Abstract
A novel method, ultra-high pressure sintering (UHPS), for preparing highly-dense La2NiMnO6 (LNMO) ceramic at a ultra-high pressure (4 GPa) and a low sintering temperature (800 °C) over a short duration (10 min) had been developed. TEM images and Rietveld fitted XRD patterns confirmed the coexistence of monoclinic P21/n and hexagonal R3¯ phases in the ceramic. Compared with the samples prepared by conventional sintering, the grain size of the LNMO ceramic obtained by UHPS was remarkably decreased (from 3-10 μm to 300–500 nm) while the relative density was increased significantly (from 65-95% to 98.5%), which could be attributed to the unique UHPS sintering process. It was further noted that the ferromagnetic-paramagnetic transition temperature (TC1 ≈ 277 K) as well as the saturation magnetization (Ms≈3.6 μB/f.u.) were improved due to the denser structure and smaller grain size, as compared with the conventionally sintered LNMO samples.
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