In this study, the effects of a sintering aid CuTa 2O 6 (CT) on (Na 0.5K 0.5)NbO 3 (NKN) ceramics were investigated. The diffracted angles in XRD profiles decreased because the Nb-sites were replaced by Cu and Ta ions, causing the expansion of lattice volume. SEM images showed smaller grain sizes at a low concentration of CuTa 2O 6, and grain sizes increased as the concentration of CuTa 2O 6 doping increased because of a liquid phase formed. When CuTa 2O 6 dopants were doped into NKN ceramics, the T O-T and T c phase transitions decreased because the replacement of Ta 5+ ions in the B-site. A high bulk density (4.595 g/cm 3) and electromechanical coupling factor (k p, k t) were enhanced when CT dopants were doped into NKN ceramics. Moreover, the mechanical quality factor (Q m) also increased from 67 to 1550. NKN ceramics with sintering aid CuTa 2O 6 doping showed excellent piezoelectric properties: k p: 42.5%; k t: 49.1%; Q m: 1550; and d 33: 96 pC/N.
|頁（從 - 到）||998-1003|
|期刊||Materials Research Bulletin|
|出版狀態||Published - 2012 4月|
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