Synthesis and Characterization of LuBa2Cu3Oz Superconductors by Using of a Polymeric Precursor

Vol. 63, No. 10, October 2013, pp. 1176∼1179

New Physics: Sae Mulli, DOI: 10.3938/NPSM.63.1176

Synthesis and Characterization of LuBa

₂

Cu

₃

O

_z

Superconductors by Using of a Polymeric Precursor

Man Seok Lee · Ho Keun Lee

^∗

Department of Physics, Kangwon National University, Chuncheon 200-701, Korea

Sang-Il Seok

Korea Research Institute of Chemical Technology, Daejeon 305-343, Korea (Received 31 July 2013 : revised 6 August 2013 : accepted 10 October 2013)

The Pechini polymeric precursor method was successfully used to synthesize polycrystalline LuBa2Cu3Oz (Lu-123) superconducting compounds. The results of X-ray diffraction (XRD), Scan- ning electron microscopy (SEM) and resistivity measurements showed that the Lu-123 phase was formed when heated at temperatures between 860^◦C and 880^◦C under a 9% O2-91% N2 atmo- sphere after pyrolysis of the precursor at 350^◦C for 5 h in air and 600^◦C for 3 h in O2. The polycrystalline samples sintered at 880^◦C under a low oxygen partial pressure revealed a single phase and showed superconductivity comparable to that of the sample prepared by using the solid state reaction method. Compared to the phase formation temperature of the sample prepared by the solid state reaction method, that of Lu-123 was found to be lower, possibly due to the fine particle size after the pyrolysis.

PACS numbers: 74.72.-h, 74.72.Jf, 74.62.Bf, 74.25.Fy

Keywords: Synthesis, LuBa2Cu3Oz, Polymeric precursor, Superconductivity

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Cu

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1176

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Synthesis and Characterization of LuBa2Cu3Oz Superconductors· · · – Man SeokLeeet al. 1177

PACS numbers: 74.72.-h, 74.72.Jf, 74.62.Bf, 74.25.Fy Keywords:½+Ë$í, LuBa₂Cu3Oz, Polymeric precursor,œí„•¸

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∗E-mail: hklee221@kangwon.ac.kr

Fig. 1. XRD patterns calcined at 860^◦C for samples pre- pared by (a) solid state reaction method and (b) poly- meric precursor method.

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1178 New Physics: Sae Mulli, Vol. 63, No. 10, October 2013

Fig. 2. (XRD patterns sintered at 880^◦C for samples prepared by (a) solid state reaction method and (b) poly- meric precursor method.

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Synthesis and Characterization of LuBa2Cu3Oz Superconductors· · · – Man SeokLeeet al. 1179

Fig. 4. SEM photographs for Lu-123 bulk samples pre- pared by (a) solid state reaction method and (b) poly- meric precursor method.

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