scholarly journals A charge neutral iron(ii) complex with an above room temperature spin crossover (SCO) and hysteresis loop

2015 ◽  
Vol 3 (44) ◽  
pp. 11635-11644 ◽  
Author(s):  
Kuppusamy Senthil Kumar ◽  
Ivan Šalitroš ◽  
Benoît Heinrich ◽  
Olaf Fuhr ◽  
Mario Ruben
Keyword(s):  
Phase Transition ◽  
Hysteresis Loop ◽  
Room Temperature ◽  
Spin Crossover ◽  
A Charge

A luminescent charge neutral Fe(ii) complex [Fe(L1)2] with above room temperature hysteretic spin crossover (SCO) is reported; a phase transition is associated with SCO as inferred from thermal and SAXS studies.

Matrix-free synthesis of spin crossover micro-rods showing a large hysteresis loop centered at room temperature

2015 ◽  
Vol 51 (45) ◽  
pp. 9346-9349 ◽  
Author(s):  
Haonan Peng ◽  
Gábor Molnár ◽  
Lionel Salmon ◽  
Azzedine Bousseksou
Keyword(s):  
Hysteresis Loop ◽  
Room Temperature ◽  
Spin Crossover ◽  
The Novel ◽  
Large Hysteresis ◽  
Crossover Behavior ◽  
Matrix Free

Acicular micro-rods of the novel [Fe(Htrz)3](CF3SO3)2 complex exhibiting large hysteretic spin crossover behavior perfectly centered at room temperature.

Room-Temperature First-Order Phase Transition in a Charge-Disproportionated Molecular Conductor (MeEDO-TTF)2PF6

2008 ◽  
Vol 20 (24) ◽  
pp. 7551-7562 ◽  
Author(s):  
Xiangfeng Shao ◽  
Yoshiaki Nakano ◽  
Masafumi Sakata ◽  
Hideki Yamochi ◽  
Yukihiro Yoshida ◽  
...  
Keyword(s):  
Phase Transition ◽  
Order Phase Transition ◽  
Room Temperature ◽  
First Order ◽  
Molecular Conductor ◽  
First Order Phase Transition ◽  
A Charge ◽  
First Order Phase

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.

scholarly journals Intermolecular interactions and charge transfer in the 2:1 tetrathiafulvalene bromanil complex, (TTF)2-BA

2011 ◽  
Vol 67 (3) ◽  
pp. 244-249 ◽  
Author(s):  
Pilar García-Orduña ◽  
Slimane Dahaoui ◽  
Claude Lecomte
Keyword(s):  
Crystal Structure ◽  
Phase Transition ◽  
Charge Transfer ◽  
Room Temperature ◽  
Charge Transfer Complex ◽  
Structural Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Donor And Acceptor ◽  
A Charge

The crystal structure of the 2:1 charge-transfer complex of tetrathiafulvalene [2,2′-bis(1,3-dithiolylidene)] and bromanil (tetrabromo-1,4-benzoquinone) [(TTF)2-BA, (C6H4S4)2–C6Br4O2] has been determined by X-ray diffraction at room temperature, 100 and 25 K. No structural phase transition occurs in the temperature range studied. The crystal is made of TTF–BA–TTF sandwich trimers. A charge-transfer estimation between donor and acceptor (0.2 e) molecules is proposed in comparison to the molecular geometries of TTF–BA and TTF and BA isolated molecules. Displacement parameters of the molecules have been modeled with the TLS formalism.

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

Room temperature study of the optical switching of a spin crossover compound inside its thermal hysteresis loop

2010 ◽  
Vol 96 (4) ◽  
pp. 041907 ◽  
Author(s):  
G. Gallé ◽  
D. Deldicque ◽  
J. Degert ◽  
Th. Forestier ◽  
J.-F. Létard ◽  
...  
Keyword(s):  
Hysteresis Loop ◽  
Optical Switching ◽  
Room Temperature ◽  
Spin Crossover ◽  
Thermal Hysteresis ◽  
Temperature Study ◽  
Thermal Hysteresis Loop

Electron Microscope study of commensurate-incommensurate phase transition in BaZnGeO4

1990 ◽  
Vol 48 (4) ◽  
pp. 172-173
Author(s):  
Naoki Yamamoto ◽  
Makoto Kikuchi ◽  
Tooru Atake ◽  
Akihiro Hamano ◽  
Yasutoshi Saito
Keyword(s):  
Phase Transition ◽  
Electron Microscope Study ◽  
Room Temperature ◽  
Hexagonal Lattice ◽  
Ferroelectric Materials ◽  
Temperature Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Periodic Arrays ◽  
Modulation Wave Vector

BaZnGeO4 undergoes many phase transitions from I to V phase. The highest temperature phase I has a BaAl2O4 type structure with a hexagonal lattice. Recent X-ray diffraction study showed that the incommensurate (IC) lattice modulation appears along the c axis in the III and IV phases with a period of about 4c, and a commensurate (C) phase with a modulated period of 4c exists between the III and IV phases in the narrow temperature region (—58°C to —47°C on cooling), called the III' phase. The modulations in the IC phases are considered displacive type, but the detailed structures have not been studied. It is also not clear whether the modulation changes into periodic arrays of discommensurations (DC’s) near the III-III' and IV-V phase transition temperature as found in the ferroelectric materials such as Rb2ZnCl4.At room temperature (III phase) satellite reflections were seen around the fundamental reflections in a diffraction pattern (Fig.1) and they aligned along a certain direction deviated from the c* direction, which indicates that the modulation wave vector q tilts from the c* axis. The tilt angle is about 2 degree at room temperature and depends on temperature.

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