Low porosity fese preferred orientation crystal growth by bridgman method

Chia Ming Yang, Po Wei Chen, Jui-Chao Kuo, Pavel Diko, In-Gann Chen, Maw Kuen Wu

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The new kind of iron-based superconductor FeSe which has being widely studied recently is arsenic-free and has about 8 K of Tc. The less poisonous and simple binary FeSe is interesting for both scientific studies and engineering applications, even though its Tc is lower than that of other iron-based compounds. Recently, the single crystal and thin film technology of FeSe has been studied to realize the anisotropic property. In our study, the highly preferred orientation poly-crystal was grown by the Bridgman method. The vacuum condition during growth affects the porosity of FeSe. It is difficult to produce high density under 1 atmosphere even when maintained at high temperature for a long time. When the pressure is controlled at less than 10-1 torr, ultra low porosity (and high density) crystal can be grown. Polarized optical microscope images show the single crystal domain up to about 5 mm with (110) preferred orientation by XRD analysis. A XRD peak shift is observed between samples grown by furnace-cooling and the Bridgman method, which is supposed to be due to residual stress during growth. It also induced a Tc decrease to 5.9 K in the Bridgman sample, but recovered to 6.8 K after annealing. From the microstructure, considerable columnar precipitation is observed in the Bridgman sample, which is identified as iron-rich phase by energy dispersive spectrum (EDS) analysis.

Original languageEnglish
Article number5638148
Pages (from-to)2845-2848
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume21
Issue number3 PART 3
DOIs
Publication statusPublished - 2011 Jun 1

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Crystal growth from melt
Bridgman method
Crystallization
Crystal growth
Crystal orientation
crystal growth
Iron
Porosity
Single crystals
porosity
iron
Crystals
Arsenic
Density (specific gravity)
Spectrum analysis
Residual stresses
Furnaces
Microscopes
single crystals
Vacuum

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

Yang, Chia Ming ; Chen, Po Wei ; Kuo, Jui-Chao ; Diko, Pavel ; Chen, In-Gann ; Wu, Maw Kuen. / Low porosity fese preferred orientation crystal growth by bridgman method. In: IEEE Transactions on Applied Superconductivity. 2011 ; Vol. 21, No. 3 PART 3. pp. 2845-2848.
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Low porosity fese preferred orientation crystal growth by bridgman method. / Yang, Chia Ming; Chen, Po Wei; Kuo, Jui-Chao; Diko, Pavel; Chen, In-Gann; Wu, Maw Kuen.

In: IEEE Transactions on Applied Superconductivity, Vol. 21, No. 3 PART 3, 5638148, 01.06.2011, p. 2845-2848.

Research output: Contribution to journalArticle

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