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| 1 | Growth and dielectric properties of Ta2O5 single crystals grown by laser heated pedestal growth technique显示文摘Ta2O5 single crystals have been grown by the laser heated pedestal growth (LHPG) technique up to several centimeters length with diameter of 1.1 mm. The crystal, characterized by X-ray diffraction, dielectric measurement, and thermal expansion analysis, has Htri-Ta2O5 symmetry. Dielectric permittivity, loss tangent along [001] and [110] direction were investigated over the temperature range from -80 ℃ to 100 ℃. Large dielectric anisotropy in Ta2O5 single crystal was observed. At room temperature, the dielectric permittivities (1 MHz) along [001] and [110] are 33.2 and 231.9, respectively. The reason of dielectric enhancement in Ta2O5 crystal grown by LHPG was also discussed. | 蒋毅坚 Ruyan Guo A. S. Bhalla | 2008 | 中国激光2008，35，11： | 2 |
| 2 | 显示文摘 | Hathalkarn Choosuwan Ruyan Guo Amar Bhalla S Balachandran U | 2001 | Ferroelectrics2001，263，： | 1 |
| 3 | Zinc Oxide Single-crystal Microtubes显示文摘 | Jiping Cheng Ruyan Guo Qiming Wang | 2004 | Applied Physics Letters2004，85，22： | 1 |
| 4 | The perovskite structure---a review of its role in ceramics science and technology 显示文摘 | BHALLA A S GUO Ruyan ROY R | 2000 | Mat Res Innovat2000，4，： | 1 |
| 5 | ZnO Microtube Ultraviolet Detectors显示文摘 | Jiping Cheng Yunjin Zhang Ruyan Guo | 2008 | Journal of Crystal Growth2008，310，1： | 1 |
| 6 | Nb 2 O 5 -based oxide ceramics and single crystals-investigation of dielectric properties显示文摘 | H. Manuspiya Ruyan Guo A.S. Bhalla | 2004 | Ceramics International2004，，7： | 1 |
| 7 | Measurement of thermal strain and total polarization estimation of lead zirconate titanate–lead zinc niobate ceramics显示文摘 | Muangjai Unruan Anurak Prasatkhetragarn Yongyut Laosiritaworn Supon Ananta Athipong Ngamjarurojana Rattikorn Yimnirun Ruyan Guo Amar Bhalla | 2012 | Journal of Materials Science2012，，15： | 1 |
| 8 | Piezoelectric and strain properties of Ba(Ti1-xZrx)O3 ceramics显示文摘 | Zhi Yu Chen Ang Ruyan Guo | | 0，，03： | 1 |
| 9 | The Perovskite Structure-a Review of Its Role in Ceramic Science and Technology显示文摘 | Bhalla A S Guo Ruyan Roy Rusruum | 2000 | Mat Res Innovat2000，4，： | 1 |
| 10 | Zinc Oxide Single- crystal Microtubes显示文摘 | Cheng Jiping Guo Ruyan Wang Qingming | 2004 | Applied Physics Letters2004，85，22： | 1 |
| 11 | ZnO microtube ultraviolet detectors显示文摘 | Jiping Cheng Yunjin Zhang Ruyan Guo | 2007 | Journal of Crystal Growth2007，，1： | 1 |
| 12 | Raman spectroscopy of Mg-Ta order-disorder in BaMg 1 3 Ta 2 3 O 3显示文摘 | I.G. Siny Ruiwu Tao R.S. Katiyar Ruyan Guo A.S. Bhalla | 1997 | Journal of Physics and Chemistry of Solids1997，，2： | 1 |
| 13 | Theory, simulation and experiment of optical properties of cobalt ferrite(CoFe2O4) nanoparticles显示文摘Optical properties of cobalt ferrite(CoFe2O4) nanoparticles are modeled and simulated employing finite element analysis(FEA) and density functional theory(DFT) for different particle sizes. The simulated absorption maxima of electronic excitations is red-shifted from 330 nm to 410 nm using finite element analysis and from 331.27 nm to 409.07 nm using quantum mechanical method, with increasing particle sizes from 40 nm to 50 nm. The measured absorption maxima matched the simulated results reasonably well and red-shifted to longer wavelengths from 315.59 nm to 426.73 nm with the increase in particle sizes from 30 nm to 50 nm. The DFT simulated, FEA simulated and experimentally derived optical band gap energies, Eg, were also acquired and compared. The simulated Egvalues decreased from 3.228 to 2.478 e V and from 3.266 to 2.456 e V, while the experimental Egvalue decreased from 3.473 to 2.697 e V, with increasing the particle sizes. The research demonstrated that the optical absorption of CoFe2O4 nanoparticles can be described with high accuracy using the quantum mechanical interpretation based on DFT. FEA based simulations have shown limitations for smaller(< 40 nm) nanoparticles likely due to the increased surface scattering that prevented a stable solution for simulations beyond the quasistatic limit. The DFT computational tool developed by this study can enable both the low cost computation and highly reliable prediction of optical absorption properties and optical band edges, and thus contribute to understanding and design of CoFe2O4 nanoparticle properties prior to fabrication and functionalization of them, for a wide range of applications especially for sensing and photonic wave modulations. | Elham Gharibshahi Brandon D.Young Amar S.Bhalla Ruyan Guo | 2020 | Journal of Materials Science & Technology2020，54，22： | 0 |
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