Study on Influence of Ca2+ Ions Doping at a Site on Magnetic Properties and Magnetocaloric Effect of Nominal Compositions La1.4Sr1.6-xCaxMn2O7

Yun Zong; Di Kang

doi:10.4028/www.scientific.net/AMR.1120-1121.406

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 1120-1121Study on Influence of Ca2+ Ions Doping at a Site...

Study on Influence of Ca²⁺ Ions Doping at a Site on Magnetic Properties and Magnetocaloric Effect of Nominal Compositions La_1.4Sr_1.6-xCa_xMn₂O₇

Abstract:

Polycrystalline layered perovskite manganese oxides La_1.4Sr_1.6-xCa_xMn₂O₇ (x=0,0.2,0.4,0.8,1.0,1.4,1.6) samples is prepared using solid state reaction.The XRD analysis shows that La_1.4Sr_1.6-xCa_xMn₂O₇ (0 ≤ x ≤ 0.8) samples are Sr3Ti₂O₇-type tetragonal structure with space group I4/mmm and forms a layered perovskite structure; for the 1.0≤ x ≤1.6 series of samples the main phase is ABO₃ type orthorhombic structure with space group Pbnm.For small amount of Ca²⁺ ion-doped sample (x = 0.2,0.4), induce serious Jahn-Teller(J-T) distortion of MnO₆ octahedral.For a large number of doping (1.0≤ x ≤1.6) samples, ferromagnetic - paramagnetic transition occurs near the Curie temperature (T_c) from low to high temperatures.With increasing doping amount, the magnetization reached maximum at x=1.4 samples.Maximum magnetic entropy change of the three samples(x=1.0,1.4,1.6) reaches 0.84, 1.20 and 2.28 J kg^-1 K^-1 at 320,268 and 215K near the Curie temperature, respectively. The large magnetic entropy change effect under low magnetic field of the sample makes it an optimal candidate of room temperature magnetic refrigeration materials.

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Periodical:

Advanced Materials Research (Volumes 1120-1121)

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406-413

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.1120-1121.406

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Online since:

July 2015

Authors:

Yun Zong, Di Kang

Keywords:

Layered Perovskite Manganites, Magnetic Entropy Change, Magnetic Properties, Solid-State Reaction

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