Decrease of metal to semiconducting phase transition temperature with increase of particle size in nickel ferrite

2014 ◽  
Author(s):  
Vanidha Dessingou ◽  
Arunkumar Arumugam ◽  
Kannan Radhakrishnan
Keyword(s):  
Phase Transition ◽  
Particle Size ◽  
Transition Temperature ◽  
Phase Transition Temperature ◽  
Nickel Ferrite

STUDY THE POLYOL PROCESS OF PREPARING THE Ru DOPED FePt NANOPARTICLES

2009 ◽  
Vol 23 (17) ◽  
pp. 3561-3566
Author(s):  
CHIH-HAO LEE ◽  
JEN-HO HSU ◽  
HUI-CHIA SU ◽  
TZU WEN HUANG
Keyword(s):  
Phase Transition ◽  
Particle Size ◽  
Transition Temperature ◽  
Phase Transition Temperature ◽  
Shell Structure ◽  
Polyol Process ◽  
Fept Nanoparticles ◽  
Fept Alloy ◽  
Fept Nanoparticle ◽  
The One

The structure of Ru doped FePt nanoparticles using polyol process was studied. The particle size grown is around 5 nm, and a shell structure might be formed. By selecting the time and temperature of adding the Ru precursors into solution, three different processes to synthesize the FePtRu particles were studied resulting in different growing mechanics. The possible models during the reaction process are also discussed. The phase transition temperature for the as-grown FCC FePt nanoparticle to transform into L 10 FePt nanoparticle is about 823 K which is about the same as the one without doping Ru atoms. From the XAS study of each element, the possible scenario is that: although Ru atoms with the size close to the Pt , they do not totally replace the Pt sites in the FePt alloy. Instead, most of Ru formed a shell outside the FePt nanoparticles and Fe atoms are replaced.

Some Factors Affecting on Magnetic Characteristic Quantities and Tc Curie Phase Transition Temperature of the Ni Nanoparticles by the Classical Heisenberg Model

2018 ◽  
Vol 7 (3.19) ◽  
pp. 113
Author(s):  
Nguyen Trong Dung ◽  
Pham Khac Hung
Keyword(s):  
Phase Transition ◽  
Particle Size ◽  
Transition Temperature ◽  
Phase Transition Temperature ◽  
Heisenberg Model ◽  
Magnetic Characteristic ◽  
Ni Nanoparticles ◽  
Factors Affecting ◽  
Classical Heisenberg Model ◽  
Effect Of Particle Size

 This paper investigates the effect of particle size D = 4.51nm, 5.03nm, 5.42nm, 5.91nm, rate of heat 4.1012K/s, 4.1013K/s, 4.1014K/s on magnetic characteristic quantities: Magnetization M, specific heat Cv, energy E, magnetic susceptibility c and Tc Curie phase transition temperature by classical Heisenberg model. The results show when increasing D particle size then Tc Curie transition temperature increases and when increasing rate of heat then Tc decreasing. In addition, there is the influence of D size and heating rate on magnetic characteristic quantities.  

The structure of membranes and membrane proteins embedded in amorphous ice

1992 ◽  
Vol 50 (1) ◽  
pp. 432-433
Author(s):  
Uwe Lücken ◽  
Joachim Jäger
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Membrane Proteins ◽  
Phase Transition Temperature ◽  
Lipid Vesicles ◽  
Freezing Stress ◽  
Amorphous Ice ◽  
Different Temperatures ◽  
Band Pass ◽  
Lipid Polymorphism

TEM imaging of frozen-hydrated lipid vesicles has been done by several groups Thermotrophic and lyotrophic polymorphism has been reported. By using image processing, computer simulation and tilt experiments, we tried to learn about the influence of freezing-stress and defocus artifacts on the lipid polymorphism and fine structure of the bilayer profile. We show integrated membrane proteins do modulate the bilayer structure and the morphology of the vesicles.Phase transitions of DMPC vesicles were visualized after freezing under equilibrium conditions at different temperatures in a controlled-environment vitrification system. Below the main phase transition temperature of 24°C (Fig. 1), vesicles show a facetted appearance due to the quasicrystalline areas. A gradual increase in temperature leads to melting processes with different morphology in the bilayer profile. Far above the phase transition temperature the bilayer profile is still present. In the band-pass-filtered images (Fig. 2) no significant change in the width of the bilayer profile is visible.

scholarly journals Study of physical properties of a ferrimagnetic spinel Cu1.5Mn1.5O4: spin dynamics, magnetocaloric effect and critical behavior

RSC Advances ◽  
2021 ◽  
Vol 11 (41) ◽  
pp. 25664-25676
Author(s):  
Abir Hadded ◽  
Jalel Massoudi ◽  
Sirine Gharbi ◽  
Essebti Dhahri ◽  
A. Tozri ◽  
...  
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Physical Properties ◽  
Magnetocaloric Effect ◽  
Phase Transition Temperature ◽  
Magnetic Phase Transition ◽  
Critical Behavior ◽  
Magnetic Phase ◽  
Spin Dynamics ◽  
Critical Behaviour

The present work reports a detailed study of the spin dynamics, magnetocaloric effect and critical behaviour near the magnetic phase transition temperature, of a ferrimagnetic spinel Cu1.5Mn1.5O4.

scholarly journals Modulating the phase transition temperature of giant magnetocaloric thin films by ion irradiation

2017 ◽  
Vol 1 (6) ◽  
Author(s):  
S. Cervera ◽  
M. Trassinelli ◽  
M. Marangolo ◽  
C. Carrétéro ◽  
V. Garcia ◽  
...  
Keyword(s):  
Thin Films ◽  
Phase Transition ◽  
Transition Temperature ◽  
Phase Transition Temperature ◽  
Ion Irradiation
Sign in / Sign up

Export Citation Format

Share Document