Resumen de Precursor influence on the raman spectrum of KNNLiTaLa_(0.01) prepared by two different methods (5 pages)
J. Fuentes, H'Linh Hmŏk, J. Portelles, Z.I. Bedolla Valdez, J.F. Rebellón Watson, R. López Noda, Y. de Armas Figueroa, J. M. Siqueiros
This work presents a study of ceramics with the (K_(0.44)Na_(0.52)Li_(0.04))_(0.97)La_(0.01)Nb_(0.9)Ta_(0.1)O_(3) composition through their Raman spectra. In the previous studies [1], this particular composition has shown good permittivity and piezoelectric parameter values that justify a deeper investigation. Two sets of samples of these ceramic compounds were prepared using different methods. The first set was prepared using a classical solid-state reaction of oxides and carbonates, as described in Ref. 2. The second set was prepared using the NaNbO_(3) as a precursor. The Raman spectra of the samples obtained by the direct ceramic method consisted of 4 modes. In contrast, the spectra of the samples obtained using the precursor showed a shift of the wavenumber of the A_(1g)(ν1) mode peak towards lower values and consisted of six modes with the appearance of two additional IR modes, F_(1u)(ν3) and F_(2g)(ν4). Notably, the use of the precursor preparation route led to important improvements resulting in a more straightforward method than that of Saito et al. [3].
