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- W2044330189 abstract "Abstract Experimental results of electron paramagnetic resonance spectra, X-ray diffraction, scanning electron microscopy and infrared spectroscopy demonstrate that the kinetic of the physical and chemical processes that takes place during prolonged intensive mechanical processing (MP, 0 t MP > 3120 min ) of powder mixtures of 50%wt ZnO+50%wt MnO2 can be described as a three stage process. (1) 0 t MP > 30 min , particles destruction, formation of superficial defects, fast increment of sample average temperature (from 290 to ∼ 600 K ) and annealing of defects with the lowest energy of activation Eac. (2) 30 t MP > 390 min , further particle destruction, slow increment of sample average temperature (from ∼ 600 to ∼ 700 K ), formation and growth of a very disordered layer of β ‐ MnO 2 around ZnO particles, dehydration of MnO2, formation of solid solution of Mn2+ ions in ZnO, formation of nano-quasiamorphous states in the ZnO–MnO2 mixture and onset of the formation of the ZnMnO3 phase. (3) 390 t MP > 3120 min , the sample average temperature remains constant ( ∼ 700 K ), the reaction is completed and the spinel ZnMnO3 phase with a unit cell a=8.431(1) A and space group Fd 3 ¯ m is the only phase present in the sample. No ferromagnetism at room temperature was detected in this study." @default.
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- W2044330189 date "2011-10-01" @default.
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- W2044330189 title "Kinetics of physico-chemical processes during intensive mechanical processing of ZnO–MnO2 powder mixture" @default.
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- W2044330189 doi "https://doi.org/10.1016/j.jmmm.2011.04.019" @default.
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