Keywords
magnetic measurements
microstructure
Mössbauer spectra
nickel zinc orthostannates
self-propagating high-temperature synthesis
SHS
X-ray diffraction
XPS
Abstract
Zinc orthostannate (Zn2SnO4) and nickel zinc orthostannate (Zn1.2Ni0.8SnO4) were prepared by self-propagating hightemperature synthesis (SHS) and characterized by 119Sn Mössbauer spectroscopy. Both orthostannates are cubic spinels exhibiting defect-induced ferromagnetic behavior due to their microstructures. The Mössbauer spectrum of Zn2SnO4 appears as single unresolved doublet [δ = 0.169(3) mm s–1, Δ = 0.45(1) mm s–1], and in the case of Zn1.2Ni0.8SnO4, partial substitution of zinc by nickel is the cause of the appearance of a second doublet of Sn4+ [δ = 0.44(9) mm s–1, Δ = 1.62(1) mm s–1] due to an increase in the occupancy of the 5s orbital of the corresponding tin atoms and the localization of crystallographic defects near them.
Funders
Ministry of Education and Science of the Russian Federation
122030200324-1