Phase stability of pre‐irradiated CeO 2 with swift heavy ions under high pressure up to 45 GPa

2021 ◽  
Author(s):  
Jianxiong Lan ◽  
Pengfei Zhai ◽  
Shuai Nan ◽  
Lijun Xu ◽  
Jingjing Niu ◽  
...  
Keyword(s):  
High Pressure ◽  
Phase Stability ◽  
Heavy Ions ◽  
Swift Heavy Ions

scholarly journals Raman spectroscopy of apatite irradiated with swift heavy ions with and without simultaneous exertion of high pressure

2008 ◽  
Vol 91 (1) ◽  
pp. 17-22 ◽  
Author(s):  
J. Liu ◽  
U.A. Glasmacher ◽  
M. Lang ◽  
C. Trautmann ◽  
K.-O. Voss ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
High Pressure ◽  
Heavy Ions ◽  
Swift Heavy Ions

Effect of annealing and swift heavy ions irradiation on vanadium oxide thin films

2021 ◽  
pp. 1-8
Author(s):  
Kapil Gupta ◽  
Sarvesh Kumar ◽  
Rahul Singhal
Keyword(s):  
Thin Films ◽  
Vanadium Oxide ◽  
Heavy Ions ◽  
Oxide Thin Films ◽  
Swift Heavy Ions ◽  
Vanadium Oxide Thin Films

scholarly journals Unravelling the secrets of the resistance of GaN to strongly ionising radiation

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Miguel C. Sequeira ◽  
Jean-Gabriel Mattei ◽  
Henrique Vazquez ◽  
Flyura Djurabekova ◽  
Kai Nordlund ◽  
...  
Keyword(s):  
Heavy Ions ◽  
Ionising Radiation ◽  
Atomistic Simulations ◽  
Extended Defects ◽  
Swift Heavy Ions ◽  
High Fluences ◽  
Radiation Resistant ◽  
Simulation And Experiment ◽  
Underlying Mechanisms ◽  
Radiation Hard

AbstractGaN is the most promising upgrade to the traditional Si-based radiation-hard technologies. However, the underlying mechanisms driving its resistance are unclear, especially for strongly ionising radiation. Here, we use swift heavy ions to show that a strong recrystallisation effect induced by the ions is the key mechanism behind the observed resistance. We use atomistic simulations to examine and predict the damage evolution. These show that the recrystallisation lowers the expected damage levels significantly and has strong implications when studying high fluences for which numerous overlaps occur. Moreover, the simulations reveal structures such as point and extended defects, density gradients and voids with excellent agreement between simulation and experiment. We expect that the developed modelling scheme will contribute to improving the design and test of future radiation-resistant GaN-based devices.

scholarly journals Phase Stability of Iron Nitride Fe4N at High Pressure—Pressure-Dependent Evolution of Phase Equilibria in the Fe–N System

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3963
Author(s):  
Marius Holger Wetzel ◽  
Tina Trixy Rabending ◽  
Martin Friák ◽  
Monika Všianská ◽  
Mojmír Šob ◽  
...  
Keyword(s):  
High Pressure ◽  
Phase Equilibria ◽  
Phase Stability ◽  
Polymorphic Transition ◽  
Ex Situ ◽  
Stable Phase ◽  
Iron Nitride ◽  
Phase System ◽  
Target Composition ◽  
Heat Treated

Although the general instability of the iron nitride γ′-Fe4N with respect to other phases at high pressure is well established, the actual type of phase transitions and equilibrium conditions of their occurrence are, as of yet, poorly investigated. In the present study, samples of γ′-Fe4N and mixtures of α Fe and γ′-Fe4N powders have been heat-treated at temperatures between 250 and 1000 °C and pressures between 2 and 8 GPa in a multi-anvil press, in order to investigate phase equilibria involving the γ′ phase. Samples heat-treated at high-pressure conditions, were quenched, subsequently decompressed, and then analysed ex situ. Microstructure analysis is used to derive implications on the phase transformations during the heat treatments. Further, it is confirmed that the Fe–N phases in the target composition range are quenchable. Thus, phase proportions and chemical composition of the phases, determined from ex situ X-ray diffraction data, allowed conclusions about the phase equilibria at high-pressure conditions. Further, evidence for the low-temperature eutectoid decomposition γ′→α+ε′ is presented for the first time. From the observed equilibria, a P–T projection of the univariant equilibria in the Fe-rich portion of the Fe–N system is derived, which features a quadruple point at 5 GPa and 375 °C, above which γ′-Fe4N is thermodynamically unstable. The experimental work is supplemented by ab initio calculations in order to discuss the relative phase stability and energy landscape in the Fe–N system, from the ground state to conditions accessible in the multi-anvil experiments. It is concluded that γ′-Fe4N, which is unstable with respect to other phases at 0 K (at any pressure), has to be entropically stabilised in order to occur as stable phase system. In view of the frequently reported metastable retention of the γ′ phase during room temperature compression experiments, energetic and kinetic aspects of the polymorphic transition γ′⇌ε′ are discussed.

Nanoprecipitation resulting from the decomposition of supersaturated solid solutions in the tracks of swift heavy ions

2004 ◽  
Vol 49 (10) ◽  
pp. 1308-1312
Author(s):  
D. N. Korolev ◽  
A. E. Volkov
Keyword(s):  
Solid Solutions ◽  
Heavy Ions ◽  
Swift Heavy Ions ◽  
Supersaturated Solid Solutions

Nonlinear effects in stopping of partially ionized swift heavy ions

1998 ◽  
Vol 415 (3) ◽  
pp. 687-692 ◽  
Author(s):  
G. Maynard ◽  
K. Katsonis ◽  
G. Zwicknagel ◽  
S. Mabong ◽  
M. Chabot ◽  
...  
Keyword(s):  
Heavy Ions ◽  
Nonlinear Effects ◽  
Swift Heavy Ions ◽  
Partially Ionized

Optical studies on II–VI semiconductor quantum dots: Particle size dependence of the high pressure phase stability

1996 ◽  
Vol 203 ◽  
pp. 217-224 ◽  
Author(s):  
John Schroeder ◽  
Lih-Wen Hwang ◽  
Markus R. Silvestri ◽  
Mierie Lee ◽  
Peter D. Persans
Keyword(s):  
Quantum Dots ◽  
Particle Size ◽  
High Pressure ◽  
Phase Stability ◽  
Size Dependence ◽  
Semiconductor Quantum Dots ◽  
High Pressure Phase ◽  
Optical Studies ◽  
Pressure Phase

Ab initioinvestigation of phase stability ofY2Ti2O7andY2Zr2O7under high pressure

2009 ◽  
Vol 80 (21) ◽  
Author(s):  
H. Y. Xiao ◽  
Fei Gao ◽  
W. J. Weber
Keyword(s):  
High Pressure ◽  
Phase Stability

Graphite irradiated by swift heavy ions under grazing incidence

2002 ◽  
Vol 193 (1-4) ◽  
pp. 259-264 ◽  
Author(s):  
J Liu ◽  
C Trautmann ◽  
C Müller ◽  
R Neumann
Keyword(s):  
Heavy Ions ◽  
Grazing Incidence ◽  
Swift Heavy Ions

Electronic thermal spike effects in intermixing of bilayers induced by swift heavy ions

2003 ◽  
Vol 209 ◽  
pp. 194-199 ◽  
Author(s):  
Z.G. Wang ◽  
C. Dufour ◽  
S. Euphrasie ◽  
M. Toulemonde
Keyword(s):  
Heavy Ions ◽  
Thermal Spike ◽  
Swift Heavy Ions
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