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Journal > Jurnal Sains Materi Indonesia > QUALITATIVE AND QUANTITATIVE ANALYSIS OF (Na0.5Bi0.5)TiO3 PHASE WITH THE X-RAY DIFFRACTION TECHNIQUE USING THE RIETVELD METHOD

 

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Jurnal Sains Materi Indonesia
Vol 13, No 1 (2011): Oktober 2011
QUALITATIVE AND QUANTITATIVE ANALYSIS OF (Na0.5Bi0.5)TiO3 PHASE WITH THE X-RAY DIFFRACTION TECHNIQUE USING THE RIETVELD METHOD
Sukirman, Engkir ( Pusat Teknologi Bahan Industri Nuklir (PTBIN) - BATAN, Kawasan Puspiptek, Serpong 15314, Tangerang Selatan)
Ahda, Syahfandi ( Pusat Teknologi Bahan Industri Nuklir (PTBIN) - BATAN, Kawasan Puspiptek, Serpong 15314, Tangerang Selatan)
Article Info   ABSTRACT
Published date:
21 Nov 2013
 
The qualitative and quantitative phase analysis for (Na0.5Bi0.5)TiO3 (NBT) phase have been carried out by the X-ray diffraction technique using the Rietveld method. The NBT sample was synthesized by the solid reaction method. Micro structure of the sample was studied using the electron microscope. In this study it have been proposed six models of the least square input parameters, namely NBT1, NBT2, NBT3, NBT4, NBT5 and NBT6 model. The analysis results showed that the most suitable model is NBT3, i.e., a model in which the NBT consists of two phases, namely tetragonal phase, space group I4/mcm, No. 140, lattice parameters a = b = 5.485 (1) Å, c = 7.772 (2) Å, α = β = γ = 90o, weight fraction 93.44% and the rhombohedral phase, space group R3c, No. 161-1, lattice parameters a = b = c = 3.908 (1) Å, α = β = γ = 90,08(4)°, weight fraction 6.56%. Reliability indexs Rwp = 15.91 and Rp = 11.86. Lattice strain (ηT) and crystallite size (DT) for the tetragonal crystal system are respectively 0.015 and 150.00 Å. While the lattice strain (ηR) and crystallite size (DR) for the rhombohedral crystal system are respectively 0.016 and 142.857 Å. The presence of constituent elements of the NBT compound, i.e., Bi, Na, Ti and O, are proven by the X-ray dispersive scattering curve. The phase of NBT sample is redominantly tetragonal (> 90%). The formation of rhombohedral phase (< 7%) in the NBT sample may be due to the grain size and pressure distribution in the precursors during the making of pellets are uneven. So that, the diffusion of the atoms Bi, Na, and Ti during sintering process is not evenly distributed throughout the sample.Keywords: (Na0.5Bi0.5)TiO3, Qualitative and quantitative analysis, Rietveld method.
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