We report the synthesis of LaCr1xMnxO3 (x = 0.1, 0.2, and 0.3) single crystal microcubes via a mild hydrothermal method. The as-synthesized LaCr1xMnxO3 samples were crystallized into the Pnma space group with uniform particle size and cubic morphology. The lattice parameters increased as the doping level of Mn increased from x = 0.1 to 0.3. XPS characterization of the samples showed that the valence states of Cr and Mn are both +3. A temperature-dependent magnetization study indicated a clear transition point of canted-antiferromagnetic to paramagnetic behaviour from 3380 K, with their Neel transition points located between 246265 K. The isothermal magnetic hysteresis of the LaCr1xMnxO3 samples show that they possess the same coercive field strength but a linear increment of remnant magnetization with increasing Mn doping level. A temperature-dependent magnetic entropy change study indicated that the samples show a maximum S of 0.4247 J kg1 K1 for LaCr0.7Mn0.3O3 at 40 K for H = 6 T. Arrott plots of M2versus H/M indicate a second-order magnetic phase transition for all of the as-synthesized LaCr1xMnxO3 samples. All these results suggest that the promotion of magnetization was successfully performed by hydrothermally doping Mn in a LaCrO3 lattice. This study provides a design and synthesis strategy to increase the ferromagnetic exchange in weak magnetization materials.
CrystEngComm – Royal Society of Chemistry
Published: May 11, 2018
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