Abstract
A novel chemical passivation route is established to obtain microcrystalline solid solutions of binary oxidé system Mn1−x Ni x O (0·01 <x < 0·30). During the passivation process, controlled thermal decomposition of manganous oxalate is carried out to obtain pure MnO and its subsequent reaction with NiO in oxygen-free nitrogen resulted in microcrystalline powder of these solid solutions. The powder is thoroughly characterized by various physicochemical techniques such as XRD, DTA/TG/DTG, diffused reflectance spectra, magnetic susceptibility, TEM, XPS etc. The observed processing-structure-property correlations confirmed the improved thermal stability of these powders (relative to pure MnO) in air. The important role of dopant paramagnetic Ni2+ ions in enhancing the passivation of the bulk Mn2+ species is explained on the basis of the formation of mixed oxide complex species on the surface of these microcrystalline powders.
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References
Aviazov M I and Gurov S C 1974Inorg. Mater. (USA) 10 738
Bakare P P, Gunjikar V G, Deshpande C E and Date S K 1991J. Mater. Sci. 26 484
Barret C A and Evans E B 1964J. Am. Ceram. Soc. 47 533
Carr M J 1985J. Elec. Micr. Tec. 2 439
Carver J C, Schweitzer G K and Curlson T A 1972J. Chem. Phys. 57 973
Cheetham A K and Hope D A O 1983Phys. Rev. B27 6964
Deshpande C E, Badrinarayanan S and Date S K 1985J. Mater. Sci. Lett. 4 922
Deshpande C E, Bakare P P, Murthy M N S, Vasanthacharya N Y and Ganguly P 1982Proc. Indian Acad. Sci. (Chem. Sci.) 91 261
De Boer D K G, Hass C and Sawatzky G A 1982Phys. Rev. B29 4401
Fadley C E and Shirley D D 1970Phys. Rev. A2 1109
Foord J E, Jackman R b and Allen G C 1984Philos. Mag. A49 657
Goodenough J B 1963Magnetism and the chemical bond (New York: Wiley Intersci.)
Hahn W C and Muan A 1961J. Phys. Chem. Solids 19 338
Kaelble S T (ed.) 1967Handbook of X-rays (New York: McGraw Hill) pp. 12–21
Katsumata K, Kobayashi M, Sato T and Miyata Y 1979Phys. Rev. (USA) B19 2700
Kim K S and Ninoguard N 1974Surface Sci. 43 625
Lever A P B 1984Inorganic electronic spectroscopy (Amsterdam: Elsevier) 2nd edn, p. 507
Murthy M N S, Deshapnde C E and Shrotri J J 1978Proc. Indian Acad. Sci. A87 49
Oku M, Nirokawa K and Ikeda S 1975J. Elect. Spectrosc. Rel. Phen. 7 465
Pratt C W and Coelho R 1959Phys. Rev. 116 281
Rao C N R and Subbarao G V 1974Transition metal oxides, Nat. Stand. Data Ser. (US: Nat. Bur. Stand.)
Rao C N R, Sarma D D, Vasudevan S and Hegde M S 1979Proc. R. Soc. A367 239
Sidgewick N V 1950Chemical elements and their compounds (Oxford: Clarendon) Vol. II, p. 1283
Tanabe Y and Sugano S 1954J. Phys. Soc. Jpn. 9 753
Vogel A I 1964Quantitative inorganic analysis (London: English Language Book Society) 3rd edn
Wertheim G K, Hufner S and Guggenheim H J 1975Phys. Rev. B71 465
Zhao L Z and Young V 1984J. Elect. Spectrosc. Relat. Phen. 34 45
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Bakare, P.P., Deshpande, C.E., Gunjikar, V.G. et al. Synthesis and study of structural, thermal, optical and magnetic properties of stabilized Mn1−x Ni x O system (0·01 <x < 0·30). Bull. Mater. Sci. 17, 1015–1028 (1994). https://doi.org/10.1007/BF02757578
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DOI: https://doi.org/10.1007/BF02757578