Advanced Synthesis on Lead‐Free KxNa(1−x)NbO3 Piezoceramics for Medical Imaging Applications

Garroni, Sebastiano; Senes, Nina; Iacomini, Antonio; Enzo, Stefano; Mulas, G.; Pardo, L.; Cuesta‐López, Santiago

doi:10.1002/pssa.201700896

Cited by 15 publications

(12 citation statements)

References 108 publications

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“…Nowadays, piezoceramics represent an undeniable class of functional materials that are largely exploited in a wide range of key technologies, including imaging probes for medical diagnostics, new generations of sonars and wireless admittance monitoring systems [ 1 ]. With exceptional electromechanical properties and mild processing conditions, highly dense PZT (lead, zirconate, titanate), with a general formula Pb(Zr x Ti 1−x )O 3 , is the most commonly used compound in the manufacturing of piezoceramics-based devices [ 2 , 3 , 4 ].…”

Section: Introductionmentioning

confidence: 99%

Processing Optimization and Toxicological Evaluation of “Lead-Free” Piezoceramics: A KNN-Based Case Study

et al. 2021

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Due to the ever-increasing limitations of the use of lead-based materials, the manufacturing of lead-free piezoceramics with competitive piezoelectric properties and established nontoxicity is considered a priority for the scientific and industrial community. In this work, a lead-free system based on sodium potassium niobate (KNN), opportunely modified with MgNb2O6 (MN), was prepared through a combination of a mechanochemical activation method and air sintering, and its toxicity was evaluated. The effect of the mechanical processing on the microstructure refinement of the processed powders was established by X-ray diffraction and the average crystallite size content of the Nb2O5 species was evaluated. The experimental evidence was rationalized using a phenomenological model which permitted us to obtain the amount of powder processed at each collision and to optimize the activation step of the pre-calcined reagents. This influenced the final density and piezoresponse of the as-sintered pellets, which showed optimal properties compared with other KNN systems. Their toxicological potential was evaluated through exposure experiments to the pulverized KNN-based pellets, employing two widely used human and environmental cellular models. The in vitro assays proved, under the selected conditions, the absence of cytotoxicity of KNN-bases systems here studied.

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Section: Introductionmentioning

confidence: 99%

Processing Optimization and Toxicological Evaluation of “Lead-Free” Piezoceramics: A KNN-Based Case Study

et al. 2021

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“…Since 2004, the K x Na 1-x NbO 3 perovskitetype material has been established to be a potential substitute for PZT due to its high piezoelectric coefficient d 33 (up to 300 pC/N [5]) leading to an important investigation of this phase [6,7]. The K x Na 1-x NbO 3 perovskite phase has been investigated in bulk [8], thin films [9], single crystals [10] and for photovoltaic applications [11], energy storage [12], luminescence properties [13], sensors [14] or medical imaging [15]. However, in the KNN system, many other phases of potential interest exist without being thoroughly investigated.…”

Section: Introductionmentioning

confidence: 99%

Tetragonal tungsten bronze phase thin films in the K–Na–Nb–O system: Pulsed laser deposition, structural and dielectric characterizations

Aspe

Demange

Waroquet

et al. 2020

Journal of Alloys and Compounds

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Pulsed laser deposition parameters have been determined to synthesize pure Tetragonal Tungsten Bronze (TTB) phase thin films in the (K , Na)-Nb-O system (KNN). In relation to the high volatility of alkaline elements, it was found that the target composition and the targetsubstrate distance are of first importance. The TTB phase was identified by X-ray and electron diffraction and the surface microstructure consisting mainly of nanorods supports the formation of hallmark of the TTB phase. Poly-oriented nanorods have been obtained on both C-plane sapphire and (111)Pt/TiO 2 /SiO 2 /(001)Si substrates whereas horizontal nanorods oriented along the (hk0) planes have been grown on (100) and (110) SrTiO 3. All the nanorods are parallel together when grown on (110) SrTiO 3 and they present two in-plane orientations rotated of 90° from each other on (100) SrTiO 3. Dielectric characteristics (dielectric permittivity ε r , and loss tangent tanδ) have been measured at low (1 kHz-1 MHz) and high (1 GHz-40 GHz) frequencies, on films deposited on Pt coated silicon and sapphire, respectively. A value of ε r = 200 at 1 kHz with tanδ = 0.015 were measured in a parallel plate capacitor configuration, whereas ε r = 130 and tanδ = 0.20 at 10 GHz were retrieved from transmission lines printed on the KNN TTB thin film grown on C-plane sapphire. Raman investigations of the TTB films were performed in the temperature range 77-873 K, confirming the TTB phase formation and the absence of structural transition. Piezoelectric Force Microscopy measurements evidenced a piezoelectric signal although no switching could be performed. However the dielectric measurements, complicated by high leakage currents when a DC voltage was applied, did not evidence any proof of ferroelectricity for the undoped KNN TTB films whereas results reported on other niobates (A,A') 0.6 Nb 10 O 30 (with A: K, Na and A': Sr, Ba, Ca) have shown Curie temperatures, lying between 156°C and 560°C, separating the paraelectric phase (space group: P4/mbm N°127) and the ferroelectric one (space group: P4bm N°100).

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“…They can measure both high pressure and low pressure. AAC Technologies [60] manufactures integrated micro-component solutions, which provide acoustic and nonacoustic components. The two types of piezoelectric ceramics solutions, piezo actuators and touch sensors, are used in cell phones for feedback through vibrations and are advantageous due to their low power consumption and quick response ability.…”

Section: Physical Mechanism and Application Of Piezoelectric Effectmentioning

confidence: 99%

Structural Design and Physical Mechanism of Axial and Radial Sandwich Resonators with Piezoelectric Ceramics: A Review

Wang

Jiang

Thomas

2021

Sensors

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Piezoelectric ceramics are inexpensive functional materials which are widely used in sonar detection, home appliances, meteorological detection, telemetry and environmental protection and other applications. Sensors fabricated from these materials are compact and have fast response characteristics. Their underlying functional methodology is based on the direct piezoelectric effect whereby very small mechanical vibration signals are converted into electrical signals. Piezoelectric resonators are based on the reverse piezoelectric effect and they are widely used for the control of precision instruments and precision machinery, microelectronic components, bioengineering devices and other in applications requiring components to provide precision control of the relevant functional mechanism. In this paper, the structural evolution and design mechanism of sandwich resonators based on piezoelectric materials are reviewed, and the advantages and disadvantages of different structures are compared and analyzed. The goal is to provide a comprehensive reference for the selection, application and promotion of piezoelectric resonators and for future structural innovation and mechanism research relevant to sandwich resonators.

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Advanced Synthesis on Lead‐Free K_xNa_(1−x)NbO₃ Piezoceramics for Medical Imaging Applications

Cited by 15 publications

References 108 publications

Processing Optimization and Toxicological Evaluation of “Lead-Free” Piezoceramics: A KNN-Based Case Study

Processing Optimization and Toxicological Evaluation of “Lead-Free” Piezoceramics: A KNN-Based Case Study

Tetragonal tungsten bronze phase thin films in the K–Na–Nb–O system: Pulsed laser deposition, structural and dielectric characterizations

Structural Design and Physical Mechanism of Axial and Radial Sandwich Resonators with Piezoelectric Ceramics: A Review

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