Metastable monoclinic and orthorhombic phases and electric field induced irreversible phase transformation at room temperature in the lead-free classical ferroelectricBaTiO3

2015 ◽  
Vol 91 (10) ◽  
Author(s):  
Ajay Kumar Kalyani ◽  
Dipak Kumar Khatua ◽  
B. Loukya ◽  
Ranjan Datta ◽  
Andy N. Fitch ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Electric Field ◽  
Room Temperature ◽  
Lead Free ◽  
Irreversible Phase Transformation

scholarly journals Large room-temperature electrocaloric effect in lead-free BaHf Ti O3 ceramics under low electric field

2016 ◽  
Vol 115 ◽  
pp. 58-67 ◽  
Author(s):  
Junning Li ◽  
Dawei Zhang ◽  
Shiqiang Qin ◽  
Tangyuan Li ◽  
Ming Wu ◽  
...  
Keyword(s):  
Electric Field ◽  
Room Temperature ◽  
Lead Free ◽  
Electrocaloric Effect

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.

Large electrocaloric effect in lead-free Ba1-xCaxTi1-yZryO3 ceramics under strong electric field at room-temperature

2018 ◽  
Vol 44 (12) ◽  
pp. 13595-13601 ◽  
Author(s):  
Manel ben Abdessalem ◽  
Issa Kriaa ◽  
Abdelhedi Aydi ◽  
Najmeddine Abdelmoula
Keyword(s):  
Electric Field ◽  
Room Temperature ◽  
Strong Electric Field ◽  
Lead Free ◽  
Electrocaloric Effect

Electrocaloric properties of lead-free ferroelectric ceramic near room temperature

2021 ◽  
Vol 127 (6) ◽  
Author(s):  
Hend Kacem ◽  
Ah. Dhahri ◽  
Mohamed Amara Gdaiem ◽  
Z. Sassi ◽  
L. Seveyrat ◽  
...  
Keyword(s):  
Room Temperature ◽  
Ferroelectric Ceramic ◽  
Lead Free
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