“…Tl 2 Ba 2 CuO 6+y shows interesting magnetic [1][2][3], optical [4,5], dielectric [6,7], mechanic [8] and microwave properties [9,10] and promising applications. Normally, Knight shifts and hyperfine structure constants of 63 Cu 2+ measured from nuclear magnetic resonance (NMR) experiment in Tl 2 Ba 2 CuO 6+y may provide useful local structure information and electronic properties of copper-oxygen planes and help to the understandings of superconductive and other physical properties of this material.…”