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| 1 | Crystalline phase of Y_2O_3 :Eu particles generated in a substrate-free flame process显示文摘In this study, factors affecting the crystal structure of flame-synthesized Y 2 O 3 :Eu particles were inves- tigated, especially the particle size effect and its interaction with Eu doping concentration. Polydisperse Y 2 O 3 :Eu (size range 200 nm to 3 m) powder samples with Eu doping concentrations from 2.5 mol% to 25 mol% were generated in either H 2 /air or H 2 /O 2 substrate-free flames. The crystal structure of the powder samples was determined by powder X-ray diffraction (XRD), which was complemented by pho- toluminescence (PL) measurements. Single particle crystal structure was determined by single particle selected area electron diffraction (SAED), and for the first time, by electron backscatter diffraction (EBSD). H 2 /air flames resulted in cubic phase Y 2 O 3 :Eu particles with hollow morphology and irregular shapes. Particles from H 2 /O 2 flames had dense and spherical morphology; samples with lower Eu doping concen- trations had mixed cubic/monoclinic phases; samples with the highest Eu doping concentrations were phase-pure monoclinic. For samples generated from H 2 /O 2 flames, a particle size effect and its interaction with Eu doping concentration were found: particles smaller than a critical diameter had the monoclinic phase, and this critical diameter increased with increasing Eu doping concentration. These findings sug- gest that the formation of monoclinic Y 2 O 3 :Eu is inevitable when extremely hot substrate-free flames are used, because typical flame-synthesized Y 2 O 3 :Eu particle sizes are well below the critical diameter. However, it may be possible to generate particles with dense, spherical morphology and the desired cubic structure by using a moderately high flame temperature that enables fast sintering without melting the particles. | Bing Guoa Hoon Yim Wonjoong Hwang Matt Nowell Zhiping Luo | 2011 | Particuology2011，9，1： | 4 |
| 2 | Gaultherins A and B,two lignans from Gaultheria yunnanensis显示文摘 | Zhizhen Zhanga Dean Guoa Changling Lia | 1999 | Phytochemistry1999，51，： | 1 |
| 3 | 1-Butene isomerization over aluminphosphate molecular sieves and zeolites 显示文摘 | Yang Szeming Lina Jauyih Guoa Darhan | 1999 | Appl Catal A : Gen1999，181，1： | 1 |
| 4 | What is Important in the Simulation of Spray Dryer Performance and How Do Current CFD Models Perform 显示文摘 | FLETCHERA D F GUOA B HARVIEB D J E | 2006 | Applied Mathematical Modelling2006，30，： | 1 |
| 5 | Mulii-objective optimal PMU placement using a non-dominated sorting differential evolution algorithm显示文摘 | Peng C Sun H Guoa J | 2010 | International Journal of Electric Power Energy System2010，32，8： | 1 |
| 6 | 1-Butene isomerization over aluminophosphate molecular sieves and zeolites 显示文摘 | Yang Szeming Lina Jauyih Guoa Darhan | 1999 | Appl catal A : Gen1999，，181： | 1 |
| 7 | Failure modes of valve regulated lead acid batteires for electric bicle application in deep discharge 显示文摘 | Guoa Y Tang S Meng G | 2009 | Journal of Power Sources2009，191，1： | 1 |
| 8 | Effects of NaAlO2 on structure and corrosion resistance of micro-are oxidation coatings formed on AM6OB magnesium alloy in phosphateKOH electrolyte显示文摘 | Lianga J Tiana J Guoa B G | 2005 | Surface & Coatings Technology2005，199，23： | 1 |
| 9 | A boundary method for out lier detection based on support vector domain description显示文摘 | Guoa S M Chena L C Tsaib J S H | 2009 | Pattern Recognition2009，42，： | 1 |
| 10 | Forecasting stock indices using radial basis function neural networks optimized by artificial fish swarm algorithm显示文摘 | Wei Shena Xiaopen Guoa | | 0，，03： | 1 |
| 11 | A 3D Conjugate Heat Transfer Model for Continuous Wire Casting显示文摘 | T A Blase Z X Guoa | 2004 | Materials Science and Engineering2004，，365： | 1 |
| 12 | Effects of clear plastic film mulch on yield of spring wheat 显示文摘 | LiFM GuoA H W eiH | 1999 | Field Crops Res1999，63，： | 1 |
| 13 | A viscohyper-elas-tic constitutive description of elastomer behavior at high strainrates显示文摘 | Pouriayevali H Guoa Y B Shima V P W | 2011 | Procedia Engineering2011，10，： | 1 |
| 14 | Synthesis of zirconium-rich PZT ceramics by hydroxide co-precipitation under hot-press显示文摘 | GUOA L LYASHCHENKOB A DONG X L | 2002 | Mater Lett2002，56，： | 1 |
| 15 | Influence of various cations on redox behavior of I-and I3-and comparison between KI complex with 18-crown-6 and 1,2-dimethyl-3-propylimidazolium iodide in dye-sensitized solar cells显示文摘 | SHI W DAI S WANGA K PANA X ZENGA L HUA L KONGA F GUOA L | 2005 | Electrochimica Acta2005，50，： | 1 |
| 16 | Na+/H+ antiporter activity of the SOS1 gene:lifetime imaging analysis and electrophysiological studies on Arabidopsis seedlings显示文摘 | GUOA K M BABOURINAA O RENGELA Z | | 0，，02： | 1 |
| 17 | Lipoxin A4 analogue protectsbrain and reduces inflammation in a rat model of focal cerebralischemia reperfusion显示文摘 | Xi-Hong Yea Yan Wub Pei-Pei Guoa | 2010 | Brain research2010，1323，： | 1 |
| 18 | The role of a membrane performance enhancer in a membrane bioreactor: a comparison with other submerged membrane hybrid systems 显示文摘 | Guoa W S Vigneswarana S | 2008 | Desalination2008，231，13： | 1 |
| 19 | Administration of a CO-releasing molecule induces late preconditioning against myocardial infarction 显示文摘 | Steina AB Guoa Y Tana W | 2005 | J Mol Cell Cardiol2005，38，1： | 1 |
| 20 | Investigation of discharge reaction mechanism of lithium/liquid electrolyte/sulfur battery显示文摘 | Ryua H S Guoa Z Ahn H J | 2009 | Journal of Power Sources2009，189，： | 1 |
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