Phase transition, interband electronic transitions and enhanced ferroelectric properties in Mn and Sm co-doped bismuth ferrite films

RSC Advances ◽  
2016 ◽  
Vol 6 (99) ◽  
pp. 96563-96572 ◽  
Author(s):  
Yalong Liu ◽  
Jie Wei ◽  
Yaxin Guo ◽  
Tiantian Yang ◽  
Zuo Xu
Keyword(s):  
Phase Transition ◽  
Bismuth Ferrite ◽  
Ferroelectric Properties ◽  
Electronic Transitions ◽  
Energy Splitting ◽  
Co Doping ◽  
Ferrite Films ◽  
Co Doped

Polycrystalline BSFM (Bi0.95Sm0.05Fe0.925Mn0.075O3) films with enhanced polarazation by Mn–Sm co-doping due to the phase transition and energy splitting.

scholarly journals Modulation of Ferroelectric and Optical Properties of La/Co-Doped KNbO3 Ceramics

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2273
Author(s):  
Xue Zhang ◽  
Ruijuan Qi ◽  
Shangwei Dong ◽  
Shuai Yang ◽  
Chengbin Jing ◽  
...  
Keyword(s):  
Ferroelectric Properties ◽  
Cubic Phase ◽  
Bandgap Engineering ◽  
La Doping ◽  
Co Doping ◽  
Extrinsic Defect ◽  
Potential Applications ◽  
Defect Levels ◽  
Microscopic Morphology ◽  
Co Doped

The phase transition, microscopic morphology and optical and ferroelectric properties are studied in a series of La- and Co-doped KNbO3-based ceramics. The results show that the doping induces the transformation from the orthorhombic to the cubic phase of KNbO3, significantly reduces the optical bandgap and simultaneously evidently improves the leakage, with a slight weakening of ferroelectric polarization. Further analysis reveals that (i) the Co doping is responsible for the obvious reduction of the bandgap, whereas it is reversed for the La doping; (ii) the slight deterioration of ferroelectricity is due to the doping-induced remarkable extrinsic defect levels and intrinsic oxygen vacancies; and (iii) the La doping can optimize the defect levels and inhibit the leakage. This investigation should both provide novel insight for exploring the bandgap engineering and ferroelectric properties of KNbO3, and suggest its potential applications, e.g., photovoltaic and multifunctional materials.

scholarly journals ENHANCED FERROELECTRICITY AND FERROMAGNETISM OF (Y, Ni) CO-DOPED BiFeO3 MATERIALS

2018 ◽  
Vol 56 (1A) ◽  
pp. 219
Author(s):  
Dao Viet Thang
Keyword(s):  
Ferroelectric Properties ◽  
Sol Gel ◽  
Rhombohedral Structure ◽  
Ferromagnetic Behavior ◽  
X Ray Diffraction ◽  
X Ray ◽  
Co Doping ◽  
Saturation Polarization ◽  
Perovskite Type ◽  
Co Doped

In this study, multiferroicMultiferroic Bi1-xYxFe0.975Ni0.025O3 (x = 0.00, 0.05, 0.10, and 0.15) called as (Y, Ni)                co-doped BiFeO3 materials were synthesized by a sol-gel method.  and characterized by X-ray diffraction diagrams and(XRD), energy-dispersive X-ray (EDX) and vibrating sample magnetization (VSM) measurements demonstrated. The result showed that Bi1-xYxFe0.975Ni0.025O3all investigated materials waspresent a single phase of the perovskite-type rhombohedral structure. Ferromagnetism and ferroelectricity of the Bi1-xYxFe0.975Ni0.025O3 materials have been investigated. Results showed that the co-doping by (Y, Ni) for (Bi, Fe)  have affected in enhancing by the (Y, Ni) co-doping, as a result the ferroelectric polarization and magnetization of BiFeO3. The magnetic characterization indicated that the ferromagnetic behavior wasthe initial BiFeO3 materialwere enhanced with increasing concentration of Y3+ for (Y, Ni) co-substituted of BiFeO3. Which could beion. It is attributed to the defferentdifference of the magnetic momentmoments of Ni2+ and Fe3+, and+ ions, as well as the Y3+-Fe3+,+ and Y3+-Ni2+ super-exchange interaction. Theinteractions. The characteristics of the investigated materials, such as remanent magnetization (Mr), saturation magnetization (Ms), remanent polarization (2Pr) and saturation polarization (2Ps) continuously increase upon increasing in the range of x from 0.00 to 0.15. When x = 0.15, the values of Mr and Ms are 0.078 and 0.794 emu/g, respectively. The values of 2Pr and 2Ps are 16.58 and 27.99 µC/cm2, respectively. Origin of ferromagnetic and ferroelectric properties of Bi1-xYxFe0.975Ni0.025O3 materials will be discussed in this paper.

Domain pattern and piezoelectric response across polymorphic phase transition in strained bismuth ferrite films

2010 ◽  
Vol 97 (24) ◽  
pp. 242906 ◽  
Author(s):  
H. Y. Kuo ◽  
Y. C. Shu ◽  
H. Z. Chen ◽  
C. J. Hsueh ◽  
C. H. Wang ◽  
...  
Keyword(s):  
Phase Transition ◽  
Bismuth Ferrite ◽  
Piezoelectric Response ◽  
Domain Pattern ◽  
Polymorphic Phase Transition ◽  
Ferrite Films

Designable Phase Transition Temperature of VO2 Co-Doped with Nb and W Elements for Smart Window Application

2019 ◽  
Vol 19 (11) ◽  
pp. 7185-7191
Author(s):  
Hee Jung Kim ◽  
Dong Kyu Roh ◽  
Jung Whan Yoo ◽  
Dae-Sung Kim
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Phase Transition Temperature ◽  
Solar Modulation ◽  
Smart Window ◽  
Smart Windows ◽  
Co Doping ◽  
Window Applications ◽  
Nb Dopant ◽  
Co Doped

Monoclinic vanadium dioxide (VO2 (M)) particles co-doped with niobium and tungsten, with potential application in smart windows, were synthesized by hydrolysis and subsequent thermal decomposition of vanadyl sulfate. All the doped VO2 particles exhibited a monoclinic crystalline phase and the critical phase transition temperature (Tc) of VO2 (M) was adjusted by Nb and W co-doping. The Tc of Nb-doped VO2 (M) decreased at a rate of approximately 10 °C/at% Nb dopant, and the transition temperature could also be accurately controlled to room temperature (about 27 °C) by co-doping with Nb and W. A film prepared using co-doped VO2 (M) particles showed a solar modulation ability of ~18% and a luminous transmittance of 40%, indicating that the co-doped VO2 (M) particles represent suitable candidates for smart window applications.

Structure and Dielectric Properties of Ce and Ca Co-Doped BaTiO3 Ceramics

2016 ◽  
Vol 680 ◽  
pp. 184-188 ◽  
Author(s):  
Da Yong Lu ◽  
Dan Dan Han ◽  
Qiao Li Liu ◽  
Yan Dong Wang ◽  
Xiu Yun Sun
Keyword(s):  
Phase Transition ◽  
Dielectric Properties ◽  
Single Phase ◽  
Ceramic Structure ◽  
Co Doping ◽  
Valence States ◽  
First Order Phase Transition ◽  
First Order Phase ◽  
Diffuse Phase ◽  
Co Doped

Structure and dielectric properties of 5 % Ce and Ca co-doped BaTiO3 ceramics were investigated. The site occupations and valence states were studied using XRD, Raman spectroscopy, SEM, EPR and dielectric measurements. The Ba/Ti ratio has dramatic effects on ceramic structure and properties. Two single-phase ceramics with Ba/Ti = 1 and 0.937 have tetragonal and cubic structure, showing diffuse phase transition and first-order phase transition behaviors, respectively. The former exhibit the site occupations of mixed Ca2+/Ce3+ at Ba sites and Ca2+/Ce4+ at Ti sites. Ce ions have priority over Ca2+ ions in entering Ti sites as Ce4+ when co-doping in BaTiO3, which will impede Ca2+ ions to be incorporated completely into Ti sites.

Enhanced photocatalytic activity of La3+ and Se4+ co-doped bismuth ferrite nanostructures

2017 ◽  
Vol 5 (22) ◽  
pp. 11143-11151 ◽  
Author(s):  
Syed Irfan ◽  
Liangliang Li ◽  
Awais Siddique Saleemi ◽  
Ce-Wen Nan
Keyword(s):  
Photocatalytic Activity ◽  
Industrial Waste ◽  
Bismuth Ferrite ◽  
Polluted Water ◽  
Co Doping ◽  
Co Doped

We investigated the effect of La3+ and Se4+ co-doping on the photocatalytic activity of BiFeO3 for efficient purification of polluted water from industrial waste.

Ferromagnetic, electric, and ferroelectric properties of samarium and cobalt co-doped bismuth ferrite nanoparticles

2020 ◽  
Vol 147 ◽  
pp. 109607 ◽  
Author(s):  
M.M. Rhaman ◽  
M.A. Matin ◽  
M.N. Hossain ◽  
M.N.I. Khan ◽  
M.A. Hakim ◽  
...  
Keyword(s):  
Bismuth Ferrite ◽  
Ferroelectric Properties ◽  
Ferrite Nanoparticles ◽  
Co Doped
Sign in / Sign up

Export Citation Format

Share Document