Temperature-dependent Raman and ultraviolet photoelectron spectroscopy studies on phase transition behavior of VO2 films with M1 and M2 phases

2014 ◽  
Vol 115 (15) ◽  
pp. 153501 ◽  
Author(s):  
Kunio Okimura ◽  
Nurul Hanis Azhan ◽  
Tetsuya Hajiri ◽  
Shin-ichi Kimura ◽  
Mustapha Zaghrioui ◽  
...  
Keyword(s):  
Phase Transition ◽  
Photoelectron Spectroscopy ◽  
Ultraviolet Photoelectron Spectroscopy ◽  
Phase Transition Behavior ◽  
Temperature Dependent ◽  
Transition Behavior ◽  
Spectroscopy Studies

Micro-dynamics mechanism of the phase transition behavior of poly(N-isopropylacrylamide-co-2-hydroxyethyl methacrylate) hydrogels revealed by two-dimensional correlation spectroscopy

2017 ◽  
Vol 8 (5) ◽  
pp. 865-878 ◽  
Author(s):  
Gehong Su ◽  
Tao Zhou ◽  
Xifei Liu ◽  
Yanan Ma
Keyword(s):  
Phase Transition ◽  
Ftir Spectroscopy ◽  
Correlation Spectroscopy ◽  
Volume Phase Transition ◽  
Hydroxyethyl Methacrylate ◽  
Two Dimensional ◽  
Phase Transition Behavior ◽  
Temperature Dependent ◽  
Volume Phase ◽  
Transition Behavior

The micro-dynamics mechanism of the volume phase transition of PNIPAM-co-HEMA hydrogels was established using temperature-dependent FTIR spectroscopy, PCMW2D, and 2DCOS analysis.

scholarly journals Effect of Zn-Doping on the Phase Transition Behavior and Thermoelectric Transport Properties of Cu2Se

2020 ◽  
Vol 58 (7) ◽  
pp. 466-471
Author(s):  
Seung Hyun Jin ◽  
Young Soo Lim
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Transport Properties ◽  
Phase Transition Behavior ◽  
Temperature Dependent ◽  
Thermoelectric Transport ◽  
Zn Doping ◽  
Transition Behavior ◽  
Zn Content ◽  
Thermoelectric Transport Properties

We report on the phase transition behavior and thermoelectric transport properties of Zn-doped Cu2Se. Cu2Se is comprised of nontoxic, low-cost and abundant elements, and has been attracting attention because of its very high thermoelectric performance, ZT, at high temperatures. Many studies have reported enhanced ZT in impurity doped Cu2Se, however, little is known about the effect of dopants on the phase transition behavior of Cu2Se. In this study, we prepared (Cu1-xZn)2Se (x = 0 ~ 0.03) compounds by spark plasma sintering, and investigated the phase transition behavior in terms of the temperature-dependent thermoelectric transport properties. Undoped Cu2Se consists of monoclinic α-Cu2Se and berzelianite at room temperature. However, the crystal structure of (Cu1-xZnx)2Se compounds is changed into a single phase of α-Cu2Se with increasing Zn content. As the Zn content increased, electrical conductivity decreased and Seebeck coefficient increased due to the donor role of Zn. The phase transition temperatures of the compounds were characterized as a function of Zn content, based on the temperature-dependent electrical conductivities and Seebeck coefficients. The phase transition temperature was increased by increasing Zn content, and it was attributed to the disappearance of the berzelianite phase whose phase transition temperature is lower than that of α-Cu2Se. Detailed effects of Zn-doping on both the phase transition behavior and thermoelectric transport properties were discussed.

Temperature dependent structural studies and phase transition behavior of K2Th(PO4)2

2019 ◽  
Vol 783 ◽  
pp. 310-320 ◽  
Author(s):  
Samatha Bevara ◽  
B. Rajeswari ◽  
S.J. Patwe ◽  
P.S.R. Krishna ◽  
A.B. Shinde ◽  
...  
Keyword(s):  
Phase Transition ◽  
Structural Studies ◽  
Phase Transition Behavior ◽  
Temperature Dependent ◽  
Transition Behavior

Discotic liquid crystals of transition metal complexes 40: unique double-clearing behavior of a series of novel discotic metallomesogens based on bis(phthalocyaninato)europium(III) complexes

2009 ◽  
Vol 13 (01) ◽  
pp. 70-76 ◽  
Author(s):  
Hidetomo Mukai ◽  
Miho Yokokawa ◽  
Kazuaki Hatsusaka ◽  
Kazuchika Ohta
Keyword(s):  
Phase Transition ◽  
Central Metal ◽  
X Ray Diffraction ◽  
Phase Transition Behavior ◽  
Temperature Dependent ◽  
Transition Sequence ◽  
Transition Behavior ◽  
Sandwich Type ◽  
First Time ◽  
Eu Complexes

It has long been believed that the phase transition behavior and clearing points (c.p.s) of phthalocyanine-based metallomesogens scarcely change regardless of the kind of central metal. In this work, we have synthesized a series of novel sandwich-type, europium complexes, bis[2,3,9,10,16,17,23,24-octakis(3,4-dialkoxyphenoxy)phthalocyaninato]europium(III) (abbreviated as {[( C n O )2 PhO ]8 Pc } 2 Eu (n = 8-16) (2a–2i)). Their mesomorphic properties were investigated by polarization microscope, differential scanning calorimeter and temperature dependent X-ray diffraction techniques to make a comparison with the phase transition behavior and c.p.s of the previously reported lutetium homologs ({[( C n O )2 PhO ]8 Pc }2 Lu (n = 8-16) (1). Very interestingly, the c.p.s of {[( C n O )2 PhO ]8 Pc }2 Eu complexes (2) are higher by 35–61°C than those of {[( C n O )2 PhO ]8 Pc }2 Lu complexes (1) having the same chain length (n). Furthermore, these Eu complexes (2) exhibited unique double-clearing behavior, whereas the Lu complexes (1) did not. For instance, the Eu complex (2i: n = 16) exhibited the following phase transition sequence: crystalline phase (K) 49°C Colh 133°C [Formula: see text] 158°C [Formula: see text] 216°C I.L.; the I.L. very slowly transformed into a Coltet mesophase; on further heating, Coltet cleared into I.L. again at 240°C. On the other hand, the corresponding Lu complex (1i: n = 16) exhibited a phase transition sequence of K 50°C Colh 124°C [Formula: see text] 148°C Coltet 205°C I.L., and did not exhibit the doubleclearing behavior. Thus, it was revealed for the first time, in the phthalocyanine-based metallomesogens, that the central metal had a large influence on their c.p.s and their phase transition behavior.

scholarly journals Temperature-Dependent Structural Properties, Phase Transition Behavior, and Dynamic Properties of a Benzene Derivative in the Solid State

2019 ◽  
Vol 19 (4) ◽  
pp. 2155-2162
Author(s):  
Yating Zhou ◽  
Rhian Patterson ◽  
P. Andrew Williams ◽  
Benson M. Kariuki ◽  
Colan E. Hughes ◽  
...  
Keyword(s):  
Phase Transition ◽  
Solid State ◽  
Structural Properties ◽  
Dynamic Properties ◽  
Benzene Derivative ◽  
Phase Transition Behavior ◽  
Temperature Dependent ◽  
Transition Behavior
Sign in / Sign up

Export Citation Format

Share Document