Analysis Crystal Structure of La0.7Ba(1-xSrx)0.3MnO3 by Sol-Gel Method
Abstract
Abstrak.
Penelitian tentang struktur kristal bahan La0.7(Ba1-xSrx)MnO3 menggunakan metode sol-gel telah berhasil dilakukan. Bahan-bahan dasar yang digunakan dicampur di atas hot plate diaduk sambil ditetesi ammonia solution sehingga mencapai pH 7, selanjutnya didiamkan sampai diperoleh bentuk gel. Gel dikeringkan pada suhu 120°C, selanjutnya dilakukan pra-kalsinasi dengan suhu 650°C selama 6 jam, dilanjutkan dengan kalsinasi pada suhu 1000°C selama 12 jam, dan kemudian disinter pada temperatur 1200°C selama 12 jam. Hasil refinement data XRD memberikan informasi bahwa struktur kristal La0.7(Ba1-xSrx)MnO3 adalah rombohedral dengan space grup R-3c. Penambahan substitusi ion Sr2+ mengakibatkan terjadinya penurunan intensitas dan pergeseran puncak ke arah sudut yang lebih besar. Hal ini disebabkan karena pengaruh jari-jari ion Sr2+ yang lebih kecil dibandingkan dengan jari-jari ion Ba2+ .
Abstract.
In this research, La0.7(Ba1-xSrx)0.3MnO3 compound (x = 0; 0.2; 0.3; and 0.5) by sol-gel method has been investigated. The compound used is mixed on a hot plate until reached a pH 7 when dropped ammonia solution, then let stand until turn into a gel. Dehydrated gel at 120°C, pra-calcination at 650°C for 6 hours, calcination t 1000°C for 12 hours, and sintering at 1200°C for 12 hours. The result of refinement XRD pattern shown that samples are single phase with rhombohedral crystal structure with R-3c space group. The intensity decrease and peak list shift to larger angle when Sr-substitution increased, it’s caused ionic radii of Sr2+ is smaller than Ba2+ .
Keywords
Full Text:
PDFReferences
J. F. Jurado and J. A. Játiva, “Metal–insulator Transition and Hopping Conduction Mechanisms in the La0.7Ba0.3MnO3 Compound,” J. Magn. Magn. Mater., vol. 335, pp. 6–10, Jun. 2013.
C. N. R. Rao, R. Mahesh, A. K. Raychaudhuri, and R. Mahendiran, “Giant Magnetoresistance, Charge Ordering and Other Novel Properties of Perovskite Manganates,” J. Phys. Chem. Solids, vol. 59, no. 4, pp. 487–501, Apr. 1998.
H. Rahmouni, A. Dhahri, and K. Khirouni, “The Effect of Tin Addition on the Electrical Conductivity of Sn-doped LaBaMnO3,” J. Alloys Compd., vol. 591, pp. 259–262, Apr. 2014.
P. W. Anderson and H. Hasegawa, “Considerations on Double Exchange,” Phys. Rev., vol. 100, no. 2, pp. 675–681, Oct. 1955.
H. Sawada, Y. Morikawa, K. Terakura, and N. Hamada, “Jahn-Teller Distortion and Magnetic Structures in LaMnO¬3,” p. 7.
A. J. Millis, B. I. Shraiman, and R. Mueller, “Dynamic Jahn-Teller Effect and Colossal Magnetoresistance in La1-xAxMnO3,” Phys. Rev. Lett., vol. 77, no. 1, pp. 175–178, Jul. 1996.
J. Wang, W. Wang, Y. Lei, and F. Qin, “Effect of Cation Size and Disorder on The Power loss of La0.7(Ba1−xSrx)0.3MnO3,” J. Magn. Magn. Mater., vol. 322, no. 13, pp. 1884–1888, Jul. 2010.
E. E. Fullerton, I. K. Schuller, H. Vanderstraeten, and Y. Bruynseraede, “Structural Refinement of Superlattices from X-ray Diffraction,” Phys. Rev. B, vol. 45, no. 16, pp. 9292–9310, Apr. 1992.
F. T. L. Muniz, M. A. R. Miranda, C. Morilla dos Santos, and J. M. Sasaki, “The Scherrer Equation and the Dynamical Theory of X-ray Diffraction,” Acta Crystallogr. Sect. Found. Adv., vol. 72, no. 3, pp. 385–390, May 2016.
A. Monshi, M. R. Foroughi, and M. R. Monshi, “Modified Scherrer Equation to Estimate More Accurately Nano-Crystallite Size Using XRD,” World J. Nano Sci. Eng., vol. 02, no. 03, pp. 154–160, 2012.
D. L. Bish and S. A. Howard, “Quantitative Phase Analysis Using the Rietveld Method,” J. Appl. Crystallogr., vol. 21, no. 2, pp. 86–91, Apr. 1988.
L. M. Moreau, D.-H. Ha, H. Zhang, R. Hovden, D. A. Muller, and R. D. Robinson, “Defining Crystalline/Amorphous Phases of Nanoparticles through X-ray Absorption Spectroscopy and X-ray Diffraction: The Case of Nickel Phosphide,” Chem. Mater., vol. 25, no. 12, pp. 2394–2403, Jun. 2013.
H. M. A. Gan, K. P. Lim, S. K. Chen, Z. A. Talib, and J. K. Wong, “Structural, Microstructural and Electrical Properties of La 0.67 ( Ba , Sr ) 0.33 MnO 3 System,” p. 4, 2015.
DOI: https://doi.org/10.15408/fiziya.v3i1.15029 Abstract - 0 PDF - 0
Refbacks
- There are currently no refbacks.
This work is licensed under a CC-BY-SAÂ