Author C.D. Zhou1
,
2)
,
J.X. Yu1)
,
X.P. Dong1)
,
Y.H. Zhang1)
,
C.Q. Sun3) and T.F. Li4) 1) The State Education Commission Open Research Laboratory for High Temperature Materials and Testing
,
Shanghai Jiao Tong University
,
Shanghai 200030
,
China2) Shanghai Enhanced Lab of Ferrometallurgy
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Shanghai University
,
Shanghai 200072
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China3) Institute of Aeronautical Materials
,
Beijing 100095
,
China 4) Institute of Corrosion and Protection of Metals
,
The Chinese Academy of Sciences
,
Shenyang 110015
,
ChinaManuscript received 18 October 1998
金属学报(英文版)
An investigation has been made on the tensile fracture behavior of oriented single crystal DD100 superalloy at 850. The appearance of the fracture surface of DD100 reflects the glide plane decohension fracture mechanism, which is different from the fracture of oriented DD100. The tensile strength and elongation are lower than the oriented DD100. Oxygen in air has little effect on the strength of DD100 but reduces the tensile elongation obviously. Oxygen does not affect the fracture mode of DD100 but strongly accelerates the process of fracture.
关键词:
single crystal superalloy
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null
,
null
Physica Status Solidi a-Applications and Materials Science
In MnAs(1-x)P(x) compounds (x = 0.006 and 0.01), prepared by mechanical alloying, the thermal hysteresis is greatly reduced from about 10-30K in MnAs-based compounds, prepared by conventional melting, to 2K for x = 0.01 (or 4K for x = 0.006). Such obvious hysteretic reduction is ascribed to the grain-size effect, largely due to the preparation method of mechanical alloying. Meanwhile, a maximum value of the magnetic-entropy change Delta S(M) of 11.3 J/kgK for a field change of 2 T is obtained at 294.5K for MnAs(0.994)P(0.006). The study on the MnAs(1-x)P(x) system and also the effect of the preparation technology may be beneficial for the realization of magnetic refrigerants for application at room temperature. (C) 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
关键词:
magnetocaloric effect;mechanical alloying;thermal hysteresis;gd-5(si2ge2);transition;mnas
Y.X.Li
,
G.Z.Xu
,
J.P.Qu
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F.G.Liu and B.W.Wang Hebei University of Technology
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Tianjin 300130
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China C.C.Tang.G.H.Wu and W.S.Zhan State Key Laboratory for Magnetism
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Institute of Physics
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CAS
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Beijing 100080
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China C.Zhao Tianjin University
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Tianjin 300072
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China S.X.Gao Hebei Normal University
,
Shijiazhuang 050091
,
China
金属学报(英文版)
The synthesis and magnetic properties of Pr xCe 1 x Fe 2 have been investigated. The forma tion of Pr xCe 1 x Fe 2 is found to depend strongly on annealing temperature. Pure single phase compound can be synthesized at ambient pressure when x≤0 5. The main phase of the Laves structure can still be observed up to x=0 8. Magnetostriction increases with in creasing x and a largest saturation magnetostriction 200 ppm is observed for x=0.5.
关键词:
magnetostriction
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null
,
null
姜斌
,
房明浩
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彭鹏
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卫礼贤
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黄朝晖
,
刘艳改
稀有金属材料与工程
以SrCO_3、SiO_2、ZrO_2和(NH_4)H_2PO_4为实验原料,采用固相反应法制备出磷酸盐Sr_(1+x)Zr_4P_(6-2x)Si_(2x)O_(24)(x=0～0.4)粉体.XRD和SEM分析表明:在1100 ℃,4 h温度下煅烧能够合成单相Sr_(1+x)Zr_4P_(6-2x)Si_(2x)O_(24)(x=0～0.4)粉体,1100 ℃,4 h条件下制备的Sr_(1+x)Zr_4P_(6-2x)Si_(2x)O_(24)(x=0～0.4)粉体成球状,平均粒径在300～500 nm之间.在1100 ℃煅烧温度下适当延长保温时间,有利于Sr_(1+x)Zr_4P_(6-2x)Si_(2x)O_(24)(x=0～0.4)单相粉体的形成.
关键词:
Sr_(1+x)Zr_4P_(6-2x)Si_(2x)O_(24)
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固相反应法
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热膨胀系数
吕毅军
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高玉琳
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郑健生
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李志锋
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蔡炜颖
,
王晓光
功能材料与器件学报
doi:10.3969/j.issn.1007-4252.2000.04.024
测量了室温下三元GaxIn1-xP (x=0.48)和四元(AlxGa1-x)0.51In0.49P (x=0.29)合金背散射配置下的喇曼光谱. 三元GaxIn1-xP的喇曼谱表现为双模形式, 在DALA带上叠加了FLA模, 在有序样品中观察到了类GaP的TO1模和类InP的TO2模, 类GaP的LO1模和类InP的LO2模的分裂, 表示有序度的b/a比从无序样品的0.40变化到有序样品的0.10, 有序样品b/a比的降低是由于TO1模和LO1模分裂的影响所造成的. 四元(AlxGa1-x)0.51In0.49P为三模形式, 观察到了双峰结构的FLA模, 由于Al组分的影响, 类GaP的LO模成了类InP的LO模的肩峰. 所有模式与经验公式吻合得很好.
关键词:
喇曼谱
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有序化
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Ⅲ-Ⅴ族半导体
李妮
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黄维刚
功能材料
以乙二胺四乙酸（EDTA）为模板剂,采用水热法,成功地合成一系列具有较大长径比的一维GdV1-xPxO4∶Tm蓝色纳米荧光粉。利用X射线衍射仪、扫描电镜、荧光光谱仪对产物的相结构、形貌和发光性能进行了分析。结果表明所得产物均具有明显的一维特征,随P含量的增加,产物的长径比增加,纳米棒逐渐变细。产物在未经焙烧的条件下,在278nm波长紫外光激发下发出强度较高的波长为478nm的明亮蓝光,掺P摩尔比,即x=0.4时,所得产物的发光强度最好。
关键词:
一维
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GdV1-xPxO4∶Tm
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发光
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稀土
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水热法
杨恭辉
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丁伟中
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吴成章
,
刘银河
,
张星星
功能材料
doi:10.3969/j.issn.1001-9731.2016.01.029
利用固相合成法制备了P掺杂的BaCo-NbO3-δ钙钛矿透氧膜片,研究了P掺杂对该透氧膜材料透氧率及稳定性的影响.在850℃下,BCN膜在透氧过程中有部分六方相生成,造成其透氧量急剧衰减,其透氧稳定性较差.掺杂P后,尽管初始透氧量有所下降,但其稳定性得到了一定程度的改善,在850℃下透氧50 h后,BCNP0.03的透氧量仅下降约5％,仍可达到1.5 mL/(cm2·min).XRD、TPD及热分析结果表明,P掺杂后抑制了材料中晶格氧的脱附,提高了相结构稳定性.
关键词:
透氧膜
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P掺杂
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钙钛矿
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透氧率
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稳定性
材料科学技术（英文）
The structure, specific heat, magnetic and electrical properties of MnTe(1-x)Sb(x) (x=0, 0.1, 0.15, 0.2 and 0.25) alloys have been investigated. The MnTe(1-x)Sb(x) alloys crystallize in a hexagonal NiAs-type structure, and the impurity of MnSb phase appears when x >= 0.15. The MnTe(0.9)Sb(0.1) compound exhibits ferrimagnetic behavior with hysteresis loops even at 350 K, showing that the magnetic properties of MnTe compound are very sensitive to little compositional change. The ferromagnetism in the MnTe(1-x)Sb(x) alloys with higher Sb contents may be attributed to the impurity of MnSb phase. Energy dispersive X-ray spectroscopy analysis on the MnTe(0.9)Sb(0.1) compound indicates that Sb is very difficult to dope into the lattice of MnTe. So the anomaly of resistivity at 300 K of MnTe(0.9)Sb(0.1) and the peak of specific heat around 304 K of all the alloys are thought to be related with the antiferromagnetic interactions of MnTe-based lattice.
关键词:
Electronic transport property;Hysteresis loop;Specific heat;manganese telluride;semiconductors;ferromagnetism;scattering;exchange
