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All Journal Omega: Jurnal Fisika dan Pendidikan Fisika Indonesian Journal of Chemical Science
Budhy Kurniawan
Departemen Fisika-FMIPA, Universitas Indonesia Kampus Baru Depok 16242
Chemical Engineering, Chemistry & Bioengineering Chemistry Education Physics

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Microwave Absorber Properties \ce {La_{0.67}Sr_{0.33}Mn_{0.8}Ni_{0.2}O3} Using Sol Gel Synthesis Methods Laksanawati, Wahyu Dian; Kurniawan, Budhy
Omega: Jurnal Fisika dan Pendidikan Fisika Vol 3 No 2 (2017)
Publisher : Program Studi Pendidikan Fisika UHAMKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31758/OmegaJPhysPhysEduc.v3i2.47

Abstract

This paper reports the process and the results are supplemented by material microwave absorber characterisation \ce {La_{0.67}Sr_{0.33}Mn_{0.8}Ni_{0.2}O3} which has been synthesised by sol gel method. Results refinement of the XRD data showed that the material \ce {La_{0.67}Sr_{0.33}Mn_{0.8}Ni_{0.2}O3} have formed a single phase. From the results of using the software refinement High Score obtained crystal size on sample of 21.18 nm. Number of spin concentration in the sample at ESR test results showed a decrease when doping Ni increased, the area under the curve of absorption decreases as 388.718. This is due to the substitution of \ce {Ni^{2+}} ions \ce {Mn^{3+}} ions thus inhibiting electron hopping of electrons $\mathrm{e_g}$ (\ce {Mn^{3+}} ion) to $\mathrm{t_{2g}}$ (\ce {Mn^{4+}} ion) in the mechanism of double exchange so that the spin of the electrons will $\mathrm{t_{2g}}$ antiparallel. Competition between ferromagnetic properties with antiferromagnetic spin make will change the direction so that the sample magnetisation will decrease and the magnetic moments become random. ESR results are used to confirm the results of the VNA. Microwave absorption ability is indicated by the value of reflection loss on the sample is $-66.67$ dB.
SIFAT MAGNETIK MATERIAL LA0,6BA0,4MNO3 DARI LAMNO3 DAN BAMNO3 MENGGUNAKAN METODE KOMBINASI SOL-GEL DAN SOLID STATE Kurniawan, Budhy; Saadah, Nelis; Jumaeri, Jumaeri; Putri, Witha Berlian; Munazat, Dicky
Indonesian Journal of Chemical Science Vol 9 No 1 (2020)
Publisher : Universitas Negeri Semarang

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Abstract

Perovskite manganite is a manganese oxide-based magnetic material with the basic structure of AMnO3. Interactions between structures and electron transport of materials are studied of the substitution at position A. Perovskite material has interesting physical properties, such as magnetoresistance and magnetocaloric. The goal of research is to study the magnetic properties La0,6Ba0,4MnO3 from single-phase LaMnO3 and BaMnO3 compounds by combination sol-gel and solid state methods. Synthesis of LaMnO3 and BaMnO3 compounds using gel sol methods. The synthesis of La0,6Ba0,4MnO3 using solid state method, that is by mixing LaMnO3 and BaMnO3 powder mechanically and sintering at 1000º C for 24 hours. The characterization magnetic properties of La0,6Ba0,4MnO3 using Vibrating Sample Magnetometer indicate that the material is paramagnetic classified as soft-magnetic.
Sifat Magnetik Material La0,6Ba0,4MnO3 dari LaMnO3 dan BaMnO3 Menggunakan Metode Kombinasi Sol-Gel dan Solid State Saadah, Nelis; Jumaeri, Jumaeri; Putri, Witha Berlian; Munazat, Dicky; Kurniawan, Budhy
Indonesian Journal of Chemical Science Vol 9 No 1 (2020)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/ijcs.v9i1.33816

Abstract

Perovskite manganite is a manganese oxide-based magnetic material with the basic structure of AMnO3. Interactions between structures and electron transport of materials are studied of the substitution at position A. Perovskite material has interesting physical properties, such as magnetoresistance and magnetocaloric. The goal of research is to study the magnetic properties La0,6Ba0,4MnO3 from single-phase LaMnO3 and BaMnO3 compounds by combination sol-gel and solid state methods. Synthesis of LaMnO3 and BaMnO3 compounds using gel sol methods. The synthesis of La0,6Ba0,4MnO3 using solid state method, that is by mixing LaMnO3 and BaMnO3 powder mechanically and sintering at 1000º C for 24 hours. The characterization magnetic properties of La0,6Ba0,4MnO3 using Vibrating Sample Magnetometer indicate that the material is paramagnetic classified as soft-magnetic.
Co-Authors - Jumaeri Laksanawati, Wahyu Dian Munazat, Dicky Putri, Witha Berlian Saadah, Nelis