = 1 μC/cm 2 . The Ni-Nb substituted composition (0.9)BaTiO 3 -(0.1)Ba(Ni 1/2 Nb 1/2 )O 2.75 shows a ferroelectric response with a remnant polarization of 5 μC/cm 2 at 77 K, which gradually decreases as temperature increases. Both compositions exhibit ferroelectrically switchable photoresponses under an AM 1.5 G sunlight simulator; the highest switchable steady-state current of 8 nA/cm 2 observed for (0.9)BaTiO 3 -(0.1)Ba (Ni 1/2 Nb 1/2 )O 2.75 exceeds those reported in previous studies of BaTiO 3 ceramic samples (J Solid State Chem, 1975; 12: 193; Jpn J Appl Phys, 2013; 52: 09KF03).

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Section: Resultsmentioning

confidence: 87%

Infrared‐to‐ultraviolet light‐absorbing BaTiO₃‐based ferroelectric photovoltaic materials

Akbashev

Podpirka

et al. 2019

J Am Ceram Soc

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“…The main crystal phases of all the samples could be indexed by BaTiO 3 crystal structures. The crystal structure of BaTiO 3 is known as ABO 3 type perovskite [18,19] structure with lattice parameter a 0 = b 0 = 3.9823 Å , c 0 = 3.9891 Å . However, a trace of two second phases, identified as Ba 6 Ti 17 O 40 and Ba 6 Ti 14 Nb 2 O 39 , are detected in the sample with 2.0-2.5 wt% Nb 2 O 5 .…”

Section: Resultsmentioning

confidence: 99%

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

Zhang

Gao

Zhang

2015

J Mater Sci: Mater Electron

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The influence of Nb 2 O 5 on the microstructure and dielectric properties, including temperature dependence of permittivity, dielectric loss, and Curie temperature, has been investigated on BaTiO 3 -Bi 0.5 Na 0.5 TiO 3 (abbreviated as BBT) ceramics. Experiments reveal that incorporation of a proper content of Nb 2 O 5 in BBT ceramics can control the grain growth, reduce the dielectric loss, shift the Curie temperature to higher temperatures and significantly improve temperature characteristics of the BaTiO 3 -Bi 0.5 Na 0.5 TiO 3 ceramics. As a result, a novel X10R material is developed in the system, which is very promising for practical use in X10R multilayer ceramic capacitors. With the addition of 2.0 wt% Nb 2 O 5 , the ceramics sintered at 1,150°C showed favorable dielectric properties at 25°C (e r = 1,730, tand = 1.39 9 10 -2 , and TCC = 12.0 %).

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“…The growth habit of grain with hexagonal structure is apt to growth into plant-like, while the cubic grain is round-like [7][8][9][10]20,21]. In this system, the hexagonal grains are round-like under the space constrain force coming from the dense ceramic in the sample x = 1.00.…”

Section: Chemical Compoundsmentioning

confidence: 98%

“…For instance, in perovskite ceramic systems of Ba[Ti 1Àx (M 0.5 W 0.5 ) x ]O 3 (M = Mg, Ni, Co, Zn) [7][8][9][10], their structures transferred from cubic to hexagonal and then to double cubic ones with increasing of the substitution amount (i.e., x). And it was also found that the hexagonal perovskite had lower dielectric constant (e r ), higher quality factor (Q Â f), and especially the near-zero temperature coefficient of resonant frequency (t f ) than that of cubic one.…”

Section: Introductionmentioning

confidence: 99%

Microwave dielectric properties of Ba[Ti0.4Ga0.3Nb0.3(1−x)Sb0.3x]O3 perovskite ceramics

Tian

Yue

Zhou

2013

Materials Research Bulletin

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Crystal structures and microwave dielectric properties of Zn,W co-substituted BaTiO3 perovskite ceramics

Cited by 17 publications

References 25 publications

Infrared‐to‐ultraviolet light‐absorbing BaTiO₃‐based ferroelectric photovoltaic materials

Infrared‐to‐ultraviolet light‐absorbing BaTiO₃‐based ferroelectric photovoltaic materials

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

Microwave dielectric properties of Ba[Ti0.4Ga0.3Nb0.3(1−x)Sb0.3x]O3 perovskite ceramics

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Crystal structures and microwave dielectric properties of Zn,W co-substituted BaTiO3 perovskite ceramics

Cited by 17 publications

References 25 publications

Infrared‐to‐ultraviolet light‐absorbing BaTiO3‐based ferroelectric photovoltaic materials

Infrared‐to‐ultraviolet light‐absorbing BaTiO3‐based ferroelectric photovoltaic materials

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

Microwave dielectric properties of Ba[Ti0.4Ga0.3Nb0.3(1−x)Sb0.3x]O3 perovskite ceramics

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Infrared‐to‐ultraviolet light‐absorbing BaTiO₃‐based ferroelectric photovoltaic materials

Infrared‐to‐ultraviolet light‐absorbing BaTiO₃‐based ferroelectric photovoltaic materials