Abstract
In this work, NH4MPO4.H2O (M = Mn2+, Fe2+, Co2+, Cu2+) microstructures were synthesized by a simple precipitation method at room temperature without any templates or surfactants. The materials were characterized by means of thermogravimetric analysis (TGA), differential scanning calorimetric method (DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray absorption spectroscopy (XAS), and X-ray photoelectron spectroscopy (XPS). The characterization results show that the prepared samples have an orthorhombic structure for M = Mn2+, Fe2+, Co2+ samples without any impurity phase, whereas the monoclinic structure is presented in the NH4CuPO4.H2O sample. The morphology of all the obtained samples completely consists of a plate-like shape with the size of several micrometers. In addition, the microflower-like morphology with size about 10 µm was obtained when the metal was Mn. The oxidation state of P ions in all samples is 5 + which is consistent with the surface analysis using XPS. For the magnetic properties, the obtained materials show antiferromagnetic behavior with the highest magnetization value of 26.17 emu.g−1 at 10 kOe in the NH4MnPO4.H2O sample. By using inductively coupled plasma atomic emission spectroscopy (ICP-OES), the ion release properties of NH4MPO4.H2O (M = Mn2+, Fe2+, Co2+, Cu2+) microstructures show the potential application as slow-release fertilizer. This could be beneficial in order to reduce the amount of fertilizer used in plants and may be extended for the commercial.
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Acknowledgements
The authors would like to thank Suranaree University of Technology (SUT) and the SUT-NANOTEC RNN on Nanomaterials and Advanced Characterizations and the SUT Center of Excellence on Advanced Functional Materials, Suranaree University of Technology, Nakhon Ratchasima, Thailand, for providing XRD, TEM facilities, and financial support. S. Phumying is supported by SUT-PhD Fund. The authors would like to thank Synchrotron Light Research Institute (Public Organization), Nakhon Ratchasima, Thailand, for XANES and XPS facilities.
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Phumying, S., Sichumsaeng, T., Sonsupap, S. et al. Synthesis, characterization, magnetic and ion release properties of NH4MPO4.H2O (M = Mn2+, Fe2+, Co2+, Cu2+) prepared by a simple precipitation method in water solution. Appl. Phys. A 127, 352 (2021). https://doi.org/10.1007/s00339-021-04492-y
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DOI: https://doi.org/10.1007/s00339-021-04492-y