ridm@nrct.go.th   ระบบคลังข้อมูลงานวิจัยไทย   รายการโปรดที่คุณเลือกไว้

Strain effects on point defects and chain-oxygen order-disorder transition in 123 cuprate compounds

หน่วยงาน Nanyang Technological University, Singapore

รายละเอียด

ชื่อเรื่อง : Strain effects on point defects and chain-oxygen order-disorder transition in 123 cuprate compounds
นักวิจัย : Su, Haibin , Welch, David O. , Wong-Ng, Winnie
คำค้น : DRNTU::Engineering::Materials::Magnetic materials
หน่วยงาน : Nanyang Technological University, Singapore
ผู้ร่วมงาน : -
ปีพิมพ์ : 2547
อ้างอิง : Su, H., Welch, D. O. & Wong-Ng, W. (2004). Strain effects on point defects and chain-oxygen order-disorder transition in 123 cuprate compounds. Physical Review B, 70. , http://hdl.handle.net/10220/6931 , http://dx.doi.org/10.1103/PhysRevB.70.054517
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : Physical review B
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

The energetics of Schottky defects in 123 cuprate superconductor series RBa2Cu3O7 (where R =lanthandies) and YA2Cu3O7 (A=alkali earths), were found to have unusual relations if one considers only the volumetric strain. Our calculations reveal the effect of nonuniform changes of interatomic distances within the R-123 structures, introduced by doping homovalent elements, on the Schottky defect formation energy. The energy of formation of Frenkel pair defects, which is an elementary disordering event, in 123 compounds can be substantially altered under both stress and chemical doping. Scaling the oxygen-oxygen short-range repulsive parameter using the calculated formation energy of Frenkel pair defects, the transition temperature between orthorhombic and tetragonal phases is computed by quasichemical approximations (QCA’s). The theoretical results illustrate the same trend as the experimental measurements in that the larger the ionic radius of R, the lower the orthorhombic/tetragonal phase transition temperature. This study provides strong evidence of the strain effects on order-disorder transition due to oxygens in the CuO chain sites.

บรรณานุกรม :
Su, Haibin , Welch, David O. , Wong-Ng, Winnie . (2547). Strain effects on point defects and chain-oxygen order-disorder transition in 123 cuprate compounds.
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Su, Haibin , Welch, David O. , Wong-Ng, Winnie . 2547. "Strain effects on point defects and chain-oxygen order-disorder transition in 123 cuprate compounds".
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Su, Haibin , Welch, David O. , Wong-Ng, Winnie . "Strain effects on point defects and chain-oxygen order-disorder transition in 123 cuprate compounds."
    กรุงเทพมหานคร : Nanyang Technological University, Singapore, 2547. Print.
Su, Haibin , Welch, David O. , Wong-Ng, Winnie . Strain effects on point defects and chain-oxygen order-disorder transition in 123 cuprate compounds. กรุงเทพมหานคร : Nanyang Technological University, Singapore; 2547.