Abstract
In this research, undoped-Sr2TiO4 and codoped-Sr2TiO4 Ruddlesden-Popper (RP) phase compounds have been synthesized with mole variations of Sr:Ti and dopants. Double substitution with Sm3+ for Sr2+ sites and Nb5+ for Ti4+ sites forming Sr2-xSmxTi1-yNbyO4 (x = 0.0125; 0.025; 0.05; 0.1 and y = 0.0125) aimed to increase the number of electrons carrier, so that the electrical conductivity enhanced. The XRD patterns showed that the highest purity of prepared Sr2TiO4 RP phase sample was obtained at the mole ratio of Sr:Ti of 2:1 with specific peaks at 2θ: 31.35°, 46.73°, and 57.33°. Then, this mole ratio was used to prepare the codoped-samples, and the XRD patterns showed the Sr1.95Sm0.05Ti0.9875Nb0.0125O4 sample has the highest purity. SEM images showed that the undoped-Sr2TiO4 and codoped-Sr2TiO4 samples have a plate-like particles with micrometer size. The electrical conductivity of Sr1.95Sm0.05Ti0.9875Nb0.0125O4 sample was measured to be a 17-fold increase compared to that of undoped-Sr2TiO4 sample.Â
Highlights
Generator termoelektrik merupakan salah satu perangkat hasil teknologi yang berpotensi sebagai sumber energi alternatif berkelanjutan karena mampu mengkonversi panas buangan menjadi energi listrik[1]
phase compounds have been synthesized with mole variations of Sr
The X-ray diffraction (XRD) patterns showed that the highest purity of prepared Sr2TiO4 RP phase sample was obtained at the mole ratio
Summary
Bahan kimia Bahan yang digunakan yaitu stronsium(II) karbonat (SrCO3) (Aldrich 99,9%), titanium(IV) oksida (TiO2) (Aldrich 99,9%), niobium(V) oksida (Nb2O5) (Aldrich 99,9%), samarium(III) oksida (Sm2O3) (Aldrich 99,9%), garam kalium sulfat (K2SO4), natrium sulfat (Na2SO4) (Merck) dan akuabides. Semua bahan dengan kemurnian tinggi sehingga tidak dilakukan pemurnian lebih lanjut. Peralatan Peralatan yang digunakan yaitu oven (Labtech), furnace (Nabertherm), hot plate (IKA* C-MAG HS 7), neraca analitik (Kern ALI 220-4 M), lumpang dan alu, aluminium foil, plastik pembungkus, kertas minyak, kertas saring whatman No., kurs alumina, spatula, jangka sorong (Nankai, 150MM Digital Caliper) serta beberapa peralatan gelas seperti gelas piala, erlenmeyer, corong dan batang pengaduk. Instrumen yang digunakan adalah XRD (Philip X’pert Powder Type PW4030/60), SEM-EDX (6510(LA)) dan LCR meter (TH 2820)
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