检索结果-南通市图书馆

high Nitrogen pressure Solution (HNPS) growth of GaN on 2 inch free standing GaN substrates

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2011年第1期54卷 42-46页

作者： M.BOKOWSKI I.GRZEGORY B.LUCZNIK T.SOCHACKI M.KRYKO G.KAMLER S.POROWSKI institute of high pressure physics PAS

Recent results of high Nitrogen pressure Solution (HNPS) growth of GaN crystals deposited on and separated from 2 inch,and smaller,GaN substrates grown by Hydride Vapor Phase Epitaxy (HVPE) have been presented. The influence of the c-plane bowing in the initial substrate on quality,rate and mode of growth by HNPS method has been analyzed in details.

关键词： high Nitrogen pressure Solution (HNPS) growth seeded growth Hydride Vapor Phase Epitaxy (HVPE) growth

Change in carbonate budget and composition during subduction below metal saturation boundary

在线全文

学校读者我要写书评

暂无评论

Geoscience Frontiers 2023年第1期14卷 79-100页

作者： Anton Shatskiy Anton V.Arefiev Konstantin D.Litasov Vernadsky institute of Geochemistry and Analytical Chemistry Russian Academy of SciencesMoscow 119991Russia vereshchagin institute for high pressure physics Russian Academy of SciencesTroitskMoscow 108840Russia

It is generally accepted that carbonates can be subducted to the mantle depths,where they are reduced with iron metal to produce a *** this work,we found that this is not always the *** mantle carbonates from inclusions in diamonds show a wide range of cation compositions(Mg,Fe,Ca,Na,and K).Here we studied the reaction kinetics of these carbonates with iron metal at 6-6.5 GPa and 1000-1500℃.We found that the reduction of carbonate with Fe produces C-bearing species(Fe,Fe-C melt,Fe_(3)C,F e_(7)C_(3),C)and wüistite containing Na_(2)O,CaO,and *** reaction rate constants(k=△x^(2)/2t)are log-linear relative to 1/T and their temperature dependences are determined to be k_(MgcO_(3))(m^(2)/s)=4.37×10^(-3)exp[-251(kJ/mol)/RT]k_(caMg(CO_(3))2)(m^(2)/s)=1.48×10^(-3)exp[-264(kJ/mol)/RT]k_(cacO_(3))(m^(2)/s)=3.06×10^(-5)exp[-245(kJ/mol)/RT]and k_(Na_(2)cO_(3))(m^(2)/s)=1.88×10^(-10)exp[-155(kJ/mol)/RT].According to obtained results at least,45-70 vol%of carbonates preserve during subduction down to the 660-km discontinuity if no melting *** slab stagnation and warming,subsequent carbonate melting,and infiltration into the mantle saturated with iron metal are accompanied by a reduction of carbonate melt with *** established sequence of reactivity of carbonates:FeCO_(3)≥MgCO_(3)>CaMg(CO_(3))2>CaCO_(3)>>Na_(2)CO_(3),where K_(2)CO_(3)does not react at all with iron metal,implies that during reduction carbonate melt with Fe evolves toward *** above conclusions are consistent with the findings of carbonates in inclusions in diamonds from the lower mantle and high concentrations of alkalis,particularly K,in mantle carbonatite melts entrapped by diamonds from kimberlites and placers worldwide.

关键词： Carbonate Reduction of carbonate with Fe Reaction kinetics Carbonatite melt high-pressure experiment Earth's mantle

Observation of acoustic hybrid topological phases induced by the p-d orbital interactions

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 132-139页

作者： Xiao Xiang Feng Gao Yu-Gui Peng Peng Wu Zong-Lin Li Xue-Feng Zhu School of physics and Innovation institute Huazhong University of Science and Technology

In spinless systems,growing attention has recently been attracted to synthetic gauge fields,which redefine the fundamental crystal symmetries by utilizing the projective algebraic ***,synthetic gauge fields have been commonly investigated in single orbital systems,and explorations on hybrid orbitals remain elusive in ***,we report the experimental observation of hybrid topological phases induced by hybrid synthetic gauge flux,which is formed by the interaction between p and d orbitals embedded in acoustic *** breaking the translation symmetries of Lxand/or Ly,we unambiguously demonstrate the first-order M?bius edge states and higher-order corner *** work establishes a platform for seeking exotic topological phases induced by hybrid-orbitals interactions and initializing the framework of hybrid-orbitalsrelated topological *** applications can be anticipated in scenarios such as high-quality sensing and robust wave trapping due to the stepwise energy distribution of the hybrid topological phase.

关键词： topological insulator synthetic gauge field projective symmetry corner states

A high-Spectral-Resolution Laser Raman System and Its Application in Shock–Compressed Benzene

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese physics Letters 2013年第3期30卷 26-28页

作者： ZHAO Bei-Jing LIU Fu-Sheng ZHANG Ning-Chao FENG Li-Peng WANG Wen-Peng ZHANG Ming-Jian institute of high temperature high pressure physics Southwest Jiaotong UniversityChengdu 610031

Raman measurements play an important role in examining the molecular changes associated with shock-induced structural and chemical changes in condensed *** combine a high spectra-resolution Raman system with a two-stage light gas gun to provide better quality data than the transient Raman system used *** measurements are presented for the shock compression of *** high spectral resolution data have provided an insight into molecular changes that could not be obtained from time-resolved methods.

关键词： materials. methods. shock

Genetic link between saline and carbonatitic mantle fluids:The system NaCl-CaCO_(3)-MgCO_(3)±H_(2)O±Fe^(0) at 6 GPa

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Geoscience Frontiers 2022年第6期13卷 59-74页

作者： Anton Shatskiy Ivan V.Podborodnikov Anton V.Arefiev Altyna Bekhtenova Konstantin D.Litasov Vernadsky institute of Geochemistry and Analytical Chemistry of the Russian Academy of Science Moscow 119991Russia vereshchagin institute for high pressure physics of the Russian Academy of Science TroitskMoscow108840Russia

Melt inclusions in kimberlitic minerals and diamonds indicate that chlorides are important constituents of mantle carbonatite ***,alkaline chlorides are important constituents of saline high-density fluids(HDFs)found in diamonds from kimberlites and placers around the *** compositional variations suggest that saline and carbonatitic HDFs could be genetically ***,the essence of this link remains unclear owing to the lack of data on phase relations in the chloridecarbonate systems under *** we studied subsolidus and melting phase relations in the system NaCl–CaCO_(3)–MgCO_(3)at 6 GPa and 1000–1600℃using a Kawai-type multianvil *** found that at 1000℃,subsolidus assemblage consists of halite,magnesite,and *** higher temperatures,the stabilization of dolomite splits the subsolidus area into two partial ternary fields:halite+magnesite+dolomite and halite+dolomite+*** minimum on the liquidus surface corresponds to the halite-dolomite-aragonite ternary eutectic,situated at 1100℃.The eutectic melt has Ca#89 and contains 30 wt.%Na Cl(26 mol%2NaCl).The system has two ternary peritectics:halite+dolomite=magnesite+liquid located near the ternary eutectic and magnesite+dolomite=Mg-dolomite+liquid situated between 1300 and 1400℃.Although under dry conditions incipient melting yields carbonatedominated melt,the addition of water facilitates the fusion of Na Cl and expands the liquid field to Na Cl-rich compositions with up to 70 wt.%Na *** obtained results favor the idea that hydrous saline melts/fluids(brines)found as inclusions in diamonds could be a lower temperature derivative of mantle carbonatite melts and disagree with the hypothesis on chloride melt generation owing to the chloridecarbonate liquid immiscibility since no such immiscibility was *** also studied the interaction of the NaCl–CaCO_(3)–MgCO_(3)system with iron metal and found that carbonate reduction produces Cbearing species(Fe^(0)

关键词： Chloride Carbonate Halite Melting T-X diagram Earth’s mantle

Shock Induced Emission from Sapphire in high-pressure Phase of Rh2O3 （Ⅱ） Structure

在线全文

学校读者我要写书评

暂无评论

Chinese physics Letters 2007年第8期24卷 2341-2344页

作者：张岱宇刘福生郝高宇孙峪怀 institute of high pressure physics Southwest Jiaotong University Chengdu 610031

A distinct optical emission from the Rh203 （Ⅱ） structural sapphire is observed under shock compression of 125, 132, and 143 GPa. The emission intensity continuously increases with the thickness of shocked sapphire. The colour temperature is determined to be about 4000 K, which is obviously smaller than the reported value of the alpha phase alumina at the pressures below 80 GPa. The present results suggest that the structural transformation will cause an obvious change of optical property in sapphire.

关键词： TEMPERATURE-MEASUREMENTS COMPRESSION ALUMINA MODEL POLYMORPHS RADIATION PYROMETRY CRYSTAL WINDOWS COPPER

Numerical analysis of LaBi at high temperature and pressure

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Rare Earths 2011年第3期29卷 271-276页

作者： Purvee Bhardwaj Sadhna Singh high pressure physics Lab Department of Physics Barkatullah University

In this paper we focused on the structural,elastic and thermodynamic properties of the B1 phase of LaBi by using the modified TBP model,including the role of *** successfully obtained the phase transition pressure and volume change at different *** addition,elastic constants and bulk modulus of B1 phase of LaBi at different temperatures were *** results were comparable with the previous ones at high temperatures and *** thermodynamical properties of the B1 phase of LaBi were also predicted.

关键词： rare earth pnictides high-pressure crystal structure mechanical properties phase transition

A fiber-array probe technique for measuring the viscosity of a substance under shock compression

在线全文

学校读者我要写书评

暂无评论

Chinese physics B 2013年第10期22卷 589-592页

作者：冯立鹏刘福生马小娟赵北京张宁超王文鹏郝斌斌 Laboratory of high Temperature and high pressure physics Southwest Jiaotong University

A fiber-array probe is designed to measure the damping behavior of a small perturbed shock wave in an opaque substance, by which the effective viscosity of substance under the condition of high temperature and high pressure can be constrained according to the flyer-impact technique. It shows that the measurement precision of the shock arrival time by using this technique is within 2 ns. To easily compare with the results given by electrical pin technique, the newly developed method is used to investigate the effective viscosity of aluminum （Al）. The shear viscosity coefficient of A1 is determined to be 1700 Pa.s at 71 GPa with a strain rate of 3.6× 10^6 s-1, which is in good agreement with the results of other methods. The advantage of the new technique over the electrical pin one is that it is applicable for studying the non-conductive substances.

关键词： shock wave viscosity coefficient fiber array high temperatures and high pressures

The C_ν for calculating the shock temperatures of water below 80 GPa

在线全文

学校读者我要写书评

暂无评论

Science China(physics,Mechanics & Astronomy) 2011年第8期54卷 1443-1446页

作者： PENG XiaoJuan LIU FuSheng Zhang ShiLai ZHANG MingJian JING FuQian institute of high Temperature and high pressure physics Southwest Jiaotong University Chengdu 610031 China

The shock temperatures of water under 35-50 GPa are firstly measured by the optical pyrometry technique. Cν is a constant below 51 GPa (Cν=7.07R), and increases with the temperature above 51 GPa (Cν=(5.76+3.84×10-4T)R). From our calculation, the dissociation has little effect on Cν. But the electron is essential to the Cν calculation.

关键词： shock temperature water Cν