期刊文献+
共找到4篇文章
< 1 >
每页显示 20 50 100
Microstructures and Phase Transition Points of As-Cast Mg-Zn-Y System Alloys 被引量:2
1
作者 Feng Juanni Guo Xuefeng Xu Chunjie Zhang Zhongming 《Journal of Rare Earths》 SCIE EI CAS CSCD 2006年第1期120-120,共1页
As-east mierostruetures and their distribution of Mg-Zn-Y ternary alloy with high magnesium, low zinc and yttrium were examined using Nikon Epiphot optical microscopy (OM), RigakuD/max-3C X- ray diffraetion (XRD),... As-east mierostruetures and their distribution of Mg-Zn-Y ternary alloy with high magnesium, low zinc and yttrium were examined using Nikon Epiphot optical microscopy (OM), RigakuD/max-3C X- ray diffraetion (XRD), and JEOL JSM-6700F scanning electron microscopy (SEM) equipped with an energydispersive X-ray spectroscopy (EDS). In the as-east mierostructures, Yttrium and zinc tend to segregate at grain boundaries, 展开更多
关键词 as-cast microstructure Mg-Zn-Y alloy differential thermal analyzer phase transition point rare earths
下载PDF
Determining the structural phase transition point from the temperature of ^(40)Ca^+ Coulomb crystal
2
作者 陈婷 杜丽军 +5 位作者 宋红芳 刘培亮 黄垚 童昕 管桦 高克林 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第12期155-158,共4页
We observed the linear-to-zigzag structural phase transition of a ^40Ca^+ crystal in a homemade linear Paul trap. The values of the total temperature of the ion crystals during the phase transition are derived using ... We observed the linear-to-zigzag structural phase transition of a ^40Ca^+ crystal in a homemade linear Paul trap. The values of the total temperature of the ion crystals during the phase transition are derived using the molecular-dynamics(MD) simulation method. A series of simulations revealed that the ratio of the radial to axial secular frequencies has a dependence on the total temperature that obeys different functional forms for linear and zigzag structures, and the transition point occurs where these functions intersect; thus, the critical value of the ratio of secular frequencies that drives the structure phase transition can be derived. 展开更多
关键词 phase transition point ion crystal structure molecular-dynamics simulation
下载PDF
Study of Dielectric and Mechanical Spectra on Point Defects and Phase Transition in Ferroelectric Ceramics
3
作者 ZHU J S LI W +2 位作者 CHEN K LU X M WANG Y N 《四川大学学报(自然科学版)》 CAS CSCD 北大核心 2005年第S1期18-18,共1页
Ferroelectric materials have enormous potential applications in advanced techniques. However, there are still many problems in its practical application. Dielectric and mechanical (internal friction) measurements are ... Ferroelectric materials have enormous potential applications in advanced techniques. However, there are still many problems in its practical application. Dielectric and mechanical (internal friction) measurements are very sensitive to phase transitions, relaxation process of point defects, domain walls and their mobility, which have severe effect on ferroelectric properties. These make them become very good means to investigate substantial information on structural features and to explore the fundamental principles in ferroelectric materials and their applications. In this paper, the dielectric and internal friction measurement were used to investigate the behaviors for point defects and phase transition in ferroelectric ceramics such as Bi_ 4-x La_ x Ti_ 3 O_ 12 , Bi_ 4 Ti_ 3-y Nb_ y O_ 12 , SrBi_ 2 Ti_ 2 O_ 9 , PbZr_ x Ti_ 1-x O_ 3 ,_ PMN-PT. They were used to clarify the mechanism for some ferroelectric behaviors. 展开更多
关键词 Dielectric and mechanic spectra Ferroelectric ceramics Point defects and phase transition.
下载PDF
Locating the QCD critical end point through peaked baryon number susceptibilities along the freeze-out line 被引量:1
4
作者 李志镔 陈亦点 +1 位作者 李丹凝 黄梅 《Chinese Physics C》 SCIE CAS CSCD 2018年第1期32-37,共6页
We investigate the baryon number susceptibilities up to fourth order along different freeze-out lines in a holographic QCD model with a critical end point(CEP), and we propose that the peaked baryon number susceptib... We investigate the baryon number susceptibilities up to fourth order along different freeze-out lines in a holographic QCD model with a critical end point(CEP), and we propose that the peaked baryon number susceptibilities along the freeze-out line can be used as a clean signature to locate the CEP in the QCD phase diagram.On the temperature and baryon chemical potential plane, the cumulant ratio of the baryon number susceptibilities(up to fourth order) forms a ridge along the phase boundary, and develops a sword-shaped "mountain" standing upright around the CEP in a narrow and oblate region. The measurement of baryon number susceptibilities from heavy-ion collision experiments is along the freeze-out line. If the freeze-out line crosses the foot of the CEP mountain, then one can observe the peaked baryon number susceptibilities along the freeze-out line, and the kurtosis of the baryon number distributions has the highest magnitude. The data from the first phase of the beam energy scan program at the Relativistic Heavy Ion Collider indicates that there should be a peak of the kurtosis of the baryon number distribution at a collision energy of around 5 Ge V, which suggests that the freeze-out line crosses the foot of the CEP mountain and the summit of the CEP should be located nearby, around a collision energy of 3–7 GeV. 展开更多
关键词 QCD baryon number susceptibilities critical end point phase transition
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部