Crystal Research and Technology

Cover image for Vol. 48 Issue 2

February 2013

Volume 48, Issue 2

Pages 55–126

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Issue Information
    4. Contents
    5. Original Papers
    1. You have free access to this content
      Cover Picture

      Article first published online: 13 FEB 2013 | DOI: 10.1002/crat.201390002

  2. Issue Information

    1. Top of page
    2. Cover Picture
    3. Issue Information
    4. Contents
    5. Original Papers
    1. You have free access to this content
      Issue Information

      Article first published online: 13 FEB 2013 | DOI: 10.1002/crat.201390003

  3. Contents

    1. Top of page
    2. Cover Picture
    3. Issue Information
    4. Contents
    5. Original Papers
    1. You have free access to this content
      Contents: (Cryst. Res. Technol. 2/2013) (pages 55–57)

      Article first published online: 13 FEB 2013 | DOI: 10.1002/crat.201311055

  4. Original Papers

    1. Top of page
    2. Cover Picture
    3. Issue Information
    4. Contents
    5. Original Papers
    1. The role of inner and internal radiation on the melt growth of sapphire crystal (pages 58–68)

      Mohammad Hossein Tavakoli, Talaye Arjmand Abasi, Shirin Omid and Ebrahim Mohammadi-Manesh

      Article first published online: 21 JAN 2013 | DOI: 10.1002/crat.201200432

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      In this paper, for an inductively heated Czochralski furnace used to grow sapphire single crystal, influence of the inner (wall-to-wall) and crystal internal (bulk) radiation on the characteristics of the growth process such as temperature and flow fields, structure of heat transfer and crystal-melt interface has been studied numerically using the 2D quasi-steady state finite element method. The obtained results of global analysis demonstrate a strong dependence of thermal field, heat transport structure and crystal-melt interface on both types of radiative heat transfer within the growth furnace.

    2. Microwave irradiation solvothermal technique: an optimized protocol for size-control synthesis of Ru nanoparticles (pages 69–74)

      Y. R. Suryawanshi, M. Chakraborty, S. Jauhari, S. Mukhopadhyay, K. T. Shenoy and R. Shridharkrishna

      Article first published online: 25 JAN 2013 | DOI: 10.1002/crat.201200412

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      Ruthenium (III) chloride salt and Poly (N-vinyl-2-pyrrolidone) (PVP as a capping agent) was dissolved in ethylene glycol, which played a dual role for synthesis, as solvent and also as reducing agent. Microwave (MW) irradiation was applied to the solvent which provided controllable …

    3. Catalyst-free thermally-evaporated growth and optical properties of ZnO nanowires on Si, GaN and sapphire substrates (pages 75–86)

      Tran Van Khai, Dong Sub Kwak, Yong Jung Kwon, Kwang Bo Shim and Hyoun Woo Kim

      Article first published online: 28 JAN 2013 | DOI: 10.1002/crat.201200454

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      Vertically well-aligned zinc oxide nanowires (NWs) with high density were successfully synthesized on Si, sapphire and GaN/sapphire substrates by thermal evaporation of zinc powders without catalysts or additives. The growth behavior of ZnO NWs was strongly dependent on the substrate materials. The effects of the substrate position on the structures and properties of ZnO NWs were primarily discussed. The morphology and crystallinity of the resultant NWs were studied by scanning …

    4. Synthesis, crystal structure and photophysical studies on a ruthenium(II) carbonyl hydrido compound based on 2,2′-bipyridyl-5,5′-dicarboxylic acid (H2bpdc) (pages 87–93)

      Jing Xiang, Zai-Gao Li and Hua Zou

      Article first published online: 5 FEB 2013 | DOI: 10.1002/crat.201200500

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      A novel complex, namely [RuII(PPh3)(CO)(H)(Hbpdc)]·2MeOH (1) (H2bpdc = 2,2′-bipyridyl-5,5′-dicarboxylic acid), has been synthesized from the reaction of H2bpdc with [RuII(PPh3)3(CO)(H)2] in methanol under mild condition and characterized by elemental analysis, IR spectrum, ESI mass spectrometry, and single crystal X-ray diffraction. The structure shows that the complex crystallizes in the monoclinic space group P21/c with unit cell parameters a = 11.8984(13) Å, b = 16.5180(18) Å, c = 25.5322(19) Å, β = 115.302(4)°, V = 4536.6(8) Å3, Z = 4. This compound features a 1-D supramolecular chain constructed via hydrogen bonds. Its photophysical properties have been investigated in MeOH solution and in the solid state at room temperature.

    5. Effect of Cu/In ratio on properties of CuInSe2 thin films prepared by selenization of Cu-In layers (pages 94–99)

      Jen-Bin Shi, Yu-Cheng Chen, Po-Feng Wu, Shui-Yuang Yang, Tsung-Kuei Kang, Ping-Chang Yang, Cheng-Li Lin, San-Lin Young and Ming-Cheng Kao

      Article first published online: 5 FEB 2013 | DOI: 10.1002/crat.201200269

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      In this paper, the chalcopyrite CuInSe2 thin films were fabricated from a selenization of electrodeposited Cu-In layers. In this study, the electrodeposition time of the In layer was set, but that for the Cu layer was not. The thin films were selenized in a sealed glass tube with pure Se powder by three different Cu layer samples at various electrodeposition times at 500 °C for 2 hours. An FE-SEM image of the sample shows that the copper-rich product has irregular agglomerates with a dense surface. The X-ray diffraction patterns show CuInSe2 peaks for all samples. However, the X-ray diffraction pattern reveals CuSe2 peaks when the electrodeposition time of the Cu layer increases. On the other hand, the band gap (Eg) of the samples decreases from 1.15 to 1.07 eV when the Cu/In ratio increases.

    6. Effect of laser-induced nanocrystallisation on the properties of electroless Ni-P/Ni-W-P duplex coatings (pages 100–109)

      H. Liu, R. X. Guo, J. S. Bian and Z. Liu

      Article first published online: 7 FEB 2013 | DOI: 10.1002/crat.201200427

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      This paper presents a comparative study of nanocrystallisation and the wear resistance of electroless plated Ni-P/Ni-W-P duplex coatings with a single Ni-W-P coating before and after high- power diode laser treatment. Effects of the laser operating parameters on microstructures, in terms of crystallisation, porosity formation, phase transformation and grain growth, were investigated using scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDX) and quantitatively X-ray Diffraction (XRD). Microhardness and wear behaviour of the coatings before and after laser treatment were evaluated by measurement of coating surface and cross-section hardness as well as un-lubricated friction and wear tests. The results revealed that in the case of laser treatment, the Ni-P/Ni-W-P duplex coatings offered better wear resistance than the single …

    7. Evolution of hierarchical-structured CaCO3 in binary mixed solvent (pages 110–115)

      Lina Wang, Dalai Jin and Longcheng Wang

      Article first published online: 31 JAN 2013 | DOI: 10.1002/crat.201200318

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      Calcium carbonate with hierarchical structure was synthesized in water/organic compound binary soluvent by a chemical solution process within CaCl2/NaCO3 reaction system. Acetone, isopropanol, glycol, tetrahydrofuran were selected as the organic compound. Evolution of the hierarchical structure of CaCO3 was investigated. The as-prepared products were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). CaCO3 aggregations with spicate hierarchical …

    8. Processes in phase boundary region during liquid phase growth (pages 116–126)

      N. S. Peev

      Article first published online: 13 FEB 2013 | DOI: 10.1002/crat.201200323

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      In the present work the model of smeared phase boundary region, separating the liquid and the solid phases, has been considered. On the basis of this model the distribution and behavior of the components within the phase boundary during liquid phase growth is investigated. We have assumed that the effective supersaturation, which affects the growth rate, lies at the upper end of the phase boundary region.

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