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Crystal habit for upconversion laser crystal of BaY2F8
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来源: 《Journal of Rare Earths2008年第4期》——李广慧 阮永丰 张守超 孙伟
Crystal habit for upconversion laser crystal of BaY2F8李广慧,阮永丰,张守超,孙伟摘 要:BaY2F8 crystals had a relatively low symmetry, and its XRD data showed that those strong diffractions occurred in a narrow angle range, so it was difficult to orientate the single crystals of BaY2F8. In this paper, based on the structure characteristics and XRD data, the crystal......
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Mechanochemical synthesis of cerium orthophosphate
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来源: 《Journal of Rare Earths2009年第4期》——A.Matraszek I.Szczygie L.Macalik J.Hanuza
in rhabdophane-type structure. It converted to monazite (monoclinic symmetry) during heating at the temperatures of above 600 oC. Oxidation of Ce3+ to Ce4+ was avoided during the syntheses, as confirmed......
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Crystal-field analyses for trivalent lanthanide ions in LiYF4
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来源: 《Journal of Rare Earths2016年第10期》——程军 闻军 陈永虎 尹民 段昌奎
systematically analyzed. The results revealed that the regular variation trends of the major parameters at relatively low site symmetry still existed. The g factors of ground states were calculated using......
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Electronic structure and properties of FeS2 with the space groups of Pa3 and P1
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来源: 《International Journal of Minerals Metallurgy and Materials2013年第7期》——Cui-hua Zhao Bo-zeng Wu Jian-hua Chen Yu-qiong Li Ye Chen
of optical absorption of P1 are larger than those of Pa3. These behaviors are attributed to the differences in symmetry, atomic arrangement, and Mulliken bond population of each unit for Pa3 and P1......
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Crystallite Orientation Analysis for a Multidirectionally Cold Rolled α-Ti Alloy (TA7) Thin Sheet
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来源: 《Rare Metals1989年第2期》——Zuo Liang Liang Zhide Xu Jiazhen Zhao Xiang Department of Materials Science and Engineering,Northeast University of Technology,Shenyang,China
) and inverse pole figures ofhexagonal materials with or without orthorhombic physical symmetry has been worked out the first time.The texturemeasurements and the ODF calculations were performed......
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Modified phase transition and electrical properties of [Li0.05(Na0.535K0.48)0.95]- (Nb0.94Sb0.06)O3 lead-free piezoelectric ceramic by sintering temperature
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来源: 《Rare Metals2012年第6期》——ZHAO Xiaokuna, ZHANG Bopinga, ZHAO Leia, ZHU Lifenga, LI Yana, and CHENG Liqianb a School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing , China b State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing , China
on the influence of the sintering temperature. A polymorphic phase transition (PPT) from orthorhombic to tetragonal symmetry was observed when the sintering temperature was raised from 1040 to 1050......
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Characterization and growth dynamics of barium titanate crystallite on nanometer scale
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来源: 《International Journal of Minerals Metallurgy and Materials2005年第1期》——Sen Wang, Yue Zhang, Zhen Ji, Yousong Gu, Yunhua Huang, and Cheng ZhouDepartment of Materials Physics, University of Science and Technology Beijing, Beijing , China
(X-ray powder diffractometer) at different heat treatment temperatures. The results show that amorphous barium titanate powder can transfer into tetragonal symmetry structure after heat treatment......
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Dissymmetric flow phenomenon in a multistrand tundish
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来源: 《International Journal of Minerals Metallurgy and Materials2007年第6期》——Mingmei Zhu, Guanghua Wen, Ping Tang, and Yufeng Wang College of Material Science and Engineering, Chongqing University, Chongqing , China
temperature field, simultaneously, the symmetry of the average residence time and the fluid flow pattern has improved, and the fluid flow in the tundish has been more reasonable. In case of a symmetric......
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Influence of sintering temperature on the structure and piezoelectric properties of ZnO-modified (Li, Na, K)NbO3 lead-free ceramics
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来源: 《International Journal of Minerals Metallurgy and Materials2012年第9期》——Hai-tao Li , ) , Bo-ping Zhang ) , Wei-gang Yang ) , and Nan Ma ) ) School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang , China ) School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing , China
with the mechanical quality factor decreasing from 228 to 192. A phase transition from tetragonal to orthorhombic symmetry was identified by XRD analysis, and the corresponding calculation of lattice parameters......
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高效液相色谱法测定水产品中7种兽药残留量
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来源: 《理化检验-化学分册2012年第5期》——孟勇 张美琴 王静 谭秀慧 吴光红
高效液相色谱法测定水产品中7种兽药残留量孟勇1,张美琴1,王静2,谭秀慧2,吴光红1,21. 农业部渔业产品质量监督检验测试中心2. 江苏省水产质量检测中心摘 要:提出了高效液相色谱法同时测定水产品中呋喃唑酮,噁喹酸,萘啶酸及4种磺胺类药物等7种兽药残留量的方法.样品经乙腈提取,正己烷脱脂,用中性氧化铝柱和C18固相萃取柱进行分离及净化.以Symmetry C18色谱柱为分离柱,以不同体积比混合的乙腈与0.08mol.L-1乙酸溶液为流动相进行梯度洗脱,紫外检测器于波长265nm处检测.7种兽药的质量浓度与其峰面积均在0.05~1.0mg.L-1范围内呈线性关系,检出限(3S/N)为0.01~0.04mg.kg-1.方法的回收率在68.2%~97.3%之间,相对标准偏差(n=6)在1.6%~14%之间......