Investigation of the structural, microstructural, and dielectric properties of Ho-doped PbTiO3 for piezoelectric applications

Belhajji, Mounir; Moutaouaffiq, Adil; Nfissi, Aziz; Sayouri, S.; Lamcharfi, T.

doi:10.1007/s10854-021-07323-1

Cited by 5 publications

(3 citation statements)

References 20 publications

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“…The real part ε′ r of the complex permittivity of the (1-x)NBT-xBT samples sintered at 1100 °C for 4 hours. [11] 0,0 5,0x10 1,0x10 6 1,5x10 6 2,0x10 On the other hand, Belhajji et al [21] observed the same behaviour with regards to the permittivity as a function of the frequency, relating this shift in the T ≥ 505 °C range by the probable competition between the thermal energy and applied electric field. Moreover, this displacement phenomenon of the resonance frequency to low frequencies (T ≤ 350 °C) and the increase in the dielectric constant in this temperature range can be due to a particular process of polarisation related to the increase in the number of dipoles or, more precisely, to the increase in the number of dipolar orientations governed by the decrease in the degree of dipolar disorder in the ferroelectric phase.…”

Section: Dielectric Investigationsmentioning

confidence: 76%

Impedance spectroscopy and permittivity study of (1-x)NBT-xBT ceramics

Mesrar¹

2022

Ceramics - Silikaty

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The complex impedance spectroscopy method was applied to evaluate the profound characteristics of the electrical transport capacity of lead-free ferroelectric ceramic solid solutions of (1-x)(Na 0.5 Bi 0.5 )TiO 3-x Ba TiO 3 (NBT-xBT) (0.00 ≤ x ≤ 0.10). The elaboration of NBT-xBT, via a solid-state reaction between (Na 0.5 Bi 0.5 )TiO 3 and BaTiO 3 , was determined using X-ray diffraction. Refinements, at room temperature, identified a rhombohedral phase, space group R3c for x = 0.0 and 0.03, which possesses an antiphase, corresponding to the tilting system ā ā ā with an angle of inclination of 8.24° according to Glazer's notation. We used the complex impedance, complex electric Cole-Cole diagram and frequency-dependent AC conductivity analysis to examine the relaxation and conduction mechanism in these samples, which exhibit non-Debye type behaviour. In addition, using an equivalent circuit composed of resistance and capacitance, we examined the different contributions (grains and grain boundaries) in our samples. (Na 0.5 Bi 0.5 )TiO 3 exhibits a dielectric resonance, which manifests itself as negative permittivity. The resonance development of NBT-xBT in the range (500 Hz − 2 MHz) is discussed in this paper.

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Section: Dielectric Investigationsmentioning

confidence: 76%

Impedance spectroscopy and permittivity study of (1-x)NBT-xBT ceramics

Mesrar¹

2022

Ceramics - Silikaty

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“…As indicated above, the dielectric constant of all specimens stays positive up to the resonant frequency ( f r ) and negative above this frequency. , In the case of pure NBT, as the frequency increases, the dielectric constant increases steadily, then, in the vicinity of the anomaly noted A, it increases and reaches a maximum, at this frequency, which corresponds to the so-called resonance frequency ( f r ), and then decreases rapidly for a frequency in the vicinity of the anomaly B, known as antiresonance ( f a ). This particular type of peaking behavior is associated with resonance mechanisms. − …”

Section: Resultsmentioning

confidence: 99%

Studies of Structural, Dielectric, and Impedance Spectroscopy of KBT-Modified Sodium Bismuth Titanate Lead-Free Ceramics

et al. 2022

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Lead-free ceramic materials produced from bismuth sodium titanate (Na0.5Bi0.5TiO3, NBT)–bismuth potassium titanate (K0.5Bi0.5TiO3, KBT) have been developed through a solid-state reaction technique. The structural, dielectric, and piezoelectric characteristics of the ceramic materials were analyzed. Based on the XRD investigation, the morphotropic phase boundary (MPB) was determined for the composition (x (%) = 16 and 20). The effects of the KBT phase on the NBT lattice were examined using the charge density distribution. Furthermore, the dielectric properties indicated the presence of a negative dielectric constant (εr′) as a function of frequency between 1 kHz and 2 MHz. Negative permittivity was observed globally in the (1 – x)NBT–xKBT ceramic which reflects the effect of the dielectric resonance. The grain conduction effect is revealed through the complex impedance spectrum in the form of a semicircular arc within the Nyquist plot. In addition, the samples studied revealed a non-Debye relaxation phenomenon. The relaxation time was determined based on the Vogel-Fulcher law for all samples. DC conductivity was carried out on the ceramics material and revealed that the resistance decreases with increasing temperature indicating a negative temperature coefficient of resistance. The AC conductivity as a function of frequency for different temperatures suggests the presence of a thermally activated conduction mechanism. The activation energy has been determined based on the Arrhenius plot of the DC electrical conductivity as well as the relaxation frequency.

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“…This decrease can be attributed to the temperature-induced misalignment of corresponding dipoles. On the contrary, Belhajji et al 65 noted a comparable pattern in the permittivity response to frequency, attributing this behavior to the potential competition between thermal energy and the applied electric field. Furthermore, the anomaly (A) undergoes a shift toward higher frequencies with an elevation in temperature, spanning from 120 to 200 °C, across all samples (refer to Table 3).…”

Section: Examination Of Charge Density Through Structural Factors In ...mentioning

confidence: 96%

Study on the Structure, Morphology, Dielectric, and Piezoelectric Properties of Large-Grain (Ba_0.85Sr_0.15)_1–xPb_xTiO₃ Ceramic System for 0.02 ≤ x ≤ 0.08

Mesrar,

Elbasset

et al. 2024

ACS Omega

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Ba 0.85 Sr 0.15 ) 1−x Pb x TiO 3 ), along with various compositions (x(mol %) = 0, 2, 4, and 8), was synthesized through the conventional sol−gel reaction method. Following this, the resultant powders underwent a carefully controlled calcination process at 1000 °C for a period of 4 h. The examination of the crystalline phase of the calcined ceramics was conducted at room temperature using X-ray diffraction. Rietveld refinement of the XRD data, performed using FullProf, revealed that the samples exhibited a tetragonal structure within the space group P4mm. The impact of Pb doping on the lattice structure of BaSr 1−x TiO 3 was explored by analyzing the charge density distribution. The FTIR analysis unveiled a distinct absorptive band within the 450−600 cm −1 range, indicative of the stretching and bending vibrations associated with TiO 6 octahedra. Notably, sintering the material at 1150 °C for 4 h resulted in improved densification, as observed in scanning electron microscopy images showcasing a nearly uniform distribution of densely packed grains. Through the utilization of Williamson−Hall plots derived from XRD data, the average particle diameter was estimated to fall within the range of 131.87−141 nm, with an associated uncertainty ranging from 5 to 10%. Additionally, the dielectric characteristics unveiled the presence of a negative dielectric constant (ε r ) spanning the frequency range from 1 kHz to 2 MHz. The (Ba 0.85 Sr 0.15 ) 1−x Pb x TiO 3 ceramic displayed a widespread occurrence of negative permittivity, emphasizing the influence of dielectric resonance. The investigation revealed that the sintered ceramic with the formula (Ba 0.85 Sr 0.15 ) 1−x Pb x TiO 3 exhibited exceptional piezoelectric properties, achieving the highest piezoelectric constant (d 33 = 137 pC/N) and electromechanical coupling factor (k p = 0.49).

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Investigation of the structural, microstructural, and dielectric properties of Ho-doped PbTiO3 for piezoelectric applications

Cited by 5 publications

References 20 publications

Impedance spectroscopy and permittivity study of (1-x)NBT-xBT ceramics

Impedance spectroscopy and permittivity study of (1-x)NBT-xBT ceramics

Studies of Structural, Dielectric, and Impedance Spectroscopy of KBT-Modified Sodium Bismuth Titanate Lead-Free Ceramics

Study on the Structure, Morphology, Dielectric, and Piezoelectric Properties of Large-Grain (Ba_0.85Sr_0.15)_1–xPb_xTiO₃ Ceramic System for 0.02 ≤ x ≤ 0.08

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Investigation of the structural, microstructural, and dielectric properties of Ho-doped PbTiO3 for piezoelectric applications

Cited by 5 publications

References 20 publications

Impedance spectroscopy and permittivity study of (1-x)NBT-xBT ceramics

Impedance spectroscopy and permittivity study of (1-x)NBT-xBT ceramics

Studies of Structural, Dielectric, and Impedance Spectroscopy of KBT-Modified Sodium Bismuth Titanate Lead-Free Ceramics

Study on the Structure, Morphology, Dielectric, and Piezoelectric Properties of Large-Grain (Ba0.85Sr0.15)1–xPbxTiO3 Ceramic System for 0.02 ≤ x ≤ 0.08

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Study on the Structure, Morphology, Dielectric, and Piezoelectric Properties of Large-Grain (Ba_0.85Sr_0.15)_1–xPb_xTiO₃ Ceramic System for 0.02 ≤ x ≤ 0.08