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Improved piezoelectric and luminescent properties in Sm-modified Bi_(0.5)Na_(0.5)TiO_(3)-BaTiO_(3) multifunctional ceramics

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Journal of Materiomics 2024年第4期10卷 803-810页

作者： Shuai Cheng Kehong Zhang Chongyang Li Boping Zhang Jianguo Chen Kang Sun Changrong zhou Jingtai Zhao Qisheng Lin guanghui rao Siqi Shi School of Materials Science and Engineering Shanghai UniversityShanghai200444China Guangxi Key Laboratory of Information Materials&School of Materials Science and Engineering Guilin University of Electronic TechnologyGuilin541004GuangxiChina School of Materials Science and Engineering University of Science and Technology BeijingBeijing100083China School of Information Engineering Lanzhou University of Finance and EconomicsLanzhou730020China

The 0.93(Na_(0.5)Bi_(0.5))_(1–x)Sm_(x)TiO_(3)-0.07BaTiO_(3) multifunctional ceramics were prepared by solid-phase reaction *** phase structure,microstructure,electrical and photoluminescent properties were systematically *** increasing x,the ceramics undergoes the phase transition from rhombohedral to tetragonal with some rhombohedral distortion,along with a reduced grain size and increased relative *** the other hand,the Sm3+doping enhances the electric-field driven reversible phase transition and domain size,and reduces the domain walls,thereby contributing to improved piezoelectricity and decreased depolarization temperature(T_(d))from 91℃ to 40℃.Excellent piezoelectric properties of d_(33)=213 pC/N and kp=29.9% are achieved in the x=0.010 *** excitation(407 nm),the Sm^(3+)-doped ceramic exhibits bright reddish-orange fluorescence at 564,599,646 nm and 710 nm.A polarization-induced enhancement of photoluminescence is obtained in BNBT-_(x)Sm ceramics with an improved relative intensity of emission band at 646 *** results indicate that Sm^(3+)-doped BNBT ceramics show great potential in electro-optic integration and coupling device applications.

关键词： Piezoelectricity Curie temperature Phase transitions Thermal stability Photoluminescence

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Development of thermodynamic database of the Mn-RE(RE=rare earth metals)binary systems

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Materials Genome Engineering Advances 2024年第2期2卷 53-82页

作者： Hongjian Ye Jiang Wang Qing Chen guanghui rao Huaiying Zhou School of Materials Science and Engineering&Guangxi Key Laboratory of Information Materials Guilin University of Electronic TechnologyGuilinChina Engineering Research Center of Electronic Information Materials and Devices Ministry of EducationGuilin University of Electronic TechnologyGuilinChina Thermo-Calc Software AB StockholmSweden

In this work,eight Mn-RE(RE=Ce,Pr,Sm,Tb,Er,Tm,Lu,and Y)binary systems were reassessed thermodynamically by the CALPHAD method based on the reported optimizations and experimental ***-consistent thermodynamic parameters to describe Gibbs energies of various phases in eight Mn-RE binary systems were *** calculated phase equilibria and thermodynamic properties of eight Mn-RE binary systems are in good accor-dance with the experimental ***,phase equilibria and ther-modynamic properties of 13 Mn-RE(RE=La,Ce,Pr,Nd,Sm,Gd,Tb,Dy,Ho,Er,Tm,Lu,and Y)binary systems were discussed systematically in combination with the present calculations and the reported optimizations.A trend was found for the variation of phase equilibria and thermodynamic properties of the Mn-RE binary *** general,as the RE atomic number increases,the enthalpies of mixing of liquid alloys as well as the enthalpies of formation of the intermetallic compounds become increasingly negative,and the formation temperatures of the intermetallic compounds become *** results provide a complete set of self-consistent thermodynamic parameters for the Mn-RE binary systems,and a thermodynamic database of 13 Mn-RE binary systems was finally achieved.

关键词： Mn-RE binary systems phase equilibria thermodynamic

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BaSrGa_(4)O_(8):Tb^(3+)力致发光材料的制备及性能

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无机材料学报 2024年第10期39卷 1107-1113页

作者：史瑞刘伟李林李欢张志军饶光辉赵景泰桂林电子科技大学材料科学与工程学院桂林541004 桂林电子科技大学信息材料广西重点实验室桂林541004 桂林电子科技大学机械工程学院桂林541004

力致发光材料独特的机械能-光能转换方式使其在应力传感领域具有广泛的应用前景,并有望成为新一代可视化应变传感材料。目前拓展力致发光材料体系和提高其性能仍然是研究的重点。本研究采用BaSrGa_(4)O_(8)基质(六方晶系,空间群为P6_(3)... 详细信息

力致发光材料独特的机械能-光能转换方式使其在应力传感领域具有广泛的应用前景,并有望成为新一代可视化应变传感材料。目前拓展力致发光材料体系和提高其性能仍然是研究的重点。本研究采用BaSrGa_(4)O_(8)基质(六方晶系,空间群为P6_(3),具有非中心对称结构),通过高温固相反应法合成了系列Tb^(3+)掺杂绿色力致发光荧光粉。材料在不同的力学激励(拉伸、压缩、扭曲)下都可以发出明亮的绿光。用玻璃棒在制备的力致发光弹性体上分别书写B、S、G、O、T、b,观察到清晰的笔记映射,通过分析力致发光图像的颜色映射值,可追溯材料在书写过程中的受力情况,这是首次在上述基质掺杂体系中观测到的力致发光现象。在254 nm紫外光激发下,BaSr_(1-x)Ga_(4)O_(8):xTb^(3+)荧光粉亦呈现发射波长为543 nm的明亮绿光,这归因于Tb^(3+)的^(5)D_(4)-^(7)F_(5)跃迁,具有和力致发光同样的发光中心,去除紫外照射后样品仍显示出强烈的余辉发光。通过力致发光、光致发光、长余辉发光结合热释光分析,进一步阐明了三者之间的内在联系。本研究拓宽了高性能力致发光材料体系的范围,其在可视化应力传感、信息安全防伪等领域展现出潜在的应用前景。

关键词：力致发光长余辉发光应力传感荧光粉

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新型应力发光材料Ca_(5)Ga_(6)O_(14):Sm^(3+)制备及其性能

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发光学报 2024年第6期45卷 959-969页

作者：王强刘伟杜玉松李欢张志军饶光辉程帅赵景泰桂林电子科技大学材料科学与工程学院广西桂林541004 桂林电子科技大学广西信息材料重点实验室广西桂林541004 桂林电子科技大学机电工程学院广西桂林541004

采用高温固相法成功制备出新型Ca_(5-x)Ga_(6)O_(14):xSm^(3+)应力发光材料。通过X射线衍射、扫描电镜、漫发射光谱、光致激发和发射光谱、荧光衰减曲线、应力发光光谱和热释光光谱等测试详细研究了Ca_(5-x)Ga_(6)O_(14):xSm^(3+)的晶... 详细信息

采用高温固相法成功制备出新型Ca_(5-x)Ga_(6)O_(14):xSm^(3+)应力发光材料。通过X射线衍射、扫描电镜、漫发射光谱、光致激发和发射光谱、荧光衰减曲线、应力发光光谱和热释光光谱等测试详细研究了Ca_(5-x)Ga_(6)O_(14):xSm^(3+)的晶体结构、表面形貌、光致发光和应力发光性能及其发光机理。在404 nm激发下,Ca_(5-x)Ga_(6)O_(14):xSm^(3+)呈现出4个发射峰,分别位于562,599,642,715 nm,对应Sm^(3+)的^(4)G_(5/2)→6Hj(j=5/2,7/2,9/2,11/2)的特征发射。随着Sm^(3+)离子掺杂浓度的增加,发光强度先增强后减弱,在x=0.07时获得最强发射,且衰减时间从1.92 ms缩短至1.30 ms。在滑动摩擦激发下可获得Ca_(5-x)Ga_(6)O_(14):xSm^(3+)的应力发光发射带,且应力发光强度与施加应力满足线性增长,表明该材料在应力传感领域具有潜在应用价值。

关键词：应力发光 Ca_(5)Ga_(6)O_(14) Sm^(3+)

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三峡水库对城陵矶防洪补偿控制水位研究Ⅰ——需求分析与优化条件

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人民长江 2024年第1期55卷 21-27页

作者：邹强胡挺肖扬帆饶光辉何小聪长江勘测规划设计研究有限责任公司湖北武汉430010 流域水安全保障湖北省重点实验室湖北武汉430010 中国长江三峡集团有限公司湖北宜昌443133

城陵矶地区是长江中下游洪灾最频发的区域之一,是长江水库群防洪的重点保护对象。金沙江下游乌东德、白鹤滩、溪洛渡、向家坝4座梯级水库与三峡水库组成的巨型水库群防洪能力巨大,显著改变了流域防洪调度格局。在概括分析城陵矶地区防... 详细信息

城陵矶地区是长江中下游洪灾最频发的区域之一,是长江水库群防洪的重点保护对象。金沙江下游乌东德、白鹤滩、溪洛渡、向家坝4座梯级水库与三峡水库组成的巨型水库群防洪能力巨大,显著改变了流域防洪调度格局。在概括分析城陵矶地区防洪需求,回顾三峡水库对城陵矶地区防洪补偿控制水位不同阶段成果的基础上,剖析了优化防洪补偿控制水位的研究要点,研究了金沙江下游梯级防洪库容投入情况,进而明确了提高防洪补偿控制水位的有利条件。研究结果表明:在三峡水库水位达到城陵矶防洪补偿控制水位158.00 m后,金沙江下游梯级水库在预留40.93亿m^(3)防洪库容的基础上,尚有30亿~60亿m^(3)富余防洪库容可配合运用,为进一步提高三峡水库对城陵矶防洪补偿控制水位创造了良好条件。

关键词：防洪补偿控制水位联合防洪调度城陵矶地区金沙江下游梯级水库三峡水库

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三峡水库对城陵矶防洪补偿控制水位研究Ⅱ——风险分析与运用方案

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人民长江 2024年第2期55卷 1-8,34页

作者：邹强胡挺饶光辉何小聪肖扬帆长江勘测规划设计研究有限责任公司湖北武汉430010 流域水安全保障湖北省重点实验室湖北武汉430010 中国长江三峡集团有限公司湖北宜昌443133

乌东德、白鹤滩水库投运后,长江上游水库群联合防洪调度为进一步提高三峡水库对城陵矶防洪补偿控制水位创造了有利条件。为提高三峡水库对城陵矶防洪补偿控制水位,针对金沙江下游梯级防洪库容投入运用条件,基于三峡坝址不同典型年的不... 详细信息

乌东德、白鹤滩水库投运后,长江上游水库群联合防洪调度为进一步提高三峡水库对城陵矶防洪补偿控制水位创造了有利条件。为提高三峡水库对城陵矶防洪补偿控制水位,针对金沙江下游梯级防洪库容投入运用条件,基于三峡坝址不同典型年的不同频率设计洪水,开展了荆江防洪和库区回水风险分析,提出了金沙江下游梯级配合三峡水库的等比例分级拦蓄方式,在确保荆江及库区防洪安全的前提下,提出了三峡水库对城陵矶防洪补偿控制水位优化运用方案,给出了金下梯级预留防洪库容与三峡水库对荆江防洪库容的等效关系。研究结果表明:提出的等比例分级拦蓄方式综合了拦量和削峰两种模式,有效利用了金下梯级防洪库容,调度效果最好;提出的水位优化运用方案具备较好的防洪减灾效果,丰富完善了长江上游水库群联合防洪调度方案,可进一步减少中下游超额洪量。研究成果可为长江水库群实际洪水调度提供技术支撑和决策参考。

关键词：防洪补偿控制水位风险分析荆江河段城陵矶地区金沙江下游三峡水库

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Effect of wheel speed on phase formation and magnetic properties of (Nd_(0.4)La_(0.6))-Fe-B melt-spun ribbons

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Journal of Rare Earths 2018年第11期36卷 1179-1183页

作者： Liang Wang Jiang Wang Maohua Rong guanghui rao Huaiying Zhou School of Material Science and Engineering & Guangxi Key Laboratory of Information Materials Guilin University of Electronic Technology Guilin 541004China

The effect of wheel speed on phase formation and magnetic properties of （Ndo.4La0.6）lsFeTzsBzs and （Ndo.4La0.6）13.4Fe79.9B6.7 ribbons prepared by melt-spinning method was investigated experimentally. Based on X-ray diffraction results, all melt-spun ribbons consist of the main phase with the tetragonal 2：14：1 type structure and the minor α-Fe phase. Magnetic measurements show the maximum magnetic energy product （（BH）max） and the remanence （Mr） increases firstly and then decreases with the increase of wheel speed, while the coercivity （Hci） increases, resulting from the variation of the average volume fraction of the ^-Fe phase and the average grain size in the melt-spun ribbons. Using Henkel plots, the interaction between the 2：14：1 phase and the ^-Fe phase in the melt-spun ribbons was analyzed and the intergranular exchange coupling is manifested. Optimal magnetic properties of Hci - 7.27 kOe, Mr - 90.94 emu/g and （BH）max -- 12.10 MGOe are achieved in the （Ndo.4La0.6）lsFeTzsBT.s ribbon with the wheel speed of 26 m/s. It indicates that magnetic properties of Nd-Fe-B melt-spun ribbons with highly abundant rare earth element La can be improved by optimizing alloy composition and preparation process.

关键词： Nd-La-Fe-B ribbons Phase formation Melt-spinning Magnetic properties Rare earths

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Observation of table-like magnetocaloric effect and large refrigerant capacity in Nd_(6)Fe_(13)Pd_(1-x)Cu_(x) compounds

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Journal of Rare Earths 2022年第4期40卷 660-669,I0006页

作者： Yusong Du Chaohua Zhang Youming Lu Junqin Li Gang Cheng Jiang Wang guanghui rao College of Materials Science and Engineering Shenzhen UniversityShenzhen 518060China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China Guangxi Key Laboratory of Information Materials Guilin University of Electronic TechnologyGuilin 541004China

The table-like magnetocaloric effect is significant for the magnetic refrigeration applications above 20 K based on the Ericsson ***,we prepared a series of Nd_(6)Fe_(13)Pd_(1-x)Cu_(x)(x=0.05,0.1,0.15)compounds by the arc-melting *** compounds show the single crystalline phase in the tetragonal Nd_(6)Fe_(13)Si-type structure with the space group I4/mcm.A magnetic phase transition from ferromagnetism to antiferromagnetism and a metamagnetic transition from the antiferromagnetic state to the ferromagnetic state are observed in each of the *** compounds exhibit table-like magnetocaloric effects with large refrigerant capacities.A constantΔSM in a temperature span of 40 K in the Nd_(6)Fe_(13)Pd_(0.85)Cu_(0.15) compound are *** a field change of 0–5 T,the peak values of–ΔS_(M) for the Nd_(6)Fe_(13)Pd_(0.95)Cu_(0.05),Nd_(6)Fe_(13)Pd_(0.90)Cu_(0.10),and Nd_(6)Fe_(13)Pd_(0.85)Cu_(0.15) compounds are estimated to be 4.8,4.6 and 4.4 J/(kg·K)with corresponding refrigerant capacity values of 323,331 and 316 J/kg,*** obtained table-like magnetocaloric effects with large refrigerant capacities as well as fairly small thermal and magnetic hysteresis deem these series of compounds good candidates for single-phase magnetic refrigeration based on the Ericsson cycle.

关键词： Rare earth-based compound Crystal structure Magnetic transition Magnetocaloric effect

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Phase diagrams of permanent magnet alloys: Binary rare earth alloy systems

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Journal of Rare Earths 2019年第10期37卷 1040-1046页

作者： Kaicheng Yang Jiang Wang Qingrong Yao Zhao Lu Maohua Rong Huaiying Zhou guanghui rao School of Materials Science and Engineering & Guangxi Key Laboratory of Information Materials Guilin University of Electronic Technology

Thermodynamic optimization of the binary rare earth alloy(Cee La, Cee Pr, Cee Nd and Lae Nd) systems was performed in this work through the CALPHAD method based on the critical evaluation of all available phase diagram and thermodynamic data reported in the literature. During the thermodynamic modeling, the solution phases including liquid, bcc, fcc and dhcp, were treated as the substitutional solution model. Thermodynamic parameters of the stable phases in the Cee La, Cee Pr, Cee Nd and Lae Nd binary systems are obtained finally and would be used directly to develop the thermodynamic database of the multi-component Nde Fee B-based alloys, which is indispensable for designing alloy compositions and processes of Nde Fee B permanent magnets with highly abundant rare earth metals.

关键词： Permanent magnets Rare earth alloys Phase diagrams CALPHAD

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Effect of Dy on Structure and Magnetic Properties of CoPt Alloys

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Journal of Wuhan University of Technology(Materials Science) 2013年第4期28卷 840-843页

作者：成钢 PANG Kuang MA Lei GU Zhengfei HE Wei rao guanghui School of Materials Science and Engineering Guilin University of Electronic Technology Key Laboratory of Nonferrous Metals and New Processing Technology of Materials Ministry of Education Institute of Materials Science Guangxi University

The effects of Dy on the microstructure and magnetic properties of DyxCo50-xPt50 alloys were investigated. The XRD results indicate that all the alloys homogenized at 1000 ℃ contain only a single A 1 （fcc） phase, while the alloys annealed at 675℃ consist of a hard-magnetic face-eentered-tetragonal （fct） phase and a magnetically soft face-centered-cube （fcc） phase. Maximum values for the coercivity and remanence ratio mr were achieved in DY0.4Co49.6Pt50 alloys annealed at 675 ℃ for 80 min. For the series of Dy Co50-xPt50 alloys annealed at 675 ℃ for 60 min, H decreases monotonically with increasing Dy concentration, but mr is first enhanced and then weakened,

关键词： magnetic properties degree of ordering Co-Pt alloys crystal structure

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