LOCAL MICROSTRUCTURE EVOLUTION OF BISMUTH SODIUM TITANATE-BASED LEAD-FREE PIEZOELECTRIC SYSTEMS ACROSS THE MORPHOTROPIC PHASE BOUNDARY REGION

2012 ◽  
Vol 02 (04) ◽  
pp. 1230012 ◽  
Author(s):  
YUN LIU ◽  
RAY L. WITHERS ◽  
JIAN WANG ◽  
LASSE NORÉN ◽  
ANDREW J. STUDER ◽  
...  
Keyword(s):  
Phase Boundary ◽  
Morphotropic Phase Boundary ◽  
Piezoelectric Effect ◽  
Piezoelectric Materials ◽  
Sodium Titanate ◽  
Boundary Region ◽  
Lead Free ◽  
In Situ Neutron Diffraction ◽  
Piezoelectric Performance

Morphotropic phase boundary (MPB) containing piezoelectric systems generally exhibit enhanced piezoelectric performance at compositions within, or close to, the MPB region. The mechanism/s underlying such enhancement, however, are still contentious due to complex micro/nanostructure and apparently inherent local structural variability associated with octahedral tilt disorder/platelet precipitates in such piezoelectric materials. This paper reviews some recent structural analysis results from Bi0.5Na0.5TiO3 (BNT) and other binary, lead-free, piezoelectric materials systems derived from it via electron diffraction and in situ neutron diffraction. The results suggest that intrinsically existing local microstructure (LMS) in BNT essentially continues across the MPB region. The LMS, originating from inherent octahedral tilt disorder, is strongly temperature-, electric field-, pressure- and chemical composition-dependent, and may help to explain a series of phenomena observed in BNT-based binary materials systems, including the enhanced piezoelectric effect in the region of the MPB.

scholarly journals Role of Extrinsic Contribution to Temperature Stability of Piezoelectricity for (K,Na)NbO3-(Bi,M)ZrO3 Ceramics with Morphotropic Phase Boundary

Energies ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1972
Author(s):  
Gyoung-Ja Lee ◽  
Min-Ku Lee
Keyword(s):  
Thermal Stability ◽  
Phase Boundary ◽  
Morphotropic Phase Boundary ◽  
Intensity Variation ◽  
Temperature Stability ◽  
Boundary Region ◽  
X Ray Diffraction ◽  
T Phase

Temperature stability of dielectric, ferroelectric, and piezoelectric properties were investigated in situ by choosing (K,Na)NbO3-(Bi,K)ZrO3 (KNN-BKZ), (K,Na)NbO3-(Bi,Na,K,Li)ZrO3 (KNN-BNKLZ), and (K,Na)NbO3-(Bi,Li)ZrO3-(KNN-BLZ) as representative ceramics with rhombohedral-orthorhombic-tetragonal (R-O-T), R-T, and enriched T phase boundaries, respectively. The KNN-BNKLZ ceramics, which have an R-T phase boundary, showed the highest piezoelectricity but the worst temperature stability. On the other hand, the KNN-BLZ ceramics, which have an enriched T-phase, were slightly worse in terms of piezoelectricity compared to the R-O-T or R-T phase boundary, but their thermal stability was the best. From analyses of an extrinsic contribution by a difference between the small signal d33 and εrPr and an intensity variation of the (002) and (200) X-ray diffraction peaks for the KNN-based ceramics, it was suggested that increasing the extrinsic contribution in the morphotropic phase boundary region improves the piezoelectricity but decreases the thermal stability.

Morphotropic Phase Boundary Study of the BNT-BKT Lead-Free Piezoelectric Ceramics

2008 ◽  
Vol 368-372 ◽  
pp. 1908-1910 ◽  
Author(s):  
Wei Zhao ◽  
He Ping Zhou ◽  
Yong Ke Yan ◽  
Dan Liu
Keyword(s):  
Phase Boundary ◽  
Morphotropic Phase Boundary ◽  
Composition Range ◽  
Piezoelectric Properties ◽  
Rhombohedral Phase ◽  
Sodium Titanate ◽  
Xrd Analysis ◽  
Lead Free ◽  
Bismuth Sodium Titanate ◽  
Potassium Titanate

A lead-free piezoelectric ceramic binary system based on bismuth sodium titanate (Bi0.5Na0.5)TiO3 (BNT)-bismuth potassium titanate (Bi0.5K0.5)TiO3 (BKT) was synthesized by conventional mixed-oxide technique. The XRD analysis showed that the rhombohedral-tetragonal morphotropic phase boundary (MPB) of the Bi0.5 (Na1-xKx)0.5 TiO3 system was in the composition range of x = 0.16 ~ 0.20. In addition, the piezoelectric properties of this system were also investigated. It was indicated that the piezoelectric properties are better with the compositions near the rhombohedral phase within the MPB than the compositions near the tetragonal phase.

scholarly journals WHAT CAN BE EXPECTED FROM LEAD-FREE PIEZOELECTRIC MATERIALS?

2010 ◽  
Vol 03 (01) ◽  
pp. 5-13 ◽  
Author(s):  
DRAGAN DAMJANOVIC ◽  
NAAMA KLEIN ◽  
JIN LI ◽  
VIKTOR POROKHONSKYY
Keyword(s):  
Domain Wall ◽  
Phase Boundary ◽  
Morphotropic Phase Boundary ◽  
Wall Motion ◽  
Electromechanical Coupling ◽  
Piezoelectric Properties ◽  
Piezoelectric Materials ◽  
Domain Wall Motion ◽  
Lead Free

The reasons for the lower piezoelectric properties in the most studied lead-free piezoelectrics, modified (K, Na)NbO 3 and ( Bi 0.5 Na 0.5) TiO 3, are discussed. Contributions from domain wall motion and properties at the morphotropic phase boundary are considered and are compared to those in PZT. Lead-free, non-piezoelectric solutions to electromechanical coupling are discussed.

Morphotropic Phase Boundary of Lead-Free Piezoelectric Ceramics from BNT- KN System

2008 ◽  
Vol 55-57 ◽  
pp. 225-228 ◽  
Author(s):  
N. Pisitpipathsin ◽  
W. Koontasing ◽  
Sukum Eitssayeam ◽  
Uraiwan Intatha ◽  
Gobwute Rujijanagul ◽  
...  
Keyword(s):  
Phase Boundary ◽  
Morphotropic Phase Boundary ◽  
Niobium Oxide ◽  
Perovskite Phase ◽  
Piezoelectric Materials ◽  
Research Work ◽  
Lead Free ◽  
Ceramic System ◽  
Dielectric Data ◽  
Ferroelectric Perovskite

In this research work, the investigation of the morphotropic phase boundary, physical properties and electrical properties of lead- free piezoelectric materials of bismuth sodium titanium oxide: (Bi0.5Na0.5)TiO3 (BNT) and potassium niobium oxide : KNbO3 (KN) in the ceramic system of (1-x)BNT- xKN where x= 0.00, 0.03, 0.05, 0.08, 0.10 and 0.15 by modified mixed oxide method was carried out. The BNT and KN powders were prepared separately using calcination technique with optimum calcination temperature for producing both BNT and KN powders of about 800°C. XRD results revealed that the BNT-KN ceramics with low KN content of x less than 0.05 contain ferroelectric perovskite phase with rhombohedral symmetries while the higher KN content ceramics have mixed symmetries between rhombohedral and orthorhombic. From the evidences including phases, microstructures and dielectric data of the BNT-KN ceramics, it may be assumed that the morphotropic phase boundary may be at around the composition of x = 0.05.

Enhanced electrical properties near the morphotropic phase boundary in lead-free Bi0.5Na0.34K0.11Li0.05Ti1-xNixO3-δ ceramics

2021 ◽  
pp. 109716
Author(s):  
Pamornnarumol Bhupaijit ◽  
Noppadon Nuntawong ◽  
Pinit Kidkhunthod ◽  
Supree Pinitsoontorn ◽  
Theerachai Bongkarn
Keyword(s):  
Electrical Properties ◽  
Phase Boundary ◽  
Morphotropic Phase Boundary ◽  
Lead Free

scholarly journals A Method for Quantitatively Separating the Piezoelectric Component from the as-received "Piezoelectric" Signal

2021 ◽  
Author(s):  
Chaojie Chen ◽  
Shilong Zhao ◽  
Caofeng Pan ◽  
Yunlong Zi ◽  
Fangcheng Wang ◽  
...  
Keyword(s):  
Vinylidene Fluoride ◽  
Piezoelectric Effect ◽  
Piezoelectric Materials ◽  
Contact Electrification ◽  
Poly Vinylidene Fluoride ◽  
Implantable Electronics ◽  
The Time Domain ◽  
Electric Signals ◽  
Piezoelectric Devices ◽  
Piezoelectric Performance

Abstract Polymer-based piezoelectric devices are promising for developing future wearable force sensors, nanogenerators, and implantable electronics etc. The electric signals generated by them are often assumed as solely coming from piezoelectric effect. However, triboelectric signals originated from contact electrification between the piezoelectric devices and the contacted objects can produce non-negligible interfacial electron transfer, which is often combined with the piezoelectric signal to give a triboelectric-piezoelectric hybrid output, leading to an exaggerated measured “piezoelectric” signal. Herein, a simple and effective method is proposed for quantitatively identifying and extracting the piezoelectric charge from the hybrid signal. The triboelectric and piezoelectric parts in the hybrid signal generated by a poly(vinylidene fluoride)-based device are clearly differentiated, and their force and charge characteristics in the time domain are identified. This work presents an effective method to elucidate the true piezoelectric performance in practical measurement, which is crucial for evaluating piezoelectric materials fairly and correctly.

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