Temperature-Dependent Ferroelectric and Piezoelectric Response of Yb3+ and Tm3+ co-Doped Ba0.95Ca0.05Ti0.90Zr0.10O3 Lead-Free Ceramic

Abstract The electrical properties of piezoelectric ceramics are temperature-dependent, which affects their potential for applications in environments with temperature variation. In this work, a Yb3+ and Tm3+ co-doped Ba0.95Ca0.05Ti0.90Zr0.10O3 (BCTZ-YT) dense lead-free ceramic was prepared using a modified polymeric precursor route. The structural characteristics were investigated by X-ray diffraction, scanning electron microscopy, and Raman spectroscopy. The temperature-dependence of the ferroelectricity, piezoelectricity, and permittivity was studied in detail. On the basis of structural and electrical measurements at various temperatures, the mechanism of a lack of oxygen vacancies, small structural defects, and small defect dipoles was deduced. This study reveals that the ferroelectricity and piezoelectricity are temperature-dependent, whereas the capacitance is essentially unchanged with increasing temperature owing to the presence of a pure orthorhombic phase. The results of this study are expected to inform future research.

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Defect dipole-induced high piezoelectric response and low activation energy of amphoteric Yb3+ and Dy3+ co-doped 0.5BaTi0.8Zr0.2O3-0.5Ba0.7Ca0.3TiO3 lead-free ceramics

Ceramics International ◽

10.1016/j.ceramint.2019.12.271 ◽

2020 ◽

Vol 46 (8) ◽

pp. 10040-10047 ◽

Cited By ~ 1

Author(s):

Yongshang Tian ◽

Lijia Cao ◽

Yuena Zhang ◽

Yifang Jing ◽

Xiang Ji ◽

...

Keyword(s):

Activation Energy ◽

Lead Free ◽

Piezoelectric Response ◽

Defect Dipole ◽

Lead Free Ceramics ◽

Co Doped

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[001] Oriented BifeO 3-Based Lead-Free Ceramic with a Rapid Piezoelectric Response Under Low Poling Voltage

SSRN Electronic Journal ◽

10.2139/ssrn.3869214 ◽

2021 ◽

Author(s):

Yunjing Shi ◽

Xiaoyu Dong ◽

Fei Yan ◽

Kun Zhu ◽

Guanglong Ge ◽

...

Keyword(s):

Lead Free ◽

Piezoelectric Response ◽

Lead Free Ceramic ◽

Poling Voltage

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Phase diagram determination of large piezoelectric response in BHT-BCT ceramics

Functional Materials Letters ◽

10.1142/s179360471950070x ◽

2019 ◽

Vol 12 (05) ◽

pp. 1950070 ◽

Cited By ~ 2

Author(s):

Zhonghua Dai ◽

Dingyan Li ◽

Jinglong Xie ◽

Weiguo Liu ◽

Shaobo Ge ◽

...

Keyword(s):

Phase Diagram ◽

High Performance ◽

Piezoelectric Properties ◽

Piezoelectric Materials ◽

Electronic Devices ◽

Lead Free ◽

Piezoelectric Response ◽

Cubic Phases ◽

Co Doped

High-performance lead-free piezoelectric materials are environmentally friendly and in great demand for electronic devices. In this study, the phase diagram and properties of Hf, Ca co-doped BaTiO3 (BHT-BCT) were investigated. A triple-point morphotropic phase boundary separating the rhombohedral, tetragonal and cubic phases for the (1-[Formula: see text])Ba(Ti0.85Hf0.15)O3-[Formula: see text](Ba0.7Ca0.3)TiO3 system exited at [Formula: see text] High piezoelectric properties with piezoelectric coefficients [Formula: see text] (572pC/N) and Curie temperature [Formula: see text] (90∘C) of 0.55Ba(Ti0.85Hf0.15)O3-0.45(Ba0.7Ca0.3)TiO3 are achieved in the BaTiO3-based ceramics.

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Photoluminescence and Magnetic Properties of Undoped and (Mn, Co) co-doped ZnO Nanoparticles

Current Nanoscience ◽

10.2174/1573413715666191010162626 ◽

2020 ◽

Vol 16 (4) ◽

pp. 655-666

Author(s):

Mona Rekaby

Keyword(s):

Magnetic Properties ◽

Zno Nanoparticles ◽

Room Temperature ◽

Magnetic Measurements ◽

Structural Defects ◽

Ferromagnetic Behavior ◽

Secondary Phases ◽

Antiferromagnetic Ordering ◽

Doped Zno ◽

Co Doped

Objective: The influence of Manganese (Mn2+) and Cobalt (Co2+) ions doping on the optical and magnetic properties of ZnO nanoparticles was studied. Methods: Nanoparticle samples of type ZnO, Zn0.97Mn0.03O, Zn0.96Mn0.03Co0.01O, Zn0.95Mn0.03 Co0.02O, Zn0.93Mn0.03Co0.04O, and Zn0.91Mn0.03Co0.06O were synthesized using the wet chemical coprecipitation method. Results: X-ray powder diffraction (XRD) patterns revealed that the prepared samples exhibited a single phase of hexagonal wurtzite structure without any existence of secondary phases. Transmission electron microscope (TEM) images clarified that Co doping at high concentrations has the ability to alter the morphologies of the samples from spherical shaped nanoparticles (NPS) to nanorods (NRs) shaped particles. The different vibrational modes of the prepared samples were analyzed through Fourier transform infrared (FTIR) measurements. The optical characteristics and structural defects of the samples were studied through Photoluminescence (PL) spectroscopy. PL results clarified that Mn2+ and Co2+ doping quenched the recombination of electron-hole pairs and enhanced the number of point defects relative to the undoped ZnO sample. Magnetic measurements were carried out at room temperature using a vibrating sample magnetometer (VSM). (Mn, Co) co-doped ZnO samples exhibited a ferromagnetic behavior coupled with paramagnetic and weak diamagnetic contributions. Conclusion: Mn2+ and Co2+ doping enhanced the room temperature Ferromagnetic (RTFM) behavior of ZnO. In addition, the signature for antiferromagnetic ordering between the Co ions was revealed. Moreover, a strong correlation between the magnetic and optical behavior of the (Mn, Co) co-doped ZnO was analyzed.

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A novel relaxor (Bi,Na,Ba)(Ti,Zr)O 3 lead‐free ceramic with high energy storage performance

Journal of the American Ceramic Society ◽

10.1111/jace.17785 ◽

2021 ◽

Author(s):

Muhammad Kashif Bilal ◽

Jian Wang ◽

Rabia Bashir ◽

Huan Liu ◽

Sana Ullah Asif ◽

...

Keyword(s):

Energy Storage ◽

High Energy ◽

Lead Free ◽

Storage Performance ◽

Lead Free Ceramic ◽

High Energy Storage

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Large Piezoelectric Response and Ferroelectricity in Li and V/Nb/Ta Co-Doped w-AlN

ACS Applied Materials & Interfaces ◽

10.1021/acsami.0c19620 ◽

2020 ◽

Author(s):

Mohammad Noor-A-Alam ◽

Oskar Z. Olszewski ◽

Humberto Campanella ◽

Michael Nolan

Keyword(s):

Piezoelectric Response ◽

Co Doped

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A chiral switchable photovoltaic ferroelectric 1D perovskite

Science Advances ◽

10.1126/sciadv.aay4213 ◽

2020 ◽

Vol 6 (9) ◽

pp. eaay4213 ◽

Cited By ~ 6

Author(s):

Yang Hu ◽

Fred Florio ◽

Zhizhong Chen ◽

W. Adam Phelan ◽

Maxime A. Siegler ◽

...

Keyword(s):

Electric Fields ◽

Mirror Symmetry ◽

Degrees Of Freedom ◽

Electrical Measurements ◽

Temperature Dependent ◽

Paraelectric Phase Transition ◽

Strongly Coupled ◽

Yield Phenomena ◽

Hybrid Perovskite ◽

Low Dimensional

Spin and valley degrees of freedom in materials without inversion symmetry promise previously unknown device functionalities, such as spin-valleytronics. Control of material symmetry with electric fields (ferroelectricity), while breaking additional symmetries, including mirror symmetry, could yield phenomena where chirality, spin, valley, and crystal potential are strongly coupled. Here we report the synthesis of a halide perovskite semiconductor that is simultaneously photoferroelectricity switchable and chiral. Spectroscopic and structural analysis, and first-principles calculations, determine the material to be a previously unknown low-dimensional hybrid perovskite (R)-(−)-1-cyclohexylethylammonium/(S)-(+)-1 cyclohexylethylammonium) PbI3. Optical and electrical measurements characterize its semiconducting, ferroelectric, switchable pyroelectricity and switchable photoferroelectric properties. Temperature dependent structural, dielectric and transport measurements reveal a ferroelectric-paraelectric phase transition. Circular dichroism spectroscopy confirms its chirality. The development of a material with such a combination of these properties will facilitate the exploration of phenomena such as electric field and chiral enantiomer–dependent Rashba-Dresselhaus splitting and circular photogalvanic effects.

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Temperature dependent fracture toughness of KNN-based lead-free piezoelectric ceramics

Acta Materialia ◽

10.1016/j.actamat.2019.05.060 ◽

2019 ◽

Vol 174 ◽

pp. 369-378 ◽

Cited By ~ 6

Author(s):

Yingwei Li ◽

Yixuan Liu ◽

Paul-Erich Öchsner ◽

Daniel Isaia ◽

Yichi Zhang ◽

...

Keyword(s):

Fracture Toughness ◽

Piezoelectric Ceramics ◽

Lead Free ◽

Temperature Dependent

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Magnetic properties of undoped and Co-doped n-type β–FeSi2.5 single crystals

Journal of Materials Research ◽

10.1557/jmr.2002.0429 ◽

2002 ◽

Vol 17 (11) ◽

pp. 2960-2965 ◽

Cited By ~ 4

Author(s):

E. Arushanov ◽

L. Ivanenko ◽

D. Eckert ◽

G. Behr ◽

U. K. Rößler ◽

...

Keyword(s):

Activation Energy ◽

Magnetic Properties ◽

Magnetic Susceptibility ◽

External Field ◽

Single Crystals ◽

Spin Glasses ◽

Paramagnetic Centers ◽

Temperature Dependent ◽

Paramagnetic Curie Temperature ◽

Co Doped

Results of magnetization and magnetic susceptibility measurements on undoped and Co-doped FeSi2.5 single crystals are presented. The temperature dependence of the magnetic susceptibility of the Co-doped sample in the range of 5–300 K can be explained by temperature-dependent contributions due to paramagnetic centers and the carriers excited thermally in the extrinsic conductivity region. The values of the paramagnetic Curie temperature and activation energy of the donor levels were estimated. It is also shown that the magnetic susceptibility of Co-doped samples cooled in zero external field and in a field are different. This resembles the properties of spin-glasses and indicates the presence of coupling between magnetic centers.

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