Role of Nd_2O_3 nanoparticles addition on microstructural and superconducting properties of YBa_2Cu_3O_(7–δ) ceramics  

作　　者：Aima Ramli Abdul Halim Shaari Hussein Baqiah Chen Soo Kean Mohd Mustafa Awang Kechik Zainal Abidin Talib 

机构地区：[1]Superconductivity and Thin Films Laboratory, Department of Physics, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia [2]Department of Physics, School of Fundamental Science, Universiti Malaysia Terengganu (UMT), 21030 Kuala Terengganu, Terengganu, Malaysia

出　　处：《Journal of Rare Earths》2016年第9期895-900,共6页稀土学报（英文版）

基　　金：Project supported by Exploratory Research Grants Scheme(ERGS)(5527047);University Putra Malaysia through the Putra Grant(9440100);Ministry of Education Malaysia(MOE)and University Malaysia Terengganu(UMT)

摘　　要：The effects of Nd2O3 nanoparticles addition on microstructure, transport and AC susceptibility properties of YBa2Cu3O7–δ（Y123） superconductors were systematically investigated using X-ray diffraction （XRD）, scanning electron micrograph （SEM）, four point probe measurement and AC spectrometer. It was found that the added samples were predominant by Y-123 phase beside small amount of Y-211 and unreacted Nd2O3secondary phases. All added samples preserved the orthorhombic structure similar to the pure sample and no orthorhombic-to-tetragonal transition occurred. The samples became more porous and their grain size significantly de-creased with addition of Nd2O3. The addition of nano-Nd2O3 disturbed the grain growth of Y123, thus resulting in the degradation of superconducting properties of the samples. The superconducting transition temperature （Tc onset） of samples decreased from 92 K for x=0.0 to 78 K forx=1.0 wt.%, which could be attributable to oxygen vacancy disorder. From AC susceptibility result, the inter- and intra-granular loss peaks became wider and broader with increase of Nd2O3 addition due to the weakening of grains coupling. On the other hand, the inter-granular critical current density,Jcm, was found to increase with Nd2O3 addition and had the highest value at x=0.6, confirming that Nd2O3 nanoparticles acted as pinning centers in Y123 matrix.The effects of Nd2O3 nanoparticles addition on microstructure, transport and AC susceptibility properties of YBa2Cu3O7–δ（Y123） superconductors were systematically investigated using X-ray diffraction （XRD）, scanning electron micrograph （SEM）, four point probe measurement and AC spectrometer. It was found that the added samples were predominant by Y-123 phase beside small amount of Y-211 and unreacted Nd2O3secondary phases. All added samples preserved the orthorhombic structure similar to the pure sample and no orthorhombic-to-tetragonal transition occurred. The samples became more porous and their grain size significantly de-creased with addition of Nd2O3. The addition of nano-Nd2O3 disturbed the grain growth of Y123, thus resulting in the degradation of superconducting properties of the samples. The superconducting transition temperature （Tc onset） of samples decreased from 92 K for x=0.0 to 78 K forx=1.0 wt.%, which could be attributable to oxygen vacancy disorder. From AC susceptibility result, the inter- and intra-granular loss peaks became wider and broader with increase of Nd2O3 addition due to the weakening of grains coupling. On the other hand, the inter-granular critical current density,Jcm, was found to increase with Nd2O3 addition and had the highest value at x=0.6, confirming that Nd2O3 nanoparticles acted as pinning centers in Y123 matrix.

关 键 词：YBCO critical temperature CO-PRECIPITATION AC susceptibility critical current density rare earths 

分 类 号：TM26[一般工业技术—材料科学与工程] TG132.26[电气工程—电工理论与新技术]