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Identification of vibrational mode symmetry and phonon anharmonicity in SbCrSe_(3)single crystal using Raman spectroscopy

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Science China Materials 2021年第11期64卷 2824-2834页

作者： Hong Wu Xiangnan Gong Yi Peng Long Zhang Bin Zhang Kunling Peng Jie Liu Guang Han Aifeng Wang Yisheng Chai Mingquan He Haoshuang Gu Emmanuel Guilmeau Guoyu Wang Xu Lu Xiaoyuan Zhou College of Physics and Institute of Advanced Interdisciplinary Studies Chongqing UniversityChongqing 401331China Chongqing Institute of Green and Intelligent Technology Chinese Academy of SciencesChongqing 400714China Analytical and Testing Center of Chongqing University Chongqing 401331China Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials Hubei Key Laboratory of Ferro&Piezoelectric Materials and DevicesFaculty of Physics&Electronic SciencesHubei UniversityWuhan 430062China College of Materials Science and Engineering Chongqing UniversityChongqing 400044China Laboratoire CRISMAT UMR-CNRSNormandie UniversityCaen 14050France

Developing an understanding of the physics underlying vibrational phonon modes,which are strongly related to thermal transport,has attracted significant research ***,we report the successful synthesis of bulk SbCrSe_(3)single crystal and its thermal transport property over the temperature range from 2 to 300 *** angle-resolved polarized Raman spectroscopy(ARPRS)and group theory calculation,the vibrational symmetry of each observed Raman mode in the cleaved(001)crystal plane of SbCrSe_(3)is identified for the first time,and then further verified through firstprinciples *** ARPRS results of some Raman modes(e.g.,Ag2~64 cm-1 and Ag 7~185 cm-1)can be adopted to determine the crystalline *** importantly,the temperature dependence of the lattice thermal conductivity(κL)is revealed to be more accurately depicted by the three-phonon scattering processes throughout the measured temperature range,substantiated by in-situ Raman spectroscopy analysis and the model-predictedκ*** results reveal the fundamental physics of thermal transport for SbCrSe_(3)from a completely new perspective and should thus ignite research interest in the thermal properties of other lowdimensional materials using the same strategy.

关键词： SbCrSe3 single crystal in-situ Raman angle-resolved polarized Raman spectroscopy lattice dynamics thermal transport

Super deformability and thermoelectricity of bulkγ-InSe single crystals

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Chinese Physics B 2021年第7期30卷 570-577页

作者： Bin Zhang Hong Wu Kunling Peng Xingchen Shen Xiangnan Gong Sikang Zheng Xu Lu Guoyu Wang Xiaoyuan Zhou 无 Analytical and Testing Center of Chongqing University Chongqing 401331China Chongqing Key Laboratory of Soft Condensed Matter Physics and Smart Materials College of PhysicsChongqing UniversityChongqing 401331China Chongqing Institute of Green and Intelligent Technology Chinese Academy of SciencesChongqing 400714China University of Chinese Academy of Sciences Beijing 100044China

Indium selenide,aⅢ–Ⅴgroup semiconductor with layered structure,attracts intense attention in various photoelectric applications,due to its outstanding ***,we report super deformability and thermoelectricity ofγ-In Se single crystals grown by modified Bridgeman *** crystal structure of In Se is studied systematically by transmission electron microscopy methods combined with x-ray diffraction and Raman *** predominate phase ofγ-In Se with dense stacking faults and local multiphases is directly demonstrated at atomic *** bulkγ-In Se crystals demonstrate surprisingly high intrinsic super deformative ability which is highly pliable with bending strains exceeding12.5%and 264%extension by *** the meantime,In Se also possesses graphite-like features which is printable,writable,and ***,the thermoelectric properties ofγ-In Se bulk single crystals are preliminary studied and thermal conductivity can be further reduced via bending-induced *** findings will enrich the knowledge of structural and mechanical properties'flexibility of In Se and shed lights on the intrinsic and unique mechanical properties of In Se polytypes.

关键词： γ-InSe single crystals structure identification super deformability thermoelectric properties

2016—2017年邵阳市中小学生生长发育与营养状况

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职业与健康 2017年第22期33卷 3126-3129,3133页

作者：伍桃英欧阳林周晓洁吴菲菲赵良忠蒋华彭坤罗泽睿李一青谢乐李海涛邵阳学院食品与化学工程学院湖南邵阳422000 湖南省果蔬清洁加工工程技术研究中心湖南邵阳422000 豆制品加工技术湖南省应用基础研究基地湖南邵阳422000 邵阳学院附属医院普外科湖南邵阳422000

目的了解邵阳市中小学生生长发育和营养状况,为制订学生营养改善与干预政策提供依据。方法采用分层整群随机抽样法,于2016—2017年在邵阳市抽取了2 126名中小学生进行身高、体重测量,计算体质指数(BMI),结合"学龄儿童青少年营养不良筛查... 详细信息

目的了解邵阳市中小学生生长发育和营养状况,为制订学生营养改善与干预政策提供依据。方法采用分层整群随机抽样法,于2016—2017年在邵阳市抽取了2 126名中小学生进行身高、体重测量,计算体质指数(BMI),结合"学龄儿童青少年营养不良筛查"标准和"中国儿童营养状况的BMI标准"进行营养评价。结果邵阳市6~15岁中小学生男生的平均身高和体重均大于同年龄段的女生,但均低于全国平均水平;男生、女生生长迟缓检出率分别为2.85%、3.43%;该市中小学生BMI等级评价,其中消瘦、正常、超重和肥胖的比例分别为5.29%、86.78%、5.24%、2.69%,全血中钙、铁、锌缺乏的比例分别为8.31%、9.57%、4.26%。结论邵阳市中小学生生长迟缓检出率较高,营养不良和超重肥胖同时存在,钙铁锌的缺乏率较高,应关注中小学生的营养与健康,加强营养健康教育和干预,改善邵阳市中小学生的营养状况、促进人体健康生长。

关键词：中小学生生长发育营养状况

Synthesis and thermoelectric properties of Nd-single filled p-type skutterudites

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Chinese Physics B 2018年第4期27卷 80-84页

作者： Hong Wu Nusrat Shaheen Heng-Quan Yang Kun-Ling Peng Xing-Chen Shen Guo-Yu Wang Xu Lu Xiao-Yuan Zhou Department of Applied Physics Chongqing University Chongqing 400044 China Chongqing Institute of Green and Intelligent Technology Chinese Academy of Sciences Chongqing 400714 China

We report the synthesis of Nd-filled and Fe substituted p-type Ndx Fe（3.2）Co（0.8）Fe（3.2）Co（0.8）Sb（12）（x=0.5,0.6,0.7,0.8,and 0.9）skutterudites by the solid-state reaction *** influences of Nd filler on the electrical and thermal transport prop-erties are investigated in a temperature range from room temperature to 850 K.A lowest lattice thermal conductivity of 0.88 W·m^-1·K^-1 is obtained in Nd0.8Fe（3.2）Co（0.8）Fe（3.2）Co（0.8）Sb（12）at 673 K,which results from the localized vibration modes of fillers and the increase of grains ***,the maximum power factor is 2.77 m W·m^-1·K^-2 for the Nd（0.9）Fe（3.2）Co（0.8）Fe（3.2）Co（0.8）Sb（12）sample at 668 ***,the highest dimensionless figure of merit z T=0.87 is achieved at 714 Kfor Nd（0.9）Fe（3.2）Co（0.8）Fe（3.2）Co（0.8）Sb（12）.

关键词： thermoelectric p-type skutterudites neodymium filler lattice thermal conductivity

Molecular beam epitaxy growth of monolayer hexagonal MnTe_(2)on Si(111)substrate

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Chinese Physics B 2021年第12期30卷 142-147页

作者： S Lu K Peng P D Wang A X Chen W Ren X W Fang Y Wu Z Y Li H F Li F Y Cheng K L Xiong J Y Yang J Z Wang S A Ding Y P Jiang) L Wang Q Li F S Li L F Chi Institute of Functional Nano&Soft Materials(FUNSOM) Soochow UniversitySuzhou 215123China Vacuum Interconnected Nanotech Workstation(Nano-X) Suzhou Institute of Nano-Tech and Nano-Bionics(SINANO)Chinese Academy of Sciences(CAS)Suzhou 215123China Key Laboratory of Polar Materials and Devices(MOE) Department of ElectronicSchool of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241China School of Physical Science and Technology Southwest UniversityChongqing 400715China School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026China

Monolayer MnTe_(2)stabilized as 1 T structure has been theoretically predicted to be a two-dimensional(2 D)ferromagnetic metal and can be tuned via strain *** is no naturally van der Waals(vdW)layered MnTe_(2)bulk,leaving mechanical exfoliation impossible to prepare monolayer MnTe_(2).Herein,by means of molecular beam epitaxy(MBE),we successfully prepared monolayer hexagonal MnTe_(2)on Si(111)under Te rich *** reflection high-energy electron diffraction(RHEED)and low-energy electron diffraction(LEED)patterns suggest the monolayer is atomically flat without surface *** valence state of Mn^(4+)and the atom ratio of([Te]:[Mn])further confirm the MnTe_(2)*** tunneling spectroscopy(STS)shows the hexagonal MnTe_(2)monolayer is a semiconductor with a large bandgap of~2.78 *** valence-band maximum(VBM)locates at theΓpoint,as illustrated by angle-resolved photoemission spectroscopy(ARPES),below which three hole-type bands with parabolic dispersion can be *** successful synthesis of monolayer MnTe_(2)film provides a new platform to investigate the 2D magnetism.

关键词： molecular beam epitaxy hexagonal MnTe_(2) band structure

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