Enhanced magnetoelectric coupling in Ti and Ce substituted lead free CFO-BCZT laminate composites

Praveen, J. Paul; Monaji, Vinitha Reddy; Chandrakala, E.; Indla, Srinivas; Kumar, Sandeep; Subramanian, V.; Das, Dibakar

doi:10.1016/j.jallcom.2018.04.026

Cited by 46 publications

(8 citation statements)

References 36 publications

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“…CoFe 2 O 4 (CFO) has the highest magnetostriction coefficient (λ s ∼ 180) among all of the ferrites, 14 which could promote the crystallization of the ferroelectric β-phase of P(VDF-TrFE) copolymers. 15 However, pure CFO has exhibited poor stability, particularly under acidic conditions.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Piezoelectric Sensing of CFO@PDA/P(VDF-TrFE) Composite Films through Magnetic Field Orientation

Zhou

Chen

et al. 2022

ACS Appl. Mater. Interfaces

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Magnetic nanofiller is helpful for improving the piezoelectric properties of P(VDF-TrFE)-based composites, which shows promising potential as a flexible sensor or energy harvester. In this work, we use the interaction between the magnetic nanofiller and magnetic field to modify the structure of CoFe2O4 (CFO)@polydopamine (PDA)/P(VDF-TrFE) composite, in which CFO@PDA works as the nanofiller into the P(VDF-TrFE) matrix. It was found that the magnetic field orientation during polymer curing can significantly increase the content of the β-phase and d 33 of the composite. Regarding a typical composite film with 7 wt % CFO@PDA, the composite exhibits versatile sensing originated from the ball impact, hot-water droplet, bending, and pressing. In a noncontact magnetic field-driven experiment, the magnetic field oriented film produced the highest output voltages of 17.4 mV at 4 Hz and 12 mV at a drive amplitude of 19 Vpp, in contrast to the values of 7.1 mV and 7 mV for the film without magnetic field orientation, respectively. The LED without any charging capacitor can be instantaneously lighted through vertically pressing the oriented films. Thus, this work proposes a strategy of magnetic field orientation to improve the piezoelectric performance of the CFO@PDA/P(VDF-TrFE) multifunctional composite film.

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Section: Introductionmentioning

confidence: 99%

Enhancing the Piezoelectric Sensing of CFO@PDA/P(VDF-TrFE) Composite Films through Magnetic Field Orientation

Zhou

Chen

et al. 2022

ACS Appl. Mater. Interfaces

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“…The appearance of peaks (002) and (200) at around 2θ = 45° (inset of Fig. 2) indicates the tetragonal structure for all samples [25,30,31]. Further, a shift of peaks has been observed after doping, which may be either due to ionic size or valency effect.…”

Section: Resultsmentioning

confidence: 86%

Structural, dielectric and ferroelectric properties of Cu2+- and Cu2+/Bi3+-doped BCZT lead-free ceramics: a comparative study

Kumari

Kumar

et al. 2021

J Mater Sci: Mater Electron

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Perovskite typeBa0.98Ca0.02Zr0.02Ti0.98O3 (BCZT), Ba0.98Ca0.02Zr0.02Ti0.976Cu0.008O3 (BCZTC) and Ba0.9725Bi0.005Ca0.02Zr0.02Ti0.976Cu0.008O3(BCZTCB) lead-free ceramics were synthesised via solid-state reaction method at a sintering temperature of ~1380 °C. Effects of CuO and Bi2O3/CuO doping on structural, microstructural, dielectric, and ferroelectric properties were investigated systematically. X-ray diffraction technique confirmed the existence of pure perovskite phase with the tetragonal structure in pure and in the doped BCZT ceramics at room temperature. The dielectric analysis demonstrated two anomalies around 24 °C and 126 °C for BCZT, which were identified as orthorhombic to tetragonal (TO-T) and tetragonal to cubic (TC) phase transition temperature, respectively. The TO-T temperature shifted to below 16 °C, while the TC increased to 132 °C for the BCZTCB sample. The physical mechanisms of the conduction processes were investigated through impedance spectroscopy and the values of resistance, conductivity, and activation energies associated with the grain and grain boundaries were evaluated. The activation energy was determined to be higher for doped samples than for pure BCZT. Further, the dopant-dependent ferroelectric nature of the ceramic samples was evidenced by the analysis of characteristic hysteresis loop, and a value of remnant polarisation (Pr = 4.59 C/cm 2 ) was obtained for the BCZTCB ceramic sample. Furthermore, the d33 value, which was 54 pC/N for pure BCZT, was determined to be 140 pC/N and 64 pC/N for BCZTC and BCZTCB, respectively.

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“…From the measured piezoelectric voltage we determined both the amplitude and the phase relative to the applied magnetic eld. The magnetoelectric coupling, α ME , is calculated according to [2,5,7] where E is the electric eld in the P(VDF-TrFE) layer, V piezo is the measured piezoelectric voltage, t is the thickness of the P(VDF-TrFE) layer and H, H ac is the magnetic AC eld and magnetic eld amplitude, respectively, applied to the sample. The measured capacitance of the P(VDF-TrFE) layer, C = 970 pF, together with the ampli er input impedance, R = 100 MΩ, gives a piezoelectric cut-off frequency at 100 kHz of1/(2πRC)) ≈ 1.5 Hz.…”

Section: Experimental and Methodsmentioning

confidence: 99%

“…Previous studies on these or related materials show a maximum magnetoelectric coupling coe cient of 7 V/(cm⋅Oe) in the non-resonant mode and 370 V/(cm⋅Oe) in a resonant mode [4]. Other magnetoelectric coupling on composite structures has been performed earlier on different material combinations [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

High Magnetoelectric Coupling of Metglas and P(VDF-TrFE) Laminates

Staaf

Sawatdee

Rusu

et al. 2021

Preprint

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Magnetoelectric (magnetic/piezoelectric) heterostructures bring new functionalities to develop novel transducer devices such as (wireless) sensors or energy harvesters and thus have been attracting research interest in the last years. We have studied the magnetoelectric coupling between Metglas films (2826MB) and poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) in a laminate structure. The metallic Metglas film itself served as bottom electrode and as top electrode we used an electrically conductive polymer, poly(3,4-ethylene-dioxythiophene): poly(styrene sulfonate) (PEDOT:PSS). Besides a direct electrical wiring via a graphite ink, a novel contactless readout method is presented using a capacitive coupling between the PEDOT: PSS layer and an electrode not in contact with the PEDOT:PSS layer. From the experimental result we determined a magnetoelectric coupling of 1445 V/(cm×Oe) at the magnetoelastic resonance of the structure, which is among the highest reported values for laminate structures of a magnetostrictive and a piezoelectric polymer layer. With the noncontact readout method, a magnetoelectric coupling of about 950 V/(cm×Oe) could be achieved, which surpasses previously reported values for the case of direct sample contacting. 2D laser Doppler vibrometer measurements in combination with FE simulations were applied to reveal the complex vibration pattern resulting in the strong resonant response.

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Enhanced magnetoelectric coupling in Ti and Ce substituted lead free CFO-BCZT laminate composites

Cited by 46 publications

References 36 publications

Enhancing the Piezoelectric Sensing of CFO@PDA/P(VDF-TrFE) Composite Films through Magnetic Field Orientation

Enhancing the Piezoelectric Sensing of CFO@PDA/P(VDF-TrFE) Composite Films through Magnetic Field Orientation

Structural, dielectric and ferroelectric properties of Cu2+- and Cu2+/Bi3+-doped BCZT lead-free ceramics: a comparative study

High Magnetoelectric Coupling of Metglas and P(VDF-TrFE) Laminates

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