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SK kinerja mengajar dosen siskom smt genap 2019/2020
No full textSK kinerja mengajar dosen siskom smt genap 2019/202
PENETAPAN PENAMBAHAN DAN PERUBAHAN PERSONALIA PENGELOLA DAN MITRA BESTARI JURNAL PETERNAKAN INDONESIA (JPI) FAKULTAS PETERNAKAN UNIVERSITAS ANDALAS 2017-2021
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Other Properties and Presentation of Group from Kronecker Product on the Representation Quaternion Group
Get PDFThe group was obtained by apply Kronecker product on the demonstration of the quaternion group
is a finite group with 32 order. The elements of this group are 4 × 4 matrices and the group is a
non-abelian. In the first results, it’s presented that the group was a solvable group. In this paper,
other properties will be presented and will also be given a presentation of the group. This property is
associated with a series normal subgroup and the cyclic subgroup. It’s shown that the presentation
of group have 4 generators and 5 relations
Investigation on structure, dielectric and magnetic properties of the four-layer Aurivillius phase Pb1-xBi3.5þxNd0.5Ti4-xMnxO15 prepared via molten salt method
Get PDFIn this study, the four-layer Aurivillius phases, Pb1-xBi3.5þxNd0.5Ti4-xMnxO15 (x ¼ 0, 0.1, 0.3, and 0.5), were prepared by the molten salt method, in order to investigate the effects on crystal structure, morphology, dielectric and magnetic properties of varying x composition. XRD patterns revealed that of the all samples were single-phase products with an orthorhombic structure. The refinement result demonstrates a compressive unit cell volume with increasing x composition. Moreover, FTIR spectroscopy showed a single mode of BO6 octahedra, and the shifting of this mode indicates that the Mn3þ ions occupy the perovskite B-site. The anisotropic plate-like grain was probed by SEM, the size of which showed an increase with a higher x composition, as the proportion of Bi3þ increases. The dielectric properties also increase with an increasing x composition, which results from the increasing structural distortion and grain size. The investigation of the magnetic properties indicates that the ferromagnetic behavior for the x ¼ 0.5 sample, presumably originated from the double-exchange interactions between Mn3þ and Mn4þ and the spin canting of distorted Mn(1)O6 octahedra via the Dzyaloshinskii–Moriya interaction. The formation of the mixed-valent Mn3þ/Mn4þ could likely be caused by the oxidizing environment, produced by the oxobasicity properties of the sulfate salt in this molten-salt method. Therefore, the multiferroic properties exhibited at room temperature were due to the optimum dielectric and magnetic properties that were obtained at x ¼ 0.5.
Keywords:
Aurivillius phase
Molten salt method
Dielectric properties
Magnetic properties
Double-exchange interactio
