Abstract
The crystal structure of the 1212-type cuprate (Tl,Cr)Sr 2(Ca,Tl)Cu 2O 7 was investigated using X-ray diffraction data and the Rietveld refinement technique. The refinement was performed using the tetragonal symmetry of space group P4/mmm. It was found that Cr atoms entered the partial Tl site while Tl atoms occupied the Ca site. (Tl,Cr) atomes displaced from the origin to (0.101(1), 0, 0), and O(3) shifted from (0.5, 0.5, 0) to (0.626(8), 0.5, 0). The refined lattice parameters were a = 3.8155(1) A ̊ and c = 12.0222(5) A ̊ . The refined composition was (Tl 0.812Cr 0.100Ca 0.088)Sr 2(Ca 0.842Tl 0.158)Cu 2O 7. Cr atoms were most likely to be at a high valence state. The enhancement of T c in the (Tl,Cr)-1212 cuprate is briefly discussed based on the structure parameters by comparison with the un-doped TlSr 2CaCu 2O 7.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
