Xinguo ZHAO
,
Zhidong ZHANG
,
Zhijun GUO
,
Wei LIU
,
Dianyu GENG
,
Baozhi CUI
材料科学技术（英文）
The alloy with nominal composition Sm-2(Fe0.94Ti0.06)(l7) is prepared by are-melting, hydrogenation and nitrogenation processes. The Sm-2(Fe0.94Ti0.06)(17) alloy has a single phase of Sm-3(Fe, Ti)(29) with the Nd-3(Fe, Ti)(29)-type structure. The corresponding hydride phase with the same phase structure of the parent alloy was formed after a hydrogen decrepitation (HD) process at 300 degrees C. The hydrogenation at 800 degrees C mainly shows a HDDR process. The HD and nitrogenation at 500 degrees C result in increasing the Curie temperature of the alloy by 72 degrees C and by 158 degrees C due to lattice expansions, respectively. The anisotropic and isotropic Sm-3(Fe, Ti)(29)Ny magnets are obtained after HD, HDDR and the consequent nitrogenation, respectively. The optimum magnetic properties of Sm-3(Fe, Ti)(29)Ny powders achieved in the above two processes are: (i) B-r=0.82 T, H-i(c)=4.48 kA/cm, (BH)(max)=54.3 kJ/m(3), (ii) B-r=0.68 T, H-i(c)=8.14 kA/cm, (BH)(max)=66.4 kJ/m(3).
关键词:
Dianyu GENG
,
Zhidong ZHANG
,
Baozhi CUI
,
Zhijun GUO
,
Wei LIU
,
Xinguo ZHAO
材料科学技术（英文）
The structure and magnetic properties of SmyFe(100-1.5)yC(0.5y)(y=8 similar to 20) alloys prepared by mechanical alloying (MA) from Sm, Fe and graphite have been investigated systematically. In order to improve hard magnetic properties of the alloys prepared by mechanical alloying, a new method consisting of re-milling and re-annealing was developed. After being re-milled and re-annealed, the Curie temperature T-C of the Sm-Fe-C alloys changes. The T-C of 2:17 phase increases, whereas the T-C of 2:14:1 phase decreases. After being re-annealed at low temperatures, the grain sizes of hard phases are smaller than those in the alloys annealed at high temperatures. The effects of Co or Ti substitution for Fe are studied.
关键词:
Jian ZHANG
,
Xiaokai SUN
,
Wei LIU
,
Baozhi CUI
,
Xinguo ZHAO
,
Zhidong ZHANG
材料科学技术（英文）
Structure and magnetic properties of the nanocomposite magnets prepared by mechanical alloying procedure with composition 55 wt pct Nd (Fe0.92B0.08)5.5+45 wt pct a-Fe, 55 wt pct Nd(Fe0.8-xCo0.12Nbx B0.08)5.5+45 wt pct a-Fe (x=0.00, 0.01, 0.03) and 55 wt pct (Nd0.9Dy0.1) (Fe0.77Co0.12Nb0.03B0.08)5.5+45 wt pct a-Fe were studied. It was found that substitution of Co for Fe could significantly improve the permanent magnetic properties of the nanocomposite magnets and typically, the maximum magnetic energy product was increased from 104.8 kJ/m3 (13.1 MGOe) to 141.6 kJ/m3 (17.7 MGOe). In contrast to the case of conventional nominally single-phase magnets, the addition of Nb results in promoting the growth of a-Fe grain and is thus unfavorable for the improvement of permanent magnetic properties of the nanocomposites. Although the addition of Dy can increase the coercivity of the magnets, the increase of magnetic anisotropy of hard phase leads to decrease of the critical grain size of soft phase. Additionally it causes the difficulty of preparing the nanocomposites because it is more difficult to control the grain size of soft phase to meet the requirement of appropriate exchange coupling between hard and soft grains.
关键词:
陈玮
,
程继健
无机材料学报
doi:10.3321/j.issn:1000-324X.1999.01.004
为了探索新的透红外材料,本文研究了As2Se3-AsTe-CuI系统玻璃的形成区,制备了一系列不同AsTe和CuI含量的玻璃. 研究表明:该系统玻璃的形成范围相当大,As2Se3-AsTe二元系统可以任何比例形成玻璃,As2Se3-CuI和AsTe-CuI二元系统, 当CuI含量分别达70和40mol%时,仍可形成稳定的玻璃, 直径在20mm厚度在50mm以上的玻璃样品很容易得到. 研究了部分玻璃样品的远红外光谱,结果表明:该系统玻璃的结构单元主要是:[As(SeTe)3-xIx] (x=0～3)、[As2Te4]和[CuI4],随玻璃的成分不同,这些结构单元的相对比例也不同,根据研究结果提出了该系统玻璃的结构模型.
关键词:
硫系卤化物玻璃
,
玻璃形成
,
玻璃结构
,
红外透射材料
刘丽红
,
胡志强
,
张晨宁
,
高岩
,
卢珊珊
功能材料与器件学报
doi:10.3969/j.issn.1007-4252.2006.06.012
应用浸渍涂膜法制备了CuI固体电解质薄膜,组装了DSSC电池.用扫描电镜观察了CuI薄膜的表面形貌,四探针电阻仪测定了CuI薄膜的电阻率,XJCM-8太阳电池测试仪测试了DSSC电池的性能结果表明:添加适量的离子液体可以有效地抑制CuI晶粒的生长;提高CuI晶粒与多孔TiO2薄膜孔径尺寸的相配度;减小CuI薄膜的电阻率.这些都是影响CuI固体电解质色素增感太阳能电池性能及稳定性的重要因素.
关键词:
TiO2薄膜
,
离子液体
,
CuI固体电解质
,
色素增感太阳能电池
刘飞
,
祝博
,
王晓丹
,
曹建新
人工晶体学报
以粗碘和硫酸铜为原料,水合肼为还原剂,利用液相法和微乳液法合成了不同晶形γ-CuI晶体.采用XRD和SEM研究了液相法和微乳液工艺技术条件对合成γ-CuI微观结构的影响,分析了具有不同微观结构γ-CuI对其导电性能的影响.结果表明,分别以聚乙二醇(PEG-6000)和柠檬酸为表面活性剂,采用液相法常温下500 r/min反应30 min可制备出纳米球形和三角锥形γ-CuI.按CTAB-正戊醇-环己烷-水配比3∶3∶7∶10分别配制硫酸铜和碘化铵微乳液,常温下500 r/min反应2h可制备出六边形薄片状γ-CuI.不同微观形貌和粒径分布对γ-CuI产品电导率具有较大的影响.纳米球形γ-CuI电导率最小,为4.9 Ω·cm.
关键词:
γ-CuI晶体
,
电导率
,
液相法
,
微乳液法
陈玮
,
程继健
无机材料学报
为了探索新的透红外材料，本文研究了As2
Se3－AsTe－CuI系统玻璃的形成区，制备了一系列不同ASTe和CuI含量的玻璃．研究表明：该系统玻璃的形成范围相当大，AS2Se3－ASTe二元系统可以任何比例形成玻璃，AS2Se3－CuI和AsTe-CuI二元系统，当CSI含量分别达70和40mol％时，仍可形成稳定的玻璃，直径在20mm厚度在50mm以上的玻璃样品很容易得到．研究了部分玻璃样品的远红外光谱，结果表明：该系统玻璃的结构单元主要是：［AS（SeTe）3-xIx］（x＝0～3）、［As2Te4］和［CuI4］，随玻璃的成分不同，这些结构单元的相对比例也不同，根据研究结果提出了该系统玻璃的结构模型．
关键词:
硫系卤化物玻璃
,
null
,
null
,
null
刘飞
,
祝博
,
王晓丹
,
曹建新
材料导报
以粗碘和硫酸铜为原料,水合肼为还原剂,利用微乳液法合成了六边形薄片状γ-CuI晶体.采用XRD和SEM手段研究了微乳液工艺技术条件对合成γ-CuI晶相组成和微观形貌的影响.结果表明,表面活性剂CTAB用量、水含量和反应物浓度对微乳液法制备的γ-CuI晶相组成和晶体形状没有太大影响,但对晶体尺寸具有较大影响.适宜的微乳液制备工艺条件能产生适当的界面膜强度,有效控制碘化压铜晶体尺寸.CTAB-正戊醇-环己烷-水体积比为3∶3∶7∶10,硫酸铜溶液0.1mol/L和碘化铵溶液0.2mol/L,常温下500r/min搅拌2h合成产物为六边形薄片状γ-CuI.
关键词:
γ-CuI微乳液法
,
六边形薄片状
,
晶体尺寸
,
微观形貌
王钦忠
,
汪正浩
应用化学
doi:10.3969/j.issn.1000-0518.2006.10.020
用简单的电化学方法制备出了机械性能较强的CuI半导体膜,这种半导体膜是由大量的三角形片状微粒组成的. 利用交流阻抗方法在pH值分别为0、2、4和7的0.5 mol/L Na2SO4溶液中研究了这种膜电极的电化学性质. 研究发现,溶液pH值对CuI半导体膜的阻抗有较大的影响,pH值越小则电化学反应电阻就越大;同时,溶液的pH值也对CuI半导体膜电极的表面态有着较大的影响,pH值越大表面态密度越大. 在pH值为0的Na2SO4溶液中测得CuI半导体的Efb为0.023 V(vs.SCE).
关键词:
CuI半导体
,
交流阻抗
,
平带电位
