Precursor influence on the raman spectrum of KNNLiTaLa_(0.01) prepared by two different methods (5 pages)

• J. Fuentes ^[4] ; H'Linh Hmŏk ^[1] ; J. Portelles ^[4] ; Z.I. Bedolla-Valdez ^[2] ; J.F. Rebellón-Watson ^[4] ; R. López-Noda ^[4] ; Y. de Armas Figueroa ^[4] ; J.M. Siqueiros ^[3]
  1. [1] Văn Lang University

     Văn Lang University

     Vietnam

     
  2. [2] Tecnológico Nacional de México

     Tecnológico Nacional de México

     México

     
  3. [3] Universidad Nacional Autónoma de México

     Universidad Nacional Autónoma de México

     México

     
  4. [4] Instituto de Cibernética, Matemática y Física,CITMA, La Habana, Cuba

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• Localización: Revista Mexicana de Física, ISSN-e 0035-001X, Vol. 70, Nº. 2, 2024
• Idioma: inglés
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• Resumen

  • 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].