Effect of the sintering temperature of ceramic manganites La0.7Mn1.3O3 ± Δ on their grain sizes, magnetic and electrical properties

Akimov, G. Ya.; Novokhatskaya, A. A.; Prylypko, S. Yu.; Revenko, Yu. F.

doi:10.1134/s1063783412100022

Cited by 6 publications

(2 citation statements)

References 13 publications

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“…The average grain size and average density show a quite stable correlation (Fig. 5), as characteristic for ordinary sintering [10]. In electron beam sintering mode, the grain size can be varied over a rather wide range from 0.7 to 10 µm with a rather small deviation of the average density from 93.6 % to 97.3 %.…”

Section: Resultsmentioning

confidence: 67%

Electron Beam Sintering of Zirconia Ceramics

Бурдовицин

Двилис

Зенин

et al. 2013

AMR

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The work demonstrated the sintering of zirconium dioxide ceramics by means of an electron beam produced by a plasma-cathode e-beam source operating at fore-vacuum pressure. The sintered ceramics consist of tetragonal-modified zirconium dioxide with grain size from 0.7 to 10 micrometers, depending on the sintering conditions. At constant sintering temperature, the density of the material and its grain size depend on the integrated energy injected into the sintered material by the electron beam.

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Section: Resultsmentioning

confidence: 67%

Electron Beam Sintering of Zirconia Ceramics

Бурдовицин

Двилис

Зенин

et al. 2013

AMR

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“…Figure 2c shows a granular morphology limited by grain boundaries, with an average particle size of 1.68 μm. Figure 2b–d also shows, on the surface of some grains, terraces in the form of parallel and equidistant bands, possibly formed by a process of evaporation and condensation (as is the case when crystals grow from the vapor phase) [27,28]. Manganite manufactured by chemical methods have a narrower particle-size distribution, while manganite manufactured by solid-state reaction methods have a wider particle-size distribution, as noted in Figure 3.…”

Section: Resultsmentioning

confidence: 99%

Preparation of La0.7Ca0.3−xSrxMnO3 Manganites by Four Synthesis Methods and Their Influence on the Magnetic Properties and Relative Cooling Power

et al. 2019

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Manganites of the family La0.7Ca0.3−xSrxMnO3 were fabricated by four preparation methods: (a) the microwave-assisted sol-gel Pechini method; (b) sol-gel Pechini chemical synthesis; (c) solid-state reaction with a planetary mill; and (d) solid-state reaction with an attritor mill, in order to study the effect of the preparation route used on its magnetocaloric and magnetic properties. In addition, the manganites manufactured by the Pechini sol-gel method were compacted using Spark Plasma Sintering (SPS) to determine how the consolidation process influences its magnetocaloric properties. The Curie temperatures of manganites prepared by the different methods were determined in ~295 K, with the exception of those prepared by a solid-state reaction with an attritor mill which was 301 K, so there is no correlation between the particle size and the Curie temperature. All samples gave a positive slope in the Arrot plots, which implies that the samples underwent a second order Ferromagnetic (FM)–Paramagnetic (PM) phase transition. Pechini sol-gel manganite presents higher values of Relative Cooling Power (RCP) than the solid-state reaction manganite, because its entropy change curves are smaller, but wider, associated to the particle size obtained by the preparation method. The SPS technique proved to be easier and faster in producing consolidated solids for applications in active magnetic regenerative refrigeration compared with other compaction methods.

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