Metal–insulator transition and hopping conduction mechanisms in the La0.7Ba0.3MnO3 compound

Jurado, J. F.; Játiva, J.

doi:10.1016/j.jmmm.2013.01.013

Cited by 9 publications

(1 citation statement)

References 22 publications

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“…This structure can be modified through doping of divalent ion at La-site and transition ion at Mn-site. Substituted La-site with divalent ion such as Ba, Sr, and Ca can change Mn content from Mn 3+ to Mn 4+ , this phenomena can be explain with double exchange (DE) effect [1][2], a system by which electron mobility between the nearest Mn ions, preferably, those with aligned spins is preferred [3].…”

Section: Introductionmentioning

confidence: 99%

Analysis Crystal Structure of La0.7Ba(1-xSrx)0.3MnO3 by Sol-Gel Method

Hartati

Saptari

Tjahjono

2020

Fiziya

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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+ .

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Section: Introductionmentioning

confidence: 99%