Effect of LiF addition on phase structure and piezoelectric properties of (Ba,Ca)(Ti,Sn)O3 ceramics sintered at low temperature

Zhou, Pengfei; Zhang, Bo‐Ping; Zhao, Lei; Zhu, Lifeng

doi:10.1016/j.ceramint.2014.11.094

Cited by 25 publications

(8 citation statements)

References 29 publications

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“…This presents the "pinning" hysteresis loops compared to a normal ferroelectric P-E hysteresis loop. 22 BCTSH + 3 Mn ceramics presents a slim loop compared to the inward loops of BCTSH + 1 Mn and BCTSH + 2 Mn. The slim loop of BCTSH + 3 Mn means the disorder of lattice, which is due to the more defect dipoles.…”

Section: Resultsmentioning

confidence: 99%

Enhanced temperature stability and quality factor with Hf substitution for Sn and MnO2 doping of (Ba0.97Ca0.03)(Ti0.96Sn0.04)O3 lead-free piezoelectric ceramics with high Curie temperature

et al. 2016

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In this work, the process of two-stage modifications for (Ba0.97Ca0.03)(Ti0.96Sn0.04-xHfx)O3 (BCTS4-100xH100x) ceramics was studied. The trade-off composition was obtained by Hf substitution for Sn and MnO2 doping (two-stage modification) which improves the temperature stability and piezoelectric properties. The phase structure ratio, microstructure, and dielectric, piezoelectric, ferroelectric, and temperature stability properties were systematically investigated. Results showed that BCTS4-100xH100x piezoelectric ceramics with x=0.035 had a relatively high Curie temperature (TC) of about 112 °C, a piezoelectric charge constant (d33) of 313 pC/N, an electromechanical coupling factor (kp) of 0.49, a mechanical quality factor (Qm) of 122, and a remnant polarization (Pr) of 19μC/cm2. In addition, the temperature stability of the resonant frequency (fr), kp, and aging d33 could be tuned via Hf content. Good piezoelectric temperature stability (up to 110 °C) was found with x =0.035. BCTS0.5H3.5 + a mol% Mn (BCTSH + a Mn) piezoelectric ceramics with a = 2 had a high TC of about 123 °C, kp ∼ 0.39, d33 ∼ 230 pC/N, Qm ∼ 341, and high temperature stability due to the produced oxygen vacancies. This mechanism can be depicted using the complex impedance analysis associated with a valence compensation model on electric properties. Two-stage modification for lead-free (Ba0.97Ca0.03)(Ti0.96Sn0.04)O3 ceramics suitably adjusts the compositions for applications in piezoelectric motors and actuators.

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Section: Resultsmentioning

confidence: 99%

Enhanced temperature stability and quality factor with Hf substitution for Sn and MnO2 doping of (Ba0.97Ca0.03)(Ti0.96Sn0.04)O3 lead-free piezoelectric ceramics with high Curie temperature

et al. 2016

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“…Many investigations have been carried out to construct the phase boundary in the BT‐based ceramics using different categories of additives, resulting in the enhancement of piezoelectricity . For example, when the BT material are codoped with Ca 2+ and Zr 4+ or Ca 2+ and Sn 4+ , the materials such as (Ba,Ca)(Ti,Zr)O 3 and (Ba,Ca)(Ti,Sn)O 3 show a high piezoelectric coefficient d 33 of larger than 400 pC/N. In general, the substitutions of Ca 2+ for Ba 2+ and Zr 4+ and/or Sn 4+ for Ti 4+ lead to the simultaneous shift of R‐O and O‐T phase transitions toward high temperatures at different rates and thus the R‐T biphase boundary is formed; as a result, the enhanced piezoelectricity is exhibited near the R‐T phase boundary Based on the polarization deflection theory proposed by Fu and Cohen, the increasing number of spontaneous polarization direction would induce stronger piezoelectricity for perovskite piezoelectric ceramics .…”

Section: Introductionmentioning

confidence: 99%

Phase coexistence and large piezoelectricity in BaTiO₃‐CaSnO₃ lead‐free ceramics

et al. 2018

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Ferroelectric phase coexistence was constructed in (1−x)BaTiO3‐xCaSnO3 lead‐free ceramics, and its relationship with the piezoelectricity of the materials was investigated to ascertain potential factors for strong piezoelectric response. It is found that the addition of CaSnO3 caused a series of phase transitions in the (1−x)BaTiO3‐xCaSnO3 ceramics, and a ferroelectric coexistence of rhombohedral, orthorhombic, and tetragonal phases is formed at x = 0.08, where the ceramics exhibit the lowest energy barrier and consequently facilitate the polarization rotation and extension, resulting in the optimal piezoelectricity of d33 and kp values of 550 pC/N and 0.60, respectively. Our study provides an intuitive insight to understand the origin of high piezoelectricity in the ceramics with the coexistence of multiferroelectric phases.

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“…Moreover, the ferroelectric domains could be rotated easily in the large gain size, which is the other reason why P r initially increased with a small addition of praseodymium contents (<0.45 mol%) . The detected P r was a little weaker than the literature reports, which might be attribute to the relatively deteriorated polarization alignment with weakened long‐range ferroelectric dipole order . The receded E c with a small addition of x was caused by weak internal stress because of the subtle distorted structure and inferior pinching effects of the domain wall with a negligible volume of oxygen vacancies .…”

Section: Resultsmentioning

confidence: 81%

“…It is obviously observed that the strength of the relative permittivity peak first elevated and then receded, while the value of tan δ initially receded and then elevated with increasing x . The elevated dielectric properties with a small addition of x was attributed to the decreased volume of oxygen vacancies

true(V_{o}^{\cdot \cdot} true)

as the substitution position of the A sites by Pr 3+ ions in the ABO 3 structure, and the defect mechanism is displayed in Equation . However, Pr 3+ ions move on to substitute the B sites in the structure with excessive x , the oxygen vacancies emerged again and the oxygen vacancies volumes increased (Equation ), accompanying with intensive carrier migration between defect complexes

{(3 P {normalr}^{'}_{Ti/Zr}^{} ‐ {normalV}_{normalO}^{\cdot \cdot}_{}^{})}^{'}

and

{(P {normalr}^{'}_{Ti/Zr}^{} ‐ {normalV}_{normalo}^{\cdot \cdot}_{}^{})}^{\cdot}

(Equation ), which led to the deteriorated dielectric properties of the ceramics .…”

Section: Resultsmentioning

confidence: 99%

Electrical Properties and Thermal Expansion Characteristics of (1–x)Ba_0.948Ca_0.05Er_0.002Ti_0.94Zr_0.06O₃–(x)Pr Lead‐Free Piezoelectric Ceramics Sintered at a Low‐Temperature

Tian

Cao

et al. 2018

Physica Status Solidi (a)

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1 À x)Ba 0.948 Ca 0.05 Er 0.002 Ti 0.94 Zr 0.06 O 3 -(x)Pr (x ¼ 0-0.75 mol%) ceramics are sintered at 1240 C by conventional solid-state reaction method using the assynthesized nanoparticles, which are prepared by a modified Pechini method. The structural, morphological, electrical, and thermal expansion properties as a function of varying x are systematically investigated. All samples feature rhombohedral phase, and their lattice parameters are accurately calculated by Rietveld refinement software. Volume of oxygen vacancies initially decreases and then increases with increasing x, leading to diversified electrical properties. Deteriorated electrical properties of the ceramics with excessive x are attributed to the increment of defect complexes with a large volume of oxygen vacancies. The coefficient of thermal expansion values of the ceramics that is influenced by phase evolution and structure defects under different temperature ranges are studied. The respective optimal electrical properties, that is, d 33 ¼ 186 pC N À1 and k p ¼ 27.2% are obtained at x ¼ 0.30 mol%. This research is believed to be insightful to practical application of the lead-free multifunctional electron components.

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Effect of LiF addition on phase structure and piezoelectric properties of (Ba,Ca)(Ti,Sn)O3 ceramics sintered at low temperature

Cited by 25 publications

References 29 publications

Enhanced temperature stability and quality factor with Hf substitution for Sn and MnO2 doping of (Ba0.97Ca0.03)(Ti0.96Sn0.04)O3 lead-free piezoelectric ceramics with high Curie temperature

Enhanced temperature stability and quality factor with Hf substitution for Sn and MnO2 doping of (Ba0.97Ca0.03)(Ti0.96Sn0.04)O3 lead-free piezoelectric ceramics with high Curie temperature

Phase coexistence and large piezoelectricity in BaTiO₃‐CaSnO₃ lead‐free ceramics

Electrical Properties and Thermal Expansion Characteristics of (1–x)Ba_0.948Ca_0.05Er_0.002Ti_0.94Zr_0.06O₃–(x)Pr Lead‐Free Piezoelectric Ceramics Sintered at a Low‐Temperature

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Effect of LiF addition on phase structure and piezoelectric properties of (Ba,Ca)(Ti,Sn)O3 ceramics sintered at low temperature

Cited by 25 publications

References 29 publications

Enhanced temperature stability and quality factor with Hf substitution for Sn and MnO2 doping of (Ba0.97Ca0.03)(Ti0.96Sn0.04)O3 lead-free piezoelectric ceramics with high Curie temperature

Enhanced temperature stability and quality factor with Hf substitution for Sn and MnO2 doping of (Ba0.97Ca0.03)(Ti0.96Sn0.04)O3 lead-free piezoelectric ceramics with high Curie temperature

Phase coexistence and large piezoelectricity in BaTiO3‐CaSnO3 lead‐free ceramics

Electrical Properties and Thermal Expansion Characteristics of (1–x)Ba0.948Ca0.05Er0.002Ti0.94Zr0.06O3–(x)Pr Lead‐Free Piezoelectric Ceramics Sintered at a Low‐Temperature

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Phase coexistence and large piezoelectricity in BaTiO₃‐CaSnO₃ lead‐free ceramics

Electrical Properties and Thermal Expansion Characteristics of (1–x)Ba_0.948Ca_0.05Er_0.002Ti_0.94Zr_0.06O₃–(x)Pr Lead‐Free Piezoelectric Ceramics Sintered at a Low‐Temperature