Otro
Intrinsic magnetic properties of BixCo2-xMnO 4 spinels obtained by short-time etching
Registro en:
Journal of Magnetism and Magnetic Materials, v. 339, p. 157-162.
0304-8853
10.1016/j.jmmm.2013.02.047
WOS:000318904100028
2-s2.0-84876815397
Autor
Dos Santos, M. E.
Lisboa Filho, Paulo Noronha
Gouttefangeas, F.
Peña, O.
Resumen
We report the structural and magnetic properties of Co2MnO 4, partially substituted by Bi at the octahedral site. Bismuth enhances ferromagnetism due to a decrease of the Co2+-Co2+ antiferromagnetic interactions and an increase of the Mn3+-Mn 4+ exchanges. Spurious phases (magnetic and/or nonmagnetic oxides) can easily form because of the large differences between the ionic radii of Bi3+ and Co3+, hiding or altering the intrinsic physical properties of the main BixCo2-xMnO4 phase. An easy way to eliminate the secondary phases is using acid reagents. Short-time etching of Bi0.1Co1.9MnO4 using nitric acid was successfully used, keeping most of the properties of the initial compound, with no alteration of the crystallographic structure. Final stoichiometry was respected (∼Bi0.08Co1.82MnO4), meaning that the material after etching definitely contains bismuth elements in its structure and the observed properties are intrinsic to the oxide spinel. Additional experiments were performed as a function of the synthesis conditions, showing that an optimal pH value of 7 allowed the best magnetic response of the non-doped material. © 2013 Elsevier B.V. All rights reserved.
Materias
Ítems relacionados
Mostrando ítems relacionados por Título, autor o materia.
-
Crustal structure of the eastern part of the Maya Terrane from magnetic anomalies and magnetic power spectrum inversion
García-Abdeslem, J.; Ness, G. E. -
Crustal structure from 2-D gravity and magnetic data modeling, magnetic power spectrum inversion, and seismotectonics in the Laguna Salada basin, northern Baja California, Mexico
García-Abdeslem, Juan; CICESE (Centro de Investigación Científica y de Educación Superior de Ensenada), División de Ciencias de la Tierra, km 107, Carretera Tijuana-Ensenada, Ensenada, Baja California, 22860 México.; Espinosa-Cardeña, Juan Manuel; CICESE (Centro de Investigación Científica y de Educación Superior de Ensenada), División de Ciencias de la Tierra, km 107, Carretera Tijuana-Ensenada, Ensenada, Baja California, 22860 México.; Munguía-Orozco, Luis; CICESE (Centro de Investigación Científica y de Educación Superior de Ensenada), División de Ciencias de la Tierra, km 107, Carretera Tijuana-Ensenada, Ensenada, Baja California, 22860 México.; Wong-Ortega, Víctor Manuel; CICESE (Centro de Investigación Científica y de Educación Superior de Ensenada), División de Ciencias de la Tierra, km 107, Carretera Tijuana-Ensenada, Ensenada, Baja California, 22860 México.; Ramírez-Hernández, Jorge; UABC (Universidad Autónoma de Baja California), Instituto de Ingeniería, Mexicali, B. C., México. -
Magnetic field and plasma parameters for magnetic clouds in the interplanetary medium
Dal Lago, A. Armando; Gonzalez, W. D.; C. de Gonzalez, A. L.; Tsurutani, B. T.