Microstructure of high-performance thermochromic ZrO2/V0.984W0.016O2/ZrO2 coating with a low transition temperature (22 °C) prepared on flexible glass

2021 ◽  
Vol 424 ◽  
pp. 127654
Author(s):  
Jiechao C. Jiang ◽  
Tomáš Bárta ◽  
Jaroslav Vlček ◽  
Jiří Houška ◽  
Efstathios I. Meletis
Keyword(s):  
Transition Temperature ◽  
High Performance ◽  
Zro2 Coating

scholarly journals Alloying effect on the order–disorder transformation in tetragonal FeNi

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Li-Yun Tian ◽  
Oliver Gutfleisch ◽  
Olle Eriksson ◽  
Levente Vitos
Keyword(s):  
Transition Temperature ◽  
High Performance ◽  
Density Functional ◽  
Permanent Magnets ◽  
Positive Impact ◽  
Design Strategies ◽  
Alloying Effect ◽  
Functional Theory ◽  
Disorder Transition ◽  
Disorder Transition Temperature

AbstractTetragonal ($${\hbox{L1}}_{0}$$ L1 0 ) FeNi is a promising material for high-performance rare-earth-free permanent magnets. Pure tetragonal FeNi is very difficult to synthesize due to its low chemical order–disorder transition temperature ($$\approx {593}$$ ≈ 593  K), and thus one must consider alternative non-equilibrium processing routes and alloy design strategies that make the formation of tetragonal FeNi feasible. In this paper, we investigate by density functional theory as implemented in the exact muffin-tin orbitals method whether alloying FeNi with a suitable element can have a positive impact on the phase formation and ordering properties while largely maintaining its attractive intrinsic magnetic properties. We find that small amount of non-magnetic (Al and Ti) or magnetic (Cr and Co) elements increase the order–disorder transition temperature. Adding Mo to the Co-doped system further enhances the ordering temperature while the Curie temperature is decreased only by a few degrees. Our results show that alloying is a viable route to stabilizing the ordered tetragonal phase of FeNi.

scholarly journals High-performance thermochromic VO2-based coatings with a low transition temperature deposited on glass by a scalable technique

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
David Kolenatý ◽  
Jaroslav Vlček ◽  
Tomáš Bárta ◽  
Jiří Rezek ◽  
Jiří Houška ◽  
...  
Keyword(s):  
Transition Temperature ◽  
High Performance

scholarly journals Tailoring the phase transition temperature to achieve high-performance cubic GeTe-based thermoelectrics

2020 ◽  
Vol 8 (36) ◽  
pp. 18880-18890 ◽  
Author(s):  
Ady Suwardi ◽  
Jing Cao ◽  
Lei Hu ◽  
Fengxia Wei ◽  
Jing Wu ◽  
...  
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Phase Transition Temperature ◽  
High Performance ◽  
Cubic Phase

The rhombohedral–cubic phase transition temperature of GeTe can be tailored via Sn-alloying, leading to high performance thermoelectric GeTe.

scholarly journals Phase-transition temperature suppression to achieve cubic GeTe and high thermoelectric performance by Bi and Mn codoping

2018 ◽  
Vol 115 (21) ◽  
pp. 5332-5337 ◽  
Author(s):  
Zihang Liu ◽  
Jifeng Sun ◽  
Jun Mao ◽  
Hangtian Zhu ◽  
Wuyang Ren ◽  
...  
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Phase Transition Temperature ◽  
High Performance ◽  
Hole Concentration ◽  
Rhombohedral Structure ◽  
Germanium Telluride ◽  
Strong Point ◽  
Bi Doping ◽  
Valence Bands

Germanium telluride (GeTe)-based materials, which display intriguing functionalities, have been intensively studied from both fundamental and technological perspectives. As a thermoelectric material, though, the phase transition in GeTe from a rhombohedral structure to a cubic structure at ∼700 K is a major obstacle impeding applications for energy harvesting. In this work, we discovered that the phase-transition temperature can be suppressed to below 300 K by a simple Bi and Mn codoping, resulting in the high performance of cubic GeTe from 300 to 773 K. Bi doping on the Ge site was found to reduce the hole concentration and thus to enhance the thermoelectric properties. Mn alloying on the Ge site simultaneously increased the hole effective mass and the Seebeck coefficient through modification of the valence bands. With the Bi and Mn codoping, the lattice thermal conductivity was also largely reduced due to the strong point-defect scattering for phonons, resulting in a peak thermoelectric figure of merit (ZT) of ∼1.5 at 773 K and an average ZT of ∼1.1 from 300 to 773 K in cubic Ge0.81Mn0.15Bi0.04Te. Our results open the door for further studies of this exciting material for thermoelectric and other applications.

Synthesis and properties of random polysulfone/polyethersulfone copolymers as high-performance polymers

2011 ◽  
Vol 31 (4) ◽  
Author(s):  
Yi-Nan Zhang ◽  
Shu-Ling Zhang ◽  
Yan-Hua Yang ◽  
Hong-Yi Qin ◽  
Dong Jiang
Keyword(s):  
Thermal Stability ◽  
Weight Loss ◽  
Tensile Strength ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
High Performance ◽  
Excellent Thermal Stability ◽  
Elongation At Break ◽  
High Performance Polymers

Abstract A series of random polysulfone/polyethersulfone (PSF/PES) copolymers were synthesized by the polycondensation of 4,4′-isopropylidenediphenol, 4,4′-dihydroxyldiphenylsulfone, and 4,4′-dichlorodiphenylsulfone in the presence of potassium carbonate. The resulting copolymers displayed similar solubility with PSF and PES. The glass transition temperature and the 5% weight loss temperature of these copolymers varied in the range of 199°C–299°C and 467°C–498°C, respectively, which showed excellent thermal stability. Moreover, the elongation at break of these copolymers was much higher than that of PES, whereas the tensile strength was a little lower.

Preliminary adhesive and composite properties of LARC™-CPI 2, a new semicrystalline polyimide

1993 ◽  
Vol 5 (3) ◽  
pp. 177-185 ◽  
Author(s):  
P M Hergenrothert ◽  
S J Havens
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Glass Transition ◽  
Transition Temperature ◽  
High Performance ◽  
Melt Temperature ◽  
High Molecular Weight Form ◽  
Aerospace Applications ◽  
Composite Properties ◽  
Molecular Weight Form

In continuation of an effort to develop processable high-performance structural resins for use in aerospace applications, a new polyimide. LARCTM-CPI 2, has been developed. This semicrystalline polyimide was prepared by the reaction of 4.4'-oxydiphthalic anhydride with 1,4-bis(4-aminophenoxy-4'-benzoyl)benzene. In high-molecular-weight form this material has a glass transition temperature of 223 C and a crystalline melt temperature of approximately 350 'C. Controlled-molecular-weight end-capped versions of LARCTM-CPI 2 were used to fabricate adhesive panels and composites that exhibited good mechanical properties at temperatures as high as 200 C.

The Research of the Effect of Single-Walled Carbon Nanotubes on the Properties of Epichlorohydrin Rubber

2019 ◽  
Vol 945 ◽  
pp. 428-432
Author(s):  
E.N. Timofeeva ◽  
Natalia N. Petrova ◽  
K.N. Nikolaeva ◽  
E.S. Kuzmina
Keyword(s):  
Carbon Nanotubes ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Low Temperatures ◽  
High Performance ◽  
Single Walled Carbon Nanotubes ◽  
Elastomeric Materials ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

The development of frost-resistant elastomeric materials with high performance characteristics remains one of the topical issues. Solving this issue will significantly improve the reliability of machines and mechanisms operating under extremely low temperatures. The influence of multi-walled carbon nanotubes on the performance properties of epichlorohydrin rubber was investigated. This rubber of unique frost resistance has low glass transition temperature (Tg = -60 °C).

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