Anomalies of Physical Properties in?-Bi2O3 ? a Phase Transition Governed by the Electronic Mechanism?

1996 ◽  
Vol 105 (5-6) ◽  
pp. 1541-1546 ◽  
Author(s):  
V. G. Orlov ◽  
A. A. Bush ◽  
S. A. Ivanov ◽  
V. V. Zhurov
Keyword(s):  
Phase Transition ◽  
Physical Properties ◽  
Electronic Mechanism

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.

Synthesis and Properties of Biodegradable Liquid Crystalline Poly(ester-Urethane)s Based on Poly(L-Lactic Acid)

2013 ◽  
Vol 652-654 ◽  
pp. 459-462
Author(s):  
Ya Tong Guo ◽  
Zhu Zheng ◽  
Zhen Qi Hou ◽  
Jie Du
Keyword(s):  
Phase Transition ◽  
Thermal Stability ◽  
Lactic Acid ◽  
Physical Properties ◽  
Liquid Crystalline ◽  
Degradation Rate ◽  
Hydrolytic Degradation ◽  
Hexamethylene Diisocyanate ◽  
Solution Polymerization ◽  
Phase Transition Temperatures

A series of biodegradable segmented liquid crystalline poly(ester-urethane)s were prepared by solution polymerization of poly(L-lactic acid) (PLLA), mesogenic diol prepolymer poly(butylene terephthaloyldioxy dibenzoates) (MD), and hexamethylene diisocyanate (HDI). The MD content was varied from 0 to 40 mol% so that the effects of the mesogen content on the thermal and physical properties, and hydrolytic degradation were examined respectively. It was found that introducing mesogens units could increase the thermal stability and the elastic properties, while reduced the phase transition temperatures and the hydrolytic degradation rate.

Photo-induced guest-host interactions produce chiral conglomerates accompanying grain boundaries in a smectic phase

2021 ◽  
Author(s):  
Hideaki Sasaki ◽  
Koudai Abe ◽  
Masanobu Sagisaka ◽  
Atsushi Yoshizawa
Keyword(s):  
Phase Transition ◽  
Liquid Crystals ◽  
Physical Properties ◽  
Grain Boundaries ◽  
Smectic Phase ◽  
Host Interactions

Photo-induced isomerization of an azobenzene unit not only induces phase transition between two different phases but also brings marked changes of physical properties in solids and liquid crystals. We prepared...

scholarly journals Effect of Transition Metal Substitution on the Charge-Transfer Phase Transition and Ferromagnetism of Dithiooxalato-Bridged Hetero Metal Complexes, (n-C3H7)4N[FeII1−xMnIIxFeIII(dto)3]

Crystals ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 446 ◽  
Author(s):  
Masaya Enomoto ◽  
Hiromichi Ida ◽  
Atsushi Okazawa ◽  
Norimichi Kojima
Keyword(s):  
Phase Transition ◽  
Charge Transfer ◽  
Physical Properties ◽  
Mixed Valence ◽  
Ferromagnetic Phase ◽  
Ferromagnetic Transition ◽  
Transfer Phase ◽  
Spin Configuration ◽  
Ion Radius ◽  
The Difference

The dithiooxalato-bridged iron mixed-valence complex (n-C3H7)4N[FeIIFeIII(dto)3] (dto = dithiooxalato) undergoes a novel charge-transfer phase transition (CTPT) accompanied by electron transfer between adjacent FeII and FeIII sites. The CTPT influences the ferromagnetic transition temperature according to the change of spin configuration on the iron sites. To reveal the mechanism of the CTPT, we have synthesized the series of metal-substituted complexes (n-C3H7)4N[FeII1-xMnIIxFeIII(dto)3] (x = 0–1) and investigated their physical properties by means of magnetic susceptibility and dielectric constant measurements. With increasing MnII concentration, x, MnII-substituted complexes show the disappearance of CTPT above x = 0.04, while the ferromagnetic phase remains in the whole range of x. These results are quite different from the physical properties of the ZnII-substituted complex, (n-C3H7)4N[FeII1-xZnIIxFeIII(dto)3], which is attributed to the difference of ion radius as well as the spin states of MnII and ZnII.

Nanoscale Heterogeneity in Functional Materials

MRS Bulletin ◽  
2009 ◽  
Vol 34 (11) ◽  
pp. 822-831 ◽  
Author(s):  
Turab Lookman ◽  
Peter Littlewood
Keyword(s):  
Phase Transition ◽  
Shape Memory Alloys ◽  
Physical Properties ◽  
Shape Memory ◽  
Functional Materials ◽  
Single Domain ◽  
Elastic Interactions ◽  
Domain Structures ◽  
Parent State

AbstractThe physical properties that make “functional” materials worthy of their moniker frequently arise because of a phase transition that establishes a new kind of order as the material is cooled from a parent state. Such ordered states include ferroelectrics, ferromagnets, and structurally ordered martensites; because these states all break an orientational symmetry, and it is rare that one can produce the conditions for single domain crystallinity, the observed configuration is generally heterogeneous. However, the conditions under which domain structures form are highly constrained, especially by elastic interactions within a solid; consequently, the observed structures are far from fully random, even if disorder is present. Often the structure of the heterogeneity is important to the function, as in shape-memory alloys. Increasingly, we are surprised to discover new phases inside solids that are themselves a heterogeneous modulation of their parents.

Some peculiarities in the behaviour of physical properties of masd in the vicinity of a phase transition

1985 ◽  
Vol 64 (1) ◽  
pp. 45-46
Author(s):  
V. Magatayev ◽  
V. Glushkov ◽  
L. Shuvalov ◽  
V. I. Cieminski ◽  
H. Arndt ◽  
...  
Keyword(s):  
Phase Transition ◽  
Physical Properties

scholarly journals Optical and physical properties of wet-spun films of Na-hyaluronate. Evidence of a phase transition

1992 ◽  
Vol 63 (2) ◽  
pp. 323-326 ◽  
Author(s):  
M.R. Flowers ◽  
R.L. Marlow ◽  
S.A. Lee ◽  
N. Lavalle ◽  
A. Rupprecht
Keyword(s):  
Phase Transition ◽  
Physical Properties
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