材料期刊网

Electricity production by a microbial fuel cell fueled by brewery wastewater and the factors in its membrane deterioration

Af?in Y. ?etinkaya , Emre O?uz K?ro?lu , Neslihan Manav Demir , Derya Y?lmaz Baysoy , Bestamin ?zkaya , Mehmet ?akmak??

催化学报 doi:10.1016/S1872-2067(15)60833-6

关键词:

Lu-Si-O体系在高温水蒸气环境中的腐蚀行为

洪智亮 , 成来飞 , 鲁琳静 , 张立同 , 王一光

无机材料学报 doi:10.3724/SP.J.1077.2010.00186

采用溶胶-凝胶法制得三种镥硅酸盐体系粉体材料. 以氧化物的摩尔比来表示此三种粉体, 分别为：Lu₂O₃·SiO₂、Lu₂O₃·2SiO₂和Lu₂O₃·2.26SiO₂. 在1400℃、50%H₂O-50%O₂静态常压气氛下, 研究了它们的耐水蒸气腐蚀性能.以单位面积重量变化率表征材料的耐水蒸气腐蚀性能, 结合X射线衍射（XRD）、傅里叶红外光谱（FTIR）和扫描电镜能谱分析（SEMEDS）等分析手段, 揭示了镥硅酸盐体系在高温水蒸气环境中的腐蚀机制和反应机理. 结果表明：三种原始粉体主要物相依次为：Lu₂SiO₅+Lu₂Si₂O₇、 Lu₂Si₂O₇+SiO₂和Lu₂Si₂O₇+SiO₂. 在水蒸气作用下, Lu₂SiO₅相与Al₂O₃反应生成新相Lu₃Al₅O₁₂, 而Lu₂Si₂O₇相并未受到水蒸气的作用而发生任何反应, 表现出优异的化学稳定性.

关键词: Lu₂SiO₅ , Lu₂Si₂O₇ , environmental barrier coating (EBC) , water vapor corrosion

Lu-Si-O体系在高温水蒸气环境中的腐蚀行为

洪智亮 , 成来飞 , 鲁琳静 , 张立同 , 王一光

无机材料学报 doi:10.3724/SP.J.1077.2010.00186

采用溶胶-凝胶法制得三种镥硅酸盐体系粉体材料.以氧化物的摩尔比来表示此三种粉体,分别为:Lu_2O_3·SiO_2、Lu_2O_3·2SiO_2和Lu_2O_3·2.26SiO_2.在1400℃、50%H_2O-50%O_2静态常压气氛下,研究了它们的耐水蒸气腐蚀性能.以单位面积重量变化率表征材料的耐水蒸气腐蚀性能,结合X射线衍射(XRD)、傅里叶红外光谱(FTIR)和扫描电镜能谱分析(SEM-EDS)等分析手段,揭示了镥硅酸盐体系在高温水蒸气环境中的腐蚀机制和反应机理.结果表明:三种原始粉体主要物相依次为:Lu_2SiO_5+Lu_2Si_2O_7、Lu_2Si_2O_7+SiO_2和Lu_2Si_2o_7+SiO_2.在水蒸气作用下,Lu_2SiO_5相与Al_2O_3反应生成新相Lu_3Al_5O_(12)而Lu_2Si_2O_7相并未受到水蒸气的作用而发生任何反应,表现出优异的化学稳定性.

关键词: Lu_2SiO_5 , Lu_2Si_2O_7 , 环境障碍涂层 , 水蒸气腐蚀

R2O-RO-SiO2-B2O3-Al2O3系统乳浊釉的制备及微观结构分析

王超 , 张力

硅酸盐通报

通过调整配方组成,成功制备了R2O-RO-SiO2-B2O3-A12 O3多元系统无锫乳浊釉,重点探讨了釉料化学组成关系对釉面乳浊程度的影响,采用扫描电子显微镜(SEM)研究了釉层微观结构及釉层乳浊机理.结果表明:釉料组成中n(R2O)/n(RO)、n(CaO)/n (MgO)、n(SiO2+ B2O3)/n(Al2O3)对釉面白度及质量影响显著.当n(R2O)/n(RO)在0.38～0.49、n(CaO)/n(MgO)在1.03～2.19、n(SiO2+ B2O3)/n(Al2O3)在12.69 ～18.42范围时,釉面自度高、质量好.釉面乳浊的原因是由析晶与分相共同作用,分相促进了晶体的析出,晶体形状主要为短柱状,尺寸约1～4 im,并以类球状团聚包裹形式分散于釉层中.

关键词: 乳浊釉 , 分相 , 析晶 , 显微结构

Effects of Phase Composition on Microstructure and Mechanical Properties of Lu₂O₃-doped Porous Silicon Nitride Ceramics

Quan Li

材料科学技术（英文）

Porous silicon nitride ceramics (Si₃N₄) were fabricated by pressureless sintering using different particle size of silicon nitride powder. Lu₂O₃ was used as sintering additive. According to phase relationships in the ternary system Si₃N₄-SiO₂-Lu₂O₃, porous Si₃N₄ ceramics with different phase composition were designed through the change of the content of SiO₂ which was formed by the oxidation at 800°C in air. Porous Si₃N₄ with different phase compositions was obtained after sintering at 1800°C in N₂ atmosphere. A small content of SiO₂ favored the formation of secondary phase Lu₄Si₂O₇N₂, while large content of SiO₂ favored the formation of secondary phase Lu₂Si₂O₇ and Si₂N₂O. Porous Si3N4 ceramics with secondary phase Lu₄Si₂O₇N₂ had a flexural strength of 207 MPa, while that with secondary phase Si₂N₂O and Lu₂Si₂O₇ had lower flexural strength.

关键词: Porous silicon nitride ceramics

Lu2O3和Lu2O3∶Eu3+单分散球形粉体合成及其荧光性能研究

马畅 , 李晓东 , 董宇 , 刘绍宏 , 朱琦 , 李继光 , 霍地 , 孙旭东

中国稀土学报 doi:10.11785/S1000-4343.20130411

以Lu(NO3)3和尿素为原料,采用均相沉淀法合成镥盐前驱体,研究Lu3+浓度、尿素/Lu3+摩尔比R对前驱体形貌的影响.结果表明,在反应温度为95℃时,低Lu3+浓度有利于单分散球形粉体的合成,并且适当的调整R值可将单分散球形颗粒尺寸控制在180 ～ 270 nm之间.在此基础之上,研究Eu3+掺杂Lu2O3单分散球形荧光粉体的合成,探讨了Eu3+的掺杂量(1％,3％,5％,7％,9％(原子分数))及煅烧温度(600～ 1200℃)对颗粒形貌及其荧光性能的影响.结果表明,Eu3+的掺杂使所得(Lu,Eu)盐前驱体颗粒尺寸远小于单纯的Lu盐前驱体,且Eu含量对荧光粉的荧光强度有着显著的影响,荧光淬灭浓度为5％.在考察的煅烧温度范围内,荧光粉的荧光强度随煅烧温度的提升而增强.

关键词: Lu2O3 , Eu3+ , 均相沉淀 , 单分散球形 , 前驱体 , 荧光性能 , 稀土

Ferroelectricity and ferromagnetism of La(0.5)Lu(0.5)Ni(0.5)Mn(0.5)O(3) thin films on Nb:SrTiO(3) substrates

Journal of Physics-Condensed Matter

Epitaxial orthorhombic La(0.5)Lu(0.5)Ni(0.5)Mn(0.5)O(3) (LLNMO) thin films deposited on Nb:SrTiO(3) (NSTO) substrates are prepared by pulsed laser deposition and their ferroelectricity and magnetism are investigated using various techniques. It is revealed that the as-prepared thin films are ferromagnetic (FM) insulators. The FM transition occurring at similar to 125 K is evidenced by the well defined hysteresis at low temperature, with a saturated magnetic moment as high as 1.8 mu(B)/f.u. at similar to 5 K. A reversible ferroelectric polarization of similar to 0.2 mu C cm(-2) below similar to 140 K is also observed. The magnetism can be understood by the FM ordering associated with a partially ordered major Ni(2+)-Mn(4+) plus minor Mn(3+)-Ni(3+) configuration, while the ferroelectricity is argued to originate from the A-site disordering of La(3+) and Lu(3+).

关键词: x-ray photoelectron;perovskites;la2nimno6;nickel

溶剂热法制备不同形貌纳米Lu2O3粉体

邱华军 , 施鹰 , 谢建军 , 谢杰

人工晶体学报

本文以水、丙酮、乙醇、乙二醇为溶剂,采用溶剂热法制备了不同形貌的纳米氧化镥(Lu2O3粉)粉体前驱体,将前驱体在400～800 ℃条件下煅烧2 h制得了不同形貌的Eu3+:Lu2O3粉体.研究发现,所用溶剂的物理性质对产生特定形貌的样品具有重要的影响,以水和丙酮为溶剂,可制得具有较高长径比的Lu2O3纳米棒,而当溶剂为乙醇和乙二醇时,所得Lu2O3粉体为等轴状的纳米颗粒.

关键词: 溶剂热法 , 氧化镥 , 纳米粉体 , 形貌

R2O-RO-Al2O3-SiO2-P2O5系分相/析晶乳浊釉乳浊粒子的形成机理

武秀兰 , 任强 , 王芬

硅酸盐通报 doi:10.3969/j.issn.1001-1625.2006.01.008

在普通石灰碱釉的基础上引入骨粉和滑石,形成R2O-RO-Al2O3-SiO2-P2O5系统釉料,通过调整釉料的化学组成获得分相/析晶乳浊釉.利用XRD,SEM,EDS等测试技术,研究了SiO2与P2O5和SiO2与MgO的摩尔比与釉层显微结构的关系,分析了乳浊粒子(玻璃液滴和微晶)的形成机理.

关键词: 乳浊釉 , 分相 , 析晶 , 机理

Fabrication of Porous Si₃N₄-Lu₂Si₂O₇ Composite Ceramics

Pengfei Zhang Litong Zhang Xiaowei Yin

材料科学技术（英文）

To improve the corrosion resistance of porous Si₃N₄ used in the high temperature environments, which contain water vapor and volatile species, porous Si₃N₄-Lu2Si₂O₇ composite ceramics were fabricated by a process of oxidation bonding and pressureless sintering in flowing N₂ atmosphere at the temperatures lower than 1550°C. The pores in ceramics were formed by removing the pore-forming agent (phenolic resin). SiO₂ derived by the oxidation of Si₃N₄ at 1250°C in air reacted with Lu₂O₃ at various sintering temperatures, leading to the formation of Lu₂Si₂O₇ with excellent oxidation and corrosion resistance. The phase composition, microstructure, and mechanical properties of the porous ceramics depended on the sintering temperatures. Si₃N₄-Lu2Si₂O₇ composite ceramics with the porosity of 52% and the pore size of 0.2μm were obtained by oxidation bonding at 1250°C for 1 h and pressureless sintering at 1550°C for 2 h using 4 wt pct Lu₂O₃ additive.

关键词: Porous ceramics , 氮化硅 , 焦硅酸镥 , 无压烧结