Crystal Research and Technology

Cover image for Vol. 52 Issue 5

Editor: Wolfgang Neumann (Editor-in-Chief), Klaus-W. Benz (Consulting Editor)

Online ISSN: 1521-4079

Associated Title(s): physica status solidi (a), physica status solidi (b), physica status solidi (RRL) - Rapid Research Letters

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Recently Published Articles

  1. Influence of the temperature and composition on the crystal structure of the AgBiSe2-AgBiS2 system

    Sunanda Mitra and David Berardan

    Version of Record online: 19 MAY 2017 | DOI: 10.1002/crat.201700075

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    In this manuscript, we show that a complete solid-solution exists between AgBiSe2-AgBiS2, and we report on the structural phase diagram. Sulfur-rich samples exhibit one structural phase transition from a low temperature hexagonal phase to a high temperature cubic one, whereas selenium rich samples also exhibit an intermediate rhombohedral phase, with a limit between the 2-phases and 3-phases region at Se = 0.8.

  2. Effect of withdrawal rate transition on microstructural features of a single crystal Ni-based superalloy

    Fazlollah Sadeghi, Ahmad Kermanpur, Davoud Heydari and Majid Bahmani

    Version of Record online: 18 MAY 2017 | DOI: 10.1002/crat.201700012

    Thumbnail image of graphical abstract

    The effect of withdrawal rate transition on various microstructural features of a single crystal Ni-based superalloy was investigated. The dendrite morphology, spacing and orientation were studied using optical microscopy, EBSD and RO-XRD techniques. The results showed a gradual decreasing trend in PDAS and SDAS by sudden increasing of withdrawal rate. The dendritic growth was found history-dependent and its dependency is related to the solidification condition. The withdrawal rate transition was seen to be influential on crystallographic misorientation such that, more severe transition would result in a higher misorientation change.

  3. Industrial growth and characterization of Si-doped GaAs crystal by a novel multi-crucible Bridgman method

    Min Jin, Hui Shen, Shiji Fan, Qingbo He and Jiayue Xu

    Version of Record online: 18 MAY 2017 | DOI: 10.1002/crat.201700052

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    A novel multi-crucible Bridgman method is developed to produce Ø2“ Si-doped GaAs crystals. Twinning and high dislocation density are the main defects often take place. After the solid-liquid interface and crystal cooling rate are optimized, the Si-doped GaAs crystals with favorable single crystalline yield are successfully obtained. The result proves this multi-crucible Bridgman method is a feasible way for industrial growth of Si-doped GaAs crystals for opto-electronic application.

  4. Evolution of microstructure of niobium carbide NbC0.77 powders

    A. S. Kurlov, A. I. Gusev, A. A. Rempel, V. S. Kuznetsov, I. A. Bobrikov and A. M. Balagurov

    Version of Record online: 18 MAY 2017 | DOI: 10.1002/crat.201700061

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    Microinhomogeneities of NbC0.77 nanoparticle and distribution of microstrains εhkl in the non-equivalent directions [kkl] in this cubic niobium carbide.

  5. Effects of tricarballylic acid on phase transformation of calcium sulfate hemihydrate to the dihydrate form

    Sevgi Polat and Perviz Sayan

    Version of Record online: 8 MAY 2017 | DOI: 10.1002/crat.201600395

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    During the phase transformation of calcium sulfate hemihydrate to calcium sulfate dihydrate, the average activation energies of the samples were calculated from Friedman, FWO, and KAS models. These results showed a good fit with each other. By incorporating an additive into the media, the activation energy of the samples has increased significantly. A consistent data obtained simultaneously from TGA-FTIR and TGA-MS confirmed that the tricarballylic acid used as an additive adsorbed on the crystal surface.

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