The phase transition of ɛ-InxFe2−xO3 nanomagnets with a large thermal hysteresis loop (invited)

2012 ◽  
Vol 111 (7) ◽  
pp. 07B506 ◽  
Author(s):  
Kana Yamada ◽  
Hiroko Tokoro ◽  
Marie Yoshikiyo ◽  
Takenori Yorinaga ◽  
Asuka Namai ◽  
...  
Keyword(s):  
Phase Transition ◽  
Hysteresis Loop ◽  
Thermal Hysteresis ◽  
Thermal Hysteresis Loop

A Surprisingly Large Thermal Hysteresis Loop in a Reversible Phase Transition of RbxMn [Fe(CN)6](x+2)/3×zH2O.

ChemInform ◽  
2005 ◽  
Vol 36 (14) ◽  
pp. no-no
Author(s):  
Shin-ichi Ohkoshi ◽  
Tomoyuki Matsuda ◽  
Hiroko Tokoro ◽  
Kazuhito Hashimoto
Keyword(s):  
Phase Transition ◽  
Hysteresis Loop ◽  
Thermal Hysteresis ◽  
Reversible Phase Transition ◽  
Thermal Hysteresis Loop ◽  
Reversible Phase

Charge transfer phase transition with reversed thermal hysteresis loop in the mixed-valence Fe9[W(CN)8]6·xMeOH cluster

2014 ◽  
Vol 50 (26) ◽  
pp. 3484 ◽  
Author(s):  
Szymon Chorazy ◽  
Robert Podgajny ◽  
Wojciech Nogaś ◽  
Wojciech Nitek ◽  
Marcin Kozieł ◽  
...  
Keyword(s):  
Phase Transition ◽  
Charge Transfer ◽  
Hysteresis Loop ◽  
Thermal Hysteresis ◽  
Mixed Valence ◽  
Transfer Phase ◽  
Thermal Hysteresis Loop

A Surprisingly Large Thermal Hysteresis Loop in a Reversible Phase Transition of RbxMn[Fe(CN)6](x+2)/3·zH2O

2005 ◽  
Vol 17 (1) ◽  
pp. 81-84 ◽  
Author(s):  
Shin-ichi Ohkoshi ◽  
Tomoyuki Matsuda ◽  
Hiroko Tokoro ◽  
Kazuhito Hashimoto
Keyword(s):  
Phase Transition ◽  
Hysteresis Loop ◽  
Thermal Hysteresis ◽  
Reversible Phase Transition ◽  
Thermal Hysteresis Loop ◽  
Reversible Phase

A Large Thermal Hysteresis Loop Produced by a Charge-Transfer Phase Transition in a Rubidium Manganese Hexacyanoferrate

2004 ◽  
Vol 43 (17) ◽  
pp. 5231-5236 ◽  
Author(s):  
Hiroko Tokoro ◽  
Shin-ichi Ohkoshi ◽  
Tomoyuki Matsuda ◽  
Kazuhito Hashimoto
Keyword(s):  
Phase Transition ◽  
Charge Transfer ◽  
Hysteresis Loop ◽  
Thermal Hysteresis ◽  
Transfer Phase ◽  
Thermal Hysteresis Loop ◽  
A Charge

Magnetic, Spectral and Structural Aspects of Spin Transitions in Iron(II) Complexes of 2-(Pyrazol-3-yl)pyridine and 3-(Thiazol-2-yl)pyrazole

1999 ◽  
Vol 52 (2) ◽  
pp. 109 ◽  
Author(s):  
Lucia S. Harimanow ◽  
Kristian H. Sugiyarto ◽  
Donald C. Craig ◽  
Marcia L. Scudder ◽  
Harold A. Goodwin
Keyword(s):  
Hydrogen Bonding ◽  
Hysteresis Loop ◽  
Room Temperature ◽  
Thermal Hysteresis ◽  
Structural Data ◽  
Monoclinic Space Group ◽  
Space Group ◽  
Thermal Hysteresis Loop ◽  
Lower Temperature ◽  
Structural Aspects

Tris(ligand)iron(II) complexes of 2-(pyrazol-3-yl)pyridine (3ppH) and 3-(thiazol-2-yl)pyrazole (3tpH) undergo temperature-induced singlet (1A1) ⇔ quintet (5T2) transitions. The transition in [Fe(3ppH)3] [CF3SO3]2.2H2O is continuous and centred above room temperature while that in the anhydrous triflate salt is discontinuous and is centred below room temperature. The latter transition occurs via a thermal hysteresis loop of width 12 K, Tc↓ and Tc↑ being 229 and 241 K, respectively. The displacement of the transition to lower temperature in the anhydrous salt is believed to be associated with the loss of hydrogen bonding involving the uncoordinated pyrazole >NH group and solvate water. In [Fe(3tpH)2(3tp)] [ClO4].2H2O and [Fe(3tpH)2(3tp)] [BF4].2H2O (3tp is the deprotonated ligand) continuous transitions are observed, centred below room temperature. In these instances the displacement is consistent with the intrinsically weaker field of the bidentate system containing two five-membered heterocycles. Structural data were obtained for [Fe(3ppH)3][CF3SO3]2.2H2O, [Fe(3tpH)3] [BF4]2.1·5H2O and [Ni(3tpH)3] [BF4]2.2(3tpH). The average metal–nitrogen distances in the complexes are 1·97, 2·18 and 2·09 Å, severally. The large difference in the distances for the two iron complexes arises from the different ground states: a singlet for the 3ppH complex and a quintet for the 3tpH complex. In all three salts there is extensive hydrogen bonding involving the pyrazole >NH groups, the anions and the solvate molecules. [Fe(3ppH)3] [CF3SO3]2.2H2O: monoclinic, space group P21/c, a 12·33(1), b 24·44(1), c 12·55(1) Å, β 115·27(4)°, Z 4. [Fe(3tpH)3] [BF4]2.1·5H2O: monoclinic, space group C 2/c, a 41·56(2), b 16·418(3), c 18·154(7) Å, β 106·94(2)°, Z 8. [Ni(3tpH)3] [BF4]2.2(3tpH):P bcn, a 14·928(2), b 15·310 (3), c 17·882 (3) Å, Z 4.

Dynamical control of the spin transition inside the thermal hysteresis loop of a spin-crossover single crystal

2016 ◽  
Vol 486 ◽  
pp. 187-191 ◽  
Author(s):  
Kamel Boukheddaden ◽  
Mouhamadou Sy ◽  
Miguel Paez-Espejo ◽  
Ahmed Slimani ◽  
François Varret
Keyword(s):  
Single Crystal ◽  
Hysteresis Loop ◽  
Spin Crossover ◽  
Thermal Hysteresis ◽  
Spin Transition ◽  
Thermal Hysteresis Loop ◽  
Dynamical Control

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.

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