Growth Of A Single MnCr2O4 Spinel On Ni-25Cr-1.5Mn Alloy By The Rhines Pack Method and Photoelectrochemical And Raman Signatures of MnCr2O4 Spinel
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A single thin MnCr 2 O 4 spinel layer was synthesized on a Ni-25Cr-1.5Mn alloy by a fine control of oxygen partial pressure using the Rhines pack method, a technique allowing a fine control of the oxygen partial pressure by an appropriate buffering powder mixture. The spinel was characterized using X-Ray Diffraction, Raman spectroscopy and photoelectrochemistry. The cubic spinel MnCr 2 O 4 was formed under the oxygen partial pressure close to 5 x 10 –21 atm. at 1050°C controlled by the buffering Ni-25Cr/Cr 2 O 3 powder mixture. Raman MnCr 2 O 4 spectrum is characterized by 5 vibrational modes whereas photoelectrochemical characterization revealed the MnCr 2 O 4 band gap measurement at 3.7 eV with a n-type conductivity.
