Giant magnetoresistance of manganese oxides with a layered perovskite structure

Moritomo, Y.; Asamitsu, A.; Kuwahara, H.; Tokura, Y.

doi:10.1038/380141a0

Cited by 1,238 publications

(817 citation statements)

References 16 publications

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“…Perovskites (ABO 3 ) are a prominent topic of research in materials science (high-T c -electric conductor [1], ferroelectric [2] or high k dielectric [3], or magnetoresistance [4] material). Doping of these perovskites with multivalent cations on the A-and B-sites can lead to the simultaneous occurrence of ionic and electronic conductivities.…”

Section: Introductionmentioning

confidence: 99%

In situ high temperature X-ray diffraction studies of mixed ionic and electronic conducting perovskite-type membranes

et al. 2005

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Section: Introductionmentioning

confidence: 99%

In situ high temperature X-ray diffraction studies of mixed ionic and electronic conducting perovskite-type membranes

et al. 2005

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“…[1][2][3][4][5][6] Nanostructures (nanoparticles, nanowires, and nanobelts) of complex oxides have attracted much attention because of their size-induced novel properties. Although some synthesis methods are successful for fabricating single-cation oxide nanocrystals, [7][8][9][10][11][12][13][14] only a limited amount of work is available for synthesizing nanostructures of complex oxides (with two or more types of cations) because of difficulties in controlling the composition, stoichiometry, and/or crystal structure.…”

mentioning

confidence: 99%

“…At the same time, BaCl 2 reacts with hydroxide to form Ba(OH) 2 , which is dissolved in the hydroxide solution:…”

mentioning

confidence: 99%

Composite-Hydroxide-Mediated Approach for the Synthesis of Nanostructures of Complex Functional-Oxides

2006

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We demonstrate a generic approach for the synthesis of single-crystal complex oxide nanostructures of various structure types, such as perovskites, spinels, monoclinic, corundum, CaF 2 structured, tetragonal, and even metal hydroxides. The method is based on a reaction between a metallic salt and a metallic oxide in a solution of composite-hydroxide eutectic at ∼200°C and normal atmosphere without using an organic dispersant or capping agent. The synthesis technique is cost-effective, one-step, easy to control, and is performed at low temperature and normal atomospheric pressure. The technique can be expanded to many material systems, and it provides a general, simple, convenient, and innovative strategy for the synthesis of nanostructures of complex oxides with important scientific and technological applications in ferroelectricity, ferromagnetism, colossal magnetoresistance, fuel cell, optics, and more.Complex oxides with structures such as perovskite, spinel, and garnet have many important properties and applications in science and engineering, such as ferroelectricity, ferromagnetism, colossal magnetoresistance, semiconductors, luminance, and optoelectronics. 1-6 Nanostructures (nanoparticles, nanowires, and nanobelts) of complex oxides have attracted much attention because of their size-induced novel properties. Although some synthesis methods are successful for fabricating single-cation oxide nanocrystals, 7-14 only a limited amount of work is available for synthesizing nanostructures of complex oxides (with two or more types of cations) because of difficulties in controlling the composition, stoichiometry, and/or crystal structure. The existing techniques rely on high pressure, salt-solvent-mediated high temperature, surface-capping agent, or organometallic precursormediated growth process, 15-24 and the types of oxides that can be synthesized are rather limited. Therefore, seeking a simple approach for low-cost, lower-temperature, large-scale, controlled growth of oxide nanostructures at atmospheric pressure is highly desired, and it is important for exploring zero-and one-dimensional complex oxide-based nanostructures for applications in nanodevices and nanosystems.Here we report a general and widely applicable approach for the synthesis of complex oxide nanostructures of scientific and technological importance. The method is based on a reaction between a metallic salt and a metallic oxide in a solution of molten mixed potassium hydroxide and sodium hydroxide eutectic at ∼200°C and normal atmosphere without using an organic dispersant or capping agent. This methodology provides a one-step, convenient, low-cost, nontoxic, and mass-production route for the synthesis of nanostructures of functional oxide materials of various structure types.We now use the synthesis of two families of complex oxides, perovskite (ABO 3 ; A x A′ 1-x BO 3 ; AB x B′ 1-x O 3 ) 25 and spinel (AB 2 O 4 ), to illustrate the principle and applications of the approach. The sources of A and A′ cations are from metallic salts, ...

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“…1 Interestingly, the magnetic measurements on the manganate Ba 6 Mn 5 O 16 revealed a broad T N and a noticeable Curie tail in the magnetic susceptibility [8]. These magnetic characteristics of the broad T N , as well as the appearance of the Curie tail (which could be related to the uncoupled end chain spins) in the susceptibility, indicate that some structural defects such as intergrowth faults could exist in the material since magnetoresistance properties strongly depend on the number of octahedra that stack in a perovskite block [17]. However, no detailed microstructure analysis has been carried out on this layered compound.…”

Section: Introductionmentioning

confidence: 96%

Synthesis and atom-scale microstructure of Ba6Mn5O16

Yang

et al. 2006

Journal of Physics and Chemistry of Solids

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Giant magnetoresistance of manganese oxides with a layered perovskite structure

Cited by 1,238 publications

References 16 publications

In situ high temperature X-ray diffraction studies of mixed ionic and electronic conducting perovskite-type membranes

In situ high temperature X-ray diffraction studies of mixed ionic and electronic conducting perovskite-type membranes

Composite-Hydroxide-Mediated Approach for the Synthesis of Nanostructures of Complex Functional-Oxides

Synthesis and atom-scale microstructure of Ba6Mn5O16

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