材料期刊网

Low Temperature Thermodynamic Study of the Stable and Metastable Phases of Silver

X.B. Li , Y.Q. Xie , Y.Z. Nie , H.J. Peng , null , null

金属学报(英文版)

The low temperature thermodynamics of the stable phase of silver was assessed by the polynomial model and Debye model from the experimental data available in the literature. By means of the constrained non-linear least squares curve fitting arithmetic, two sets of parameter values were determined. The expression of the thermodynamic functions cp(T) and G(T)-H (298.15K) at 0-298.15K were presented. Only the low temperature thermodynamics of the metastable phase of silver can be extrapolated by the Debye model. The expression of the thermodynamic functions cp(T) at 0-298.15K was presented.

关键词: silver , null , null

SOFC阴极材料(La_(0.85)Sr_(0.15))_y(Mn_(1-z)Cr_z)O_3的物理性能和化学稳定性

杨威 , 隋智通

材料研究学报

采用烧结法制备阴极材料(La0.85Sr0.15)y(Mn1z-Crz)O3(y=0.85;1;z=0.1,0.2).研究了多孔锰酸镧与致密ZrO2(8mol%Y2O3)界面的成分变化和显微形貌(La0.85Sr0.15)(Mn0.9Cr0.1)O3呈现高电子电导率、良好的热膨胀系数匹配和化学稳定性而(La0.85Sr0.15)MnO3未起到阻止界面退化的作用在1300～1500℃范围内Mn、La、Zr和Sr发生扩散,其中Mn的扩散明显

关键词: SOFC , lathanum manganite. chemical stability , thermal expansion , conductivity , null

新型SOFC阳极材料La0.7Sr0.3Cr0.5-yMn0.5-zCo(y+z)O3的制备和性能表征

何恩全 , 马文会 , 刘荣辉 , 于洁 , 戴永年

稀有金属 doi:10.3969/j.issn.0258-7076.2007.04.019

采用了甘氨酸-硝酸盐法制备了La0.7Sr0.3Cr0.5-yMn0.5-zCo(y+z)O3(y, z=0.1, 0.2)系列阳极材料.借助XRD, SEM对所制备的材料进行了物相和形貌分析.XRD表明利用GNP法制得的粉体在1350 ℃烧结5 h可以形成完整的钙钛矿相;SEM分析可知所得物料颗粒呈球状,尺寸约为1 μm,且没有团聚现象.同时,XRD显示La0.7Sr0.3Cr0.5Mn0.4Co0.1O3和La0.9Sr0.1Ga0.8Mg0.2O3电解质之间具有较好的化学相容性.采用直流四探针法测试了不同组成材料在250～800 ℃温度范围内在空气中的电导率,发现该系列材料在该温度段范围符合小极化子导电机制.另外,利用直流四探针法测试了La0.7Sr0.3Cr0.5Mn0.4Co0.1O3在不同还原气氛下的电导率,在CH4和H2气氛中,La0.7Sr0.3Cr0.5Mn0.4Co0.1O3最大电导率分别达到了4.5和0.42 S·cm-1.

关键词: 钙钛矿 , 阳极 , 电导率

直流磁场对Mg-Y-C u-Z r合金结晶取向和性能的影响?

黄曼青 , 周全 , 刘峰 , 黄金角

材料导报 doi:10.11896/j.issn.1005-023X.2016.22.010

研究了0~1.4 T的直流磁场对陶瓷型铸造 Mg-Y-Cu-Zr 合金结晶取向和力学性能的影响。结果表明直流磁场对合金的初生相没有明显影响，但磁场强度大于1.12 T时，合金第二相的分布变得不连续。当磁场强度小于0.84 T时，α-Mg在(002)面的衍射峰逐渐增强，但变化不明显；当磁场强度大于0.84 T 时，α-Mg 基体在(002)、(101)面的衍射峰强度明显减弱，而在(100)晶面衍射峰强度有所增强。磁场处理后，合金的综合力学性能得到了改善；当磁场强度为1.4 T 时，其抗拉强度和伸长率最高，分别为237 MPa 和8.5%，较无磁场处理时分别提高了38.6%和33.4%。

关键词: 直流磁场 , Mg-Y-Cu-Zr合金 , 结晶取向 , 力学性能

X Y Z particles at BABAR

中国物理C

关键词:

奇Z超重核的禁戒α衰变

许昌 , 任中洲

原子核物理评论 doi:10.11804/NuclPhysRev.30.03.308

采用密度依赖的结团模型研究了奇Z超重核的禁戒α衰变,α粒子与子核之间的微观核势通过双折叠模型对M3Y核子-核子相互作用势以及α粒子与子核的密度积分给出.α粒子与子核之间的库仑相互作用也通过α粒子与子核的电荷密度积分给出.计算发现,由于非零角动量带来的禁戒效应和小的α粒子预形成几率,奇Z超重核的α衰变寿命会明显变长.

关键词: α衰变 , 超重核 , 结团模型

A Hydrogen Sensor Using SrCe_0:95Yb_0:05O_3-α as Proton Conductor and YH_x+Y H_2-z as Reference Electrode for Determining Hydrogen Pressure in Solid Steel

Ying Liy Changzhen Wang Zhongli Zhang Jiangxin Wang

材料科学技术（英文）

The steel contains a small amount of hydrogen which will escape during the heat treatment. The hydrogen pressure in 16MnRE steel was investigated with a hydrogen sensor, which used SrCe_0:95Yb_0:05O_3-α proton conductor as a solid electrolyte, YH_x+YH_2-z as a solid state reference electrode and Ni wire as electrode constructing a hydrogen concentration cell, shown as Ni|_YH_x+YH_2-z |SrCe_0:95Yb_0:05O_3-α |[H]_steel |Ni. The response time of sensor is less than 10 s. The relational expression of hydrogen partial pressure with temperatures was determined using two shape proton conductors. The results showed the regularity in experimental temperature range, and the hydrogen partial pressure increased as its temperature was raised.

关键词: Hydrogen sensor , Proton conductor , Solid electrolyte

Z-pin的拔出强度试验研究

王晓旭 , 陈利

材料工程 doi:10.3969/j.issn.1001-4381.2011.11.001

通过单根Z-pin从复合材料层合板中拔出的试验方法,测试了Z-pin的拔出强度,计算了Z-pin的临界埋入深度,并引入抗拉强度利用率概念来表征Z-pin的抗拉强度在拔出过程中的利用程度.结果表明,直径0.50mm和0.28mm的Z-pin临界埋入深度分别约为5.1mm和3.1mm.当Z-pin的埋入深度小于临界埋入深度时,Z-pin从层板中拔出；Z-pin拔出强度与埋入深度成正比,与Z-pin的直径成反比；当Z-pin的埋入深度大于临界埋入深度时,Z-pin发生断裂,Z-pin的抗拉强度利用率达到100％.最后提出了提高抗拉强度利用率的建议.

关键词: Z-pin , 拔出强度 , 复合材料 , 拔出试验 , 抗拉强度

Study of properties of mixed ferro-ferrimagnetic ising compounds with (A(x)B(1-x))(y)C

Communications in Theoretical Physics

The magnetic properties of the mixed ferro-ferrimagnetic compounds with (A(x)B(1-x))(y)C-z where A(z) B-z and C are three different magnetic ions and form three different sublattices, are studied by using the standard mean-field theory. The phase diagram which is related to experimental work of molecule-based ferro-ferrimagnet ((NixMn1-xII)-Mn-II)(1.5)[Cr-III(CN)(6)].zH(2)O is obtained. The magnetization curves(z) internal energy(z) and specific heat of the same mixed (A(x)B(1-x))(y)C system are also investigated.

关键词: mixed ferro-ferrimagnet;Ising model;phase diagram;internal energy;specific heat;mean-field analysis;magnetic-properties;prussian blue;alloy

共沉淀法制备Co2-Z型铁氧体形成动力学过程研究

王琦 , 官建国 , 刘飚 , 张清杰

硅酸盐通报 doi:10.3969/j.issn.1001-1625.2004.03.004

用化学共沉淀法制备得到了Z型六角铁氧体,并研究了它的动力学过程;详细讨论了煅烧制度,如煅烧温度、升温速率和却冷方式对最终产物晶体结构的影响.研究表明:Co2-Z型六角铁氧体的生成序为:Ba-M→Ba-M + Co2-Y→Co2-Z;在1200℃下煅烧4h,可获得以Co2-Z为主晶相的铁氧体材料;升温速率及冷却速率对晶体的形成与结构有影响,快速升温影响最为明显.

关键词: 共沉淀 , Co2-Z型六角铁氧体 , 动力学