Enhanced antiferroelectricity and double hysteresis loop observed in lead-free (1−x)NaNbO3-xCaSnO3 ceramics

2019 ◽  
Vol 114 (12) ◽  
pp. 122901 ◽  
Author(s):  
Jiaming Ye ◽  
Genshui Wang ◽  
Xuefeng Chen ◽  
Fei Cao ◽  
Xianlin Dong
Keyword(s):  
Hysteresis Loop ◽  
Lead Free ◽  
Double Hysteresis Loop

Double hysteresis loop in Cu-doped K0.5Na0.5NbO3 lead-free piezoelectric ceramics

2007 ◽  
Vol 90 (23) ◽  
pp. 232903 ◽  
Author(s):  
Dunmin Lin ◽  
K. W. Kwok ◽  
H. L. W. Chan
Keyword(s):  
Hysteresis Loop ◽  
Piezoelectric Ceramics ◽  
Lead Free ◽  
Double Hysteresis Loop

scholarly journals Synthesis and characterization of lead-free ternary component BST–BCT–BZT ceramic capacitors

2014 ◽  
Vol 04 (02) ◽  
pp. 1450014 ◽  
Author(s):  
Venkata Sreenivas Puli ◽  
Dhiren K. Pradhan ◽  
Brian C. Riggs ◽  
Shiva Adireddy ◽  
Ram S. Katiyar ◽  
...  
Keyword(s):  
Phase Transition ◽  
Dielectric Constant ◽  
Energy Density ◽  
Electric Field ◽  
Hysteresis Loop ◽  
Electric Fields ◽  
Room Temperature ◽  
Thermal Hysteresis ◽  
Lead Free ◽  
Maximum Electric Field

Polycrystalline sample of lead-free 1/3( Ba 0.70 Sr 0.30 TiO 3) + 1/3( Ba 0.70 Ca 0.30 TiO 3) + 1/3( BaZr 0.20 Ti 0.80 O 3)( BST - BCT - BZT ) ceramic was synthesized by solid state reaction method. Phase purity and crystal structure of as-synthesized materials was confirmed by X-ray diffraction (XRD). Temperature-dependent dielectric permittivity studies demonstrated frequency-independent behavior, indicating that the studied sample has typical diffuse phase transition behavior with partial thermal hysteresis. A ferroelectric phase transition between cubic and tetragonal phase was noticed near room temperature (~ 330 K). Bulk P–E hysteresis loop showed a saturation polarization of 20.4 μC/cm2 and a coercive field of ~ 12.78 kV/cm at a maximum electric field of ~ 115 kV/cm. High dielectric constant (ε ~ 5773), low dielectric loss (tan δ ~ 0.03) were recorded at room temperature. Discharge energy density of 0.44 J/cm3 and charge energy density of 1.40 J/cm3 were calculated from nonlinear ferroelectric hysteresis loop at maximum electric field. Dielectric constant at variable temperatures and electric fields, ferroelectric to paraelectric phase transition and energy storage properties were thoroughly discussed.

Fabrication Of La0.7Sr0.3MnO3/La0.5Sr0.5CoO3/La0.7Sr0.3MnO3 Heterostructures for Spin Valve Applications

1997 ◽  
Vol 494 ◽  
Author(s):  
M. C. Robson ◽  
S. B. Ogale ◽  
R. Godfrey ◽  
T. Venkatesan ◽  
M. Johnson ◽  
...  
Keyword(s):  
Hysteresis Loop ◽  
Spin Valve ◽  
Ferromagnetic Material ◽  
Perovskite Oxide ◽  
Structural Quality ◽  
X Ray Diffraction ◽  
Metallic Oxide ◽  
Ferromagnetic Layers ◽  
Double Hysteresis Loop

ABSTRACTEpitaxial growth of oxide heterostructures, which may be utilized in spin valve applications, has been demonstrated. The heterostructures consist of two ferromagnetic layers separated by a nonmagnetic metallic interlayer. The ferromagnetic material used is the manganese perovskite oxide, La0.7Sr0.3MnO3, while the metallic oxide interlayer is La0.5Sr0.5CoO3. X-ray diffraction spectra demonstrate the high structural quality of the heterostructures. The magnetization of the heterostructure as a function of magnetic field measured at room temperature yields a double hysteresis loop that is characteristic of this type of spin valve structure. The behavior of this double hysteresis loop is also examined as a function of the metallic interlayer thickness.

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