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| 1 | Geochemical Features of Trace and Rare Earth Elements of Pumice in Middle Okinawa Trough and Its Indication of Magmatic Process显示文摘Pumice,the most widely distributed volcanic rock in Okinawa Trough,is loose and porous.Since its formation,it has definitely suffered from the denudation of the sea to different degrees.In order to truly reveal the geochemical features of pumice,we choose the method of mineral separation.Firstly,the phenocryst is separated from glass.Then the phenocryst is divided into light and heavy mineral compositions.By ICP-MS(inductively coupled plasma mass spectrometry) analytical technology,the contents of trace and rare earth elements in the whole pumice,the glass and the heavy and light mineral compositions are determined respectively.By researching the elemental geochemical features,the magma dynamic processes are found.It shows that the initial magma for the pumice in Okinawa Trough came from the depleted mantle,from which the N-MORB(normal type of mid-ocean ridge basalt) is formed,homologous with the local basalts.But they are formed in different periods of magma crystal fractionation.Featured with sufficient crystal fractionation for pumice,it is found that the earlier crystallizing minerals are olivine,plagioclase and pyroxene.The pumice magma,formed from the depleted mantle,was mixed with additional subduction-related materials(components),and contaminated with the mass from upper crust when it rose up into the crust.As the Okinawa Trough is a back-arc basin in its early back-arc spreading stage,its magmatism has a series of its own unique characteristics,different from not only the mid-ocean ridge expansion,but also the mature back-arc basin. | ZHAI Shikui GUO Kun ZONG Tong YU Zenghui WANG Shujie CAI Zongwei ZHANG Xia | 2017 | Journal of Ocean University of China2017，16，2： | 1 |
| 2 | Quantized anomalous Hall resistivity achieved in molecular beam epitaxy-grown MnBi_(2)Te_(4)thin films显示文摘The intrinsic magnetic topological insulator MnBi_(2)Te_(4)provides a feasible pathway to the high-temperature quantum anomalous Hall(QAH)effect as well as various novel topological quantum phases.Although quantized transport properties have been observed in exfoliated MnBi_(2)Te_(4)thin flakes,it remains a big challenge to achieve molecular beam epitaxy(MBE)-grown MnBi_(2)Te_(4)thin films even close to the quantized regime.In this work,we report the realization of quantized anomalous Hall resistivity in MBE-grown MnBi_(2)Te_(4)thin films with the chemical potential tuned by both controlled in situ oxygen exposure and top gating.We find that elongated post-annealing obviously elevates the temperature to achieve quantization of the Hall resistivity,but also increases the residual longitudinal resistivity,indicating a picture of high-quality QAH puddles weakly coupled by tunnel barriers.These results help to clarify the puzzles in previous experimental studies on MnBi_(2)Te_(4)and to find a way out of the big difficulty in obtaining MnBi_(2)Te_(4)samples showing quantized transport properties. | Yunhe Bai Yuanzhao Li Jianli Luan Ruixuan Liu Wenyu Song Yang Chen Peng-Fei Ji Qinghua Zhang Fanqi Meng Bingbing Tong Lin Li Yuying Jiang Zongwei Gao Lin Gu Jinsong Zhang Yayu Wang Qi-Kun Xue Ke He Yang Feng Xiao Feng | 2024 | National Science Review2024，11，2： | 0 |
| 3 | Lightweight Si_(3)N_(4)@SiO_(2) ceramic foam for thermal insulation and electromagnetic wave transparency显示文摘Increasing porosity is one of the most direct ways to improve the thermal insulation and dielectric properties of materials.Until now,many wet methods for preparing Si_(3)N_(4) ceramic foams usually face the problems of complex rheology,long period,and expensive cost,and the reported pore sizes of Si_(3)N_(4) ceramic foams are typically micron-grade,resulting in a lack of competitiveness in thermal insulation and wave-transparent applications.In this paper,the Si_(3)N_(4)@SiO_(2) ceramic foams were prepared using an efficient dry-method,which combined three processes of low temperature chemical vapor deposition(LTCVD),template,and isostatic pressing.The method has the advantages of simple operation and short preparation period,and can realize near-net size molding and mass production.In addition,the evolution mechanisms of honeycomb microstructure and composition of Si_(3)N_(4)@SiO_(2) ceramic foam during sintering were studied by chemical reaction thermodynamics.The as-prepared Si_(3)N_(4)@SiO_(2) ceramic foam possesses low density(0.377 g·cm^(-3)),high compressive strength(7.5 MPa),low thermal conductivity(0.0808 W·m^(-1)·K^(-1)),and excellent dielectric properties(ε<1.32,tanδ<0.009)in the frequency range of 8-18 GHz,and its maximum working temperature in air can reach up to 1100℃.It will be recommended to be applied in the interlayer of Si_(3)N_(4) ceramic radome to improve its thermal insulation and electromagnetic wave transparency performances. | Zongwei Tong Xiangjie Yan Yuexiang Wang Kexun Li Weihai Ma | 2024 | Nano Research2024，17，5： | 0 |
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