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Understanding secondary phase inclusion and composition variations in the microstructure design of n-type Bi_(2)Te_(3) alloys via selective dissolution of kcl

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Journal of Advanced Ceramics 2023年第12期12卷 2360-2370页

作者： Gwang Min Park Seunghyeok Lee Jun-Yun Kang Seung-Hyub Baek Heesuk Kim Jin-Sang Kim Seong Keun Kim KU-KIST Graduate School of Converging Science and Technology Korea UniversitySeoul 02841Republic of Korea Electronic Materials Research Center Korea Institute of Science and TechnologySeoul 02792Republic of Korea Department of Materials Science and Chemical Engineering Hanyang UniversityAnsan 15588Republic of Korea Ferrous Alloy Department Korea Institute of Materials ScienceChangwon 51508Republic of Korea Soft Hybrid Materials Research Center Korea Institute of Science and TechnologySeoul 02792Republic of Korea Institute of Advanced Composite Materials Korea Institute of Science and TechnologyWanju 55324Republic of Korea

This study investigated the effects of kcl treatment on microstructure and thermoelectric properties of n-type Bi_(2)Te_(2.7)Se_(0.3)(BTS)thermoelectric *** innovative kcl treatment was originally intended to introduce nanopores through selective dissolution of kcl from a mixture of thermoelectric materials and ***,it unexpectedly induced substantial variations in material composition and microstructure during the subsequent spark plasma sintering(SPS)*** groups adsorbed on the powder surface during the dissolution resulted in the emergence of a Bi_(2)TeO_(5) secondary phase within the BTS matrix after the SPS process at 450℃.The concentration of Bi_(2)TeO_(5) increased with an increase in the kcl ***,a remarkable grain growth occurred at low kcl concentrations,likely due to the liquid-phase formation in a Te-rich composition during ***,excessive Bi_(2)TeO_(5) at higher kcl concentrations hindered grain *** variations in the microstructure had complex effects on electrical properties:The TeBi antisite defects increased the electron concentration,and Bi_(2)TeO_(5) reduced electron ***,the lattice thermal conductivity decreased due to the presence of Bi_(2)TeO_(5),from 0.8 W·m^(−1)·K^(−1) at 298 K for the pristine BTS to 0.6 W·m^(−1)·K^(−1) at 298 K for BTS treated with 1 wt%*** insights allowed precise adjustments of the electrical and thermal conductivities,leading to an enhancement in the maximum value of figure-of-merit(ZT)from 0.76 to 0.96 through the selective dissolution of kcl *** believe that our observations potentially enable advances in thermoelectric materials by engineering microstructures.

关键词： thermoelectric materials Bi_(2)Te_(3) Bi_(2)TeO_(5) grain growth n-type kcl

Measurement on Physicochemical Properties ofNaCl-kcl-ScCl_3 System for Manufacture of Al-Sc Alloy by Molten Salt Electrolysis

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Journal of Materials Science & Technology 1999年第2期15卷 155-158页

作者： Yanwen TIAN Benliang SUN and Yuchun ZHAI(Materials and Metallurgy School, Northeastern University, Shenyang 110006, China) Materials and Metallurgy School Northeastern University Shenyang 110006 China

The physicochemical properties of the system, such as density, surface tension, specific conductance and melting point were measured. The results were discussed.

关键词： kcl Sc Measurement on Physicochemical Properties ofNaCl-kcl-ScCl3 System for Manufacture of Al-Sc Alloy by Molten Salt Electrolysis Al

Effects of inhibitor kcl on shale expansibility and mechanical properties

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Petroleum 2019年第4期5卷 407-412页

作者： Xiangchao Shi Lei Wang Jianhua Guo Qiang Su Xiao Zhuo State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500China Engineering Technology Research Institute of South West Oil and Gas Field Company CNPCChengdu610000China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China

The expansibility and mechanical properties of shale are significantly influenced by water-based muds(WBMs);thus,it is necessary to mitigate this effect to avoid borehole instabilities in drilling *** chloride(kcl)is usually used as inhibitor to reduce hydration of *** this study,we investigated the inhibitory efficiency of kcl on shale through a series of experiments,including dynamic linear swelling(DLS)tests and uniaxial compressive strength(UCS)tests,to provide reference for the design of *** tests were conducted on shale samples soaked in kcl solution for 24,48,72,and 96 h with saline concentrations of 0%,2%,4%,6%,and 8%.Experimental results show that samples with microcracks and bedding fissures have the highest swelling increase and the largest strength reduction after immersion in *** swelling potential decreased with increasing kcl *** addition,kcl exhibited a certain inhibitory effect on the weakening of the mechanical properties of *** increase in the kcl concentration increases the compressive strength and elastic modulus,and decreases the Poisson's ***,in terms of homogeneous samples,the UCS test results show that exposure to water is weakly related to weakening of the mechanical properties of shale *** found that immersing the shale in kcl solution for a longer time decreases the compressive strength,increases the Poisson's ratio,and decreases the elastic modulus.

关键词： kcl Inhibitor Expansibility Mechanical properties Bedding fissures

Rheology and lubricity characteristics study at different temperatures using synthesized SnO_(2) nanoparticles in kcl free bentonite water base mud

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Petroleum Research 2023年第4期8卷 541-549页

作者： A.B.M.Ariful Bari Khandaker Nayem Ahmed Md Saiful Alam Department of Petroleum and Mining Engineering Shahjalal University of Science and TechnologySylhet3114Bangladesh Department of Petroleum and Mining Engineering Jashore University of Science and TechnologyJashore7408Bangladesh

Drilling mud is a major concerning element due to its high operational and economic impact on the drilling *** additives are introduced to enhance the efficiency of drilling fluid,but none of them could perfectly achieve their proposed efficacy in drilling *** conceived several nanoparticles(NPs)in drilling fluid to dissolve this *** a singular instance,commercial tin oxide(SnO_(2))nanoparticles were utilized to analyze the influence of NPs on the rheological and filtration properties of inorganic kcl salt-based drilling ***,the effect of SnO_(2) NPs on mud lubricity characteristics is not studied ***,due to the hazardous behavior of kcl,its use is very ***,we consider a kcl-free bentonite water-based mud to avoid any environmental damages from drilling *** also use SnO_(2) NPs that is synthesized in our laboratory by co-precipitation *** addition to rheological and filtration properties,we also investigate the effect of NPs on mud's lubricity that was not considered in the previous *** fluid properties are measured at five different NPs concentrations of 0.10,0.25,0.50,0.75&1.0 wt%,and at six different temperatures of 30,40,50,60,70,and 80°C,while filtration properties are measured using API low-pressure low temperature(LPLT)*** addition of 0.1 wt%SnO_(2) NPs increases plastic viscosity,yield point,10 s gel strength,and 10 min gel strength by 10%,63%,20%,and 14%,*** maximum reduction in lubricity coefficient is found to be 14%at NPs concentration of 1.0 wt%.The NPs concentration of 0.5 wt%yielded a reduction in fluid loss and mud cake thickness by 8.1%and 34%,*** study suggests that SnO_(2) NPs can be employed as an additive to improve the rheology,lubricity,and filtration properties of kcl-free bentonite water-based drilling mud.

关键词： Mud Rheology Lubricity Tin oxide Nanoparticles kcl

Betaine accumulation and the change of betaine-aldehyde dehydrogenase activity in barley seedlings under kcl and NaCl stress

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Journal of Environmental Sciences 1999年第4期11卷 415-418,442页

作者： YI Yan-jun XU Cheng-shui ZHAO Bo-sheng LIU Jia-yao WANG Xue-chen Department of Biology Qufu Normal UniversityQufu 273165China Department of Biology Zibo CollegeZibo 255013China College of Biology Chinese Agricultural Universi tyBeijing 100094China

The changes in growth status, ion contents, betaine levels and betaine\|aldehyde dehydrogenase (BADH) activity in seedlings of nonhalophyte barley treated with different concentrations of NaCl and kcl were studied. Results showed that the inhibition of growth in barley seedlings increased as enhancing NaCl and kcl for 96h and NaCl inhibitory degree was higher than that of kcl. The K\++ content of barley seedlings in NaCl was lower than the control, while the Na\++ content was higher, the levels of Na\++ fell in the seedlings treated with kcl, but K\++ levels rose, and K\++ content was higher than that of Na\++. The betaine levels of barley shoots rose with the increase in both external salt concentration and treatment time. Higher BADH activity was observed in low\|salt concentration but lower slightly in high\|salt concentration.

关键词： betaine betaine-aldehyde dehydrogenase(BADH) activity NaCl kcl barley

NH_4Cl/kcl添加剂对铝粉氮化反应的影响

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无机材料学报 2004年第1期19卷 69-74页

作者：邱羽高濂中国科学院上海硅酸盐研究所高性能陶瓷与超微结构国家重点实验室上海200050

研究了NH4Cl/kcl添加剂对铝粉氮化反应的影响.运用TG/DSC考察了Al粉、Al+NH4Cl和Al+NH4Cl/kcl等前驱体粉末的氮化过程.运用XRD、SEM、XRF对氮化产物进行了表征.研究结果表明:NH4Cl能降低氮化温度,避免铝粉发生熔化和结块,保证得到纳米... 详细信息

研究了NH4Cl/kcl添加剂对铝粉氮化反应的影响.运用TG/DSC考察了Al粉、Al+NH4Cl和Al+NH4Cl/kcl等前驱体粉末的氮化过程.运用XRD、SEM、XRF对氮化产物进行了表征.研究结果表明:NH4Cl能降低氮化温度,避免铝粉发生熔化和结块,保证得到纳米尺度的AlN颗粒;kcl的蒸发则可以破坏铝粉表面的氮化膜,促进铝粉的完全氮化,且只有两种同时作为添加剂使用,才能实现铝粉的完全氮化.用氨气做为反应气体可以消除因添加剂引入水分杂质的影响.NH4Cl/kcl还是一种低残留的添加剂,可以用来制备高纯度的AIN.

关键词： NH4Cl kcl 铝粉氮化

kcl辅助EDTA水热合成t-LaVO_4∶Eu^(3+)粉体

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人工晶体学报 2015年第9期44卷 2363-2368页

作者：王莉丽许茜刘连利张帆宋秋实东北大学材料与冶金学院沈阳110034 渤海大学实验管理中心锦州121013

以La Cl3·n H2O、Eu2O3和NH4VO3为原料,采用kcl和EDTA为辅助剂,在较高p H值下水热合成了t-La VO4∶Eu3+粉体。通过添加kcl和EDTA的不同组合,分析了对La VO4∶Eu3+粉体微观结构及荧光性能的影响。结果表明:当初始溶液p H=11和12时,添加K... 详细信息

以La Cl3·n H2O、Eu2O3和NH4VO3为原料,采用kcl和EDTA为辅助剂,在较高p H值下水热合成了t-La VO4∶Eu3+粉体。通过添加kcl和EDTA的不同组合,分析了对La VO4∶Eu3+粉体微观结构及荧光性能的影响。结果表明:当初始溶液p H=11和12时,添加kcl+EDTA可制备单一四方相La VO4∶Eu3+粉体,并推断了La VO4∶Eu3+晶体的形成机理。加入kcl影响了La VO4∶Eu3+的晶体结构,使La VO4∶Eu3+粉体颗粒尺寸增大,荧光性能增强。当Eu掺杂摩尔浓度为5%时,La VO4∶Eu3+束状棒有最高的红光发射强度。

关键词：钒酸镧水热法荧光 kcl EDTA

kcl对含有纳米银的[Ru(bpy)_3]^(2+)荧光性能影响

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光谱学与光谱分析 2007年第7期27卷 1377-1380页

作者：王悦辉周济石士考清华大学新型陶瓷与精细工艺国家重点实验室北京100084

通过吸收光谱、荧光光谱等手段研究了kcl对含有纳米银的金属钌联吡啶配合物([Ru(bpy)3]2+)的荧光性能的影响。结果表明,kcl与纳米银粒子间存在较强的相互作用,这种强的相互作用破坏了[Ru(bpy)3]2+与纳米银粒子间的链状网络结构,形成大... 详细信息

通过吸收光谱、荧光光谱等手段研究了kcl对含有纳米银的金属钌联吡啶配合物([Ru(bpy)3]2+)的荧光性能的影响。结果表明,kcl与纳米银粒子间存在较强的相互作用,这种强的相互作用破坏了[Ru(bpy)3]2+与纳米银粒子间的链状网络结构,形成大颗粒和团聚体。同时,在吸收光谱的长波段处观察到明显的新的吸收带,随着kcl量的增加,新吸收带峰值逐渐红移并展宽。随着kcl量的增加,[Ru(bpy)3]2+荧光强度先猝灭而后逐渐增强,直至达到一个定值。文章从分子间的相互作用、能量传递等方面探讨了kcl对含有纳米银的[Ru(bpy)3]2+荧光性能影响机理。

关键词： kcl 纳米银 [Ru(bpy)3]^2+ 荧光增强荧光猝灭

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紫外线激发后kcl:Cu^+的光激励发光

光谱学与光谱分析 2005年第10期25卷 1733-1735页

作者：孙力王永生赵谡玲徐征薛炜炜北京交通大学光电子技术研究所信息存储显示与材料部级开放实验室北京100044

用固相反应法制备了kcl:Cu+多晶样品。经紫外光辐照后,用560 nm的光照射能产生近紫外蓝光的光激励发光。研究表明,Cu+作为发光中心,经紫外光辐照后并没有产生Cu+到Cu2+的变价,即Cu+不是空穴俘获中心,而阴离子空位充当电子陷阱。当激发... 详细信息

用固相反应法制备了kcl:Cu+多晶样品。经紫外光辐照后,用560 nm的光照射能产生近紫外蓝光的光激励发光。研究表明,Cu+作为发光中心,经紫外光辐照后并没有产生Cu+到Cu2+的变价,即Cu+不是空穴俘获中心,而阴离子空位充当电子陷阱。当激发后的样品受到光激励时,电子与空穴中心或VK心复合后将能量传递给Cu+离子,产生d-s跃迁的特征发射。

关键词：光激励发光 kcl Cu^+ 电子俘获