scholarly journals Electron beam-formed ferromagnetic defects on MoS2 surface along 1 T phase transition

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Sang Wook Han ◽  
Youngsin Park ◽  
Young Hun Hwang ◽  
Soyoung Jekal ◽  
Manil Kang ◽  
...  
Keyword(s):  
Phase Transition ◽  
Electron Beam ◽  
T Phase

Reversible H-T′ phase transition in monolayer molybdenum disulfide via electron beam assisted solid state lithiation/delithiation

2020 ◽  
Vol 116 (3) ◽  
pp. 033103
Author(s):  
Xujing Ji ◽  
Chunyang Wu ◽  
Jingfei Deng ◽  
Jixue Li ◽  
Chuanhong Jin
Keyword(s):  
Phase Transition ◽  
Electron Beam ◽  
Solid State ◽  
Molybdenum Disulfide ◽  
T Phase

Formation of Quasicrystals In Rapidly Solidified Al Alloys

1985 ◽  
Vol 58 ◽  
Author(s):  
Robert J. Schaefer ◽  
Leonid A Bendersky
Keyword(s):  
Electron Beam ◽  
Electron Beam Melting ◽  
Icosahedral Phase ◽  
Intermetallic Phases ◽  
Moderate Growth ◽  
Wide Range ◽  
Beam Surface ◽  
Equilibrium Phases ◽  
Rapidly Solidified ◽  
T Phase

ABSTRACTElectron beam surface melting has been used to study Al-Mn and Al-Mn-Si alloys subjected to a wide range of solidification conditions. Several of the reported equilibrium intermetallic phases are not found even at moderate growth rates. Beyond a composition-dependent critical velocity the equilibrium phases are all replaced by the quasicrystalline icosahedral and decagonal (T) phases. The icosahedral phase is favored over the T phase by higher solidification velocities. The addition of Si to Al-Mn alloys eliminates the T phase, but does not significantly facilitate the formation of the icosahedral phase by electron beam melting because the ternary α and β phases of Al-Mn-Si are able to grow rapidly into the electron beam melts.

Effect of Electron Beam Irradiation on the Rheological Properties and Phase Transition Temperature of Poly(N-Vinylcaprolactam)

2020 ◽  
Vol 865 ◽  
pp. 19-24
Author(s):  
Shane C. Halligan ◽  
Kieran A. Murray ◽  
Olivier Vrain ◽  
John G. Lyons ◽  
Luke M. Geever
Keyword(s):  
Phase Transition ◽  
Electron Beam ◽  
Rheological Properties ◽  
Smart Materials ◽  
Electron Beam Irradiation ◽  
Beam Irradiation ◽  
Beam Radiation ◽  
Rheological Analysis ◽  
Novel Approach ◽  
Potential Applications

Exposing smart materials to electron beam radiation can induce free radical reactions, such as chain branching or crosslinking, hence enhancing the characteristics of the polymers. Poly (N-vinylcaprolactam) (PNVCL) is a smart material which was synthesised by photopolymerisation. Subsequently, samples were exposed to electron beam technology, where electron beam irradiation was utilised in a novel approach. This led to the modification of the rheological and phase transition properties. Modifying PNVCL through electron beam irradiation opens new avenues and potential applications in the biomedical field. Physically cross-linked PNVCL polymers were prepared by photopolymerisation and samples were subsequently irradiated at different dose ranges (5kGy, 25kGy and 50 kGy). The rheological properties of the PNVCL based samples were established by rheological analysis. Similarly, the PNVCL based sample polymers were further characterised in solution to determine the phase transition of PNVCL.

scholarly journals The Phase Transition and Dehydration in Epsomite under High Temperature and High Pressure

Crystals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 75 ◽  
Author(s):  
Linfei Yang ◽  
Lidong Dai ◽  
Heping Li ◽  
Haiying Hu ◽  
Meiling Hong ◽  
...  
Keyword(s):  
Phase Transition ◽  
Electrical Conductivity ◽  
High Pressure ◽  
High Temperature ◽  
Magnesium Sulfate ◽  
Room Temperature ◽  
Diamond Anvil Cell ◽  
Vibrational Modes ◽  
Diamond Anvil ◽  
T Phase

The phase stability of epsomite under a high temperature and high pressure were explored through Raman spectroscopy and electrical conductivity measurements in a diamond anvil cell up to ~623 K and ~12.8 GPa. Our results verified that the epsomite underwent a pressure-induced phase transition at ~5.1 GPa and room temperature, which was well characterized by the change in the pressure dependence of Raman vibrational modes and electrical conductivity. The dehydration process of the epsomite under high pressure was monitored by the variation in the sulfate tetrahedra and hydroxyl modes. At a representative pressure point of ~1.3 GPa, it was found the epsomite (MgSO4·7H2O) started to dehydrate at ~343 K, by forming hexahydrite (MgSO4·6H2O), and then further transformed into magnesium sulfate trihydrate (MgSO4·3H2O) and anhydrous magnesium sulfate (MgSO4) at higher temperatures of 373 and 473 K, respectively. Furthermore, the established P-T phase diagram revealed a positive relationship between the dehydration temperature and the pressure for epsomite.

Electron-injection driven phase transition in two-dimensional transition metal dichalcogenides

2020 ◽  
Vol 8 (13) ◽  
pp. 4432-4440 ◽  
Author(s):  
Xiangyu Zhou ◽  
Haibo Shu ◽  
Qiuqi Li ◽  
Pei Liang ◽  
Dan Cao ◽  
...  
Keyword(s):  
Phase Transition ◽  
Transition Metal ◽  
Transition Metal Dichalcogenides ◽  
Electron Injection ◽  
Two Dimensional ◽  
Metal Dichalcogenides ◽  
T Phase

Electron injection leads to the transition of two-dimensional MoX2 (X = S, Se, and Te) nanosheets from the semiconducting H phase to semimetallic T′ phase.

Phase transition and piezoelectric properties of alkali niobate ceramics through composition tuning

RSC Advances ◽  
2015 ◽  
Vol 5 (76) ◽  
pp. 61989-61997 ◽  
Author(s):  
Yuanyu Wang ◽  
Nuoxin Xu ◽  
Qilong Zhang ◽  
Hui Yang
Keyword(s):  
Phase Transition ◽  
Phase Boundary ◽  
Piezoelectric Properties ◽  
Lead Free ◽  
T Phase

(1 − x)(K0.40Na0.60)(Nb0.95Sb0.05)O3–x(Bi0.5K0.5)HfO3 lead-free piezoceramics was designed. R–O–T phase boundary has been successfully achieved, which can remarkably enhance piezoelectric properties.

The Phase Transition of Potassium Sulfate

1992 ◽  
Vol 47 (10) ◽  
pp. 1039-1046 ◽  
Author(s):  
Wolfgang Kurtz
Keyword(s):  
Crystal Structure ◽  
Phase Transition ◽  
Strain Energy ◽  
Sufficient Accuracy ◽  
Potassium Sulfate ◽  
Clapeyron Equation ◽  
Longitudinal Acoustic ◽  
Discontinuous Phase ◽  
Semi Empirical ◽  
T Phase

AbstractThe discontinuous phase transition of K2SO4 is described by a semi-empirical model that uses the elastic stiffnesses ci,i and the changes in volume and entropy associated with the order-disorder transition. Consideration of the elastic anomaly (existence of soft, damped longitudinal acoustic phonons) in K2SO4 removes the disagreement between transition enthalpies ΔHtr measured calorimetrically and ΔHtr derived from the p-T phase diagram via the Clausius-Clapeyron equation. The model used requires the knowledge of the cu (i = 1, 2, 3) which in many cases is not available in the literature. It is demonstrated that these values can be calculated with sufficient accuracy from the anisotropic displacement (Debye-Waller) factors which are routinely determined in crystal structure analyses and which, therefore, are available for many substances. There is fair agreement between the calculated strain energy and ΔHtr also for K2SeO4 . In the case of K2CrO4 , use of published expansion data resulted in disagreement between calculated strain energy values and published, measured ΔHtr data.

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