^aChemistry Department, College of Science, King Saud University, P.O. Box

2455, Riyadh 11451, Saudi Arabia.

^bDepartment of Science and Humanities, St. Michael College of Engineering and Technology, Kalaiyarkoil 630551, Tamilnadu, India

^cPG & Research Department of Physics, Paavendhar College of Arts & Science, M. V. South, Attur, Salem 636 121,Tamilnadu, India

^dDepartment of Physics, Anand Institute of Higher Technology, Kazhipattur,

Chennai, 603103, India

^eDepartment of Mechanical Engineering, Hindustan University, Rajiv Gandhi

Salai (OMR), Padur, Kelambakam, Chennai, TamilNadu 603103, India

^fDepartment of Physics, Science and Humanities. SMK Forma Institute of

Technology, Kelambakkam 603 103, India

^gDepartment of Food Science and Biotechnology, Sejong University, Gwangjin- gu, Seoul -05006, South Korea

Zn1-xSrxAl2O4 (0 ≤ x ≤ 0.5) nanoparticles are successfully produced by combustion method. Powder XRD studies confirms the substitution of Sr2+ in ZnAl2O4 spinel nanostructure and average crystallite size lies between 32 to 39 nm. FTIR spectra revealed bands at 710 and 563 cm-1 corresponds to the intrinsic stretching vibrations of Mtetra–O atom which takes place at tetrahedral lattice sites and octahedral metal stretching Moctra–O appears as peak positioned at 498 cm-1. HR-SEM images confirms spherical nanoparticles with agglomerated nature for strontium doped zinc aluminate nanoparticles. The presence of oxygen, aluminium, zinc and magnesium elements were confirmed from EDX spectra.

The band gap of ZnAl2O4 was found to be 5.16 eV and the bandgap increases gradually with the increase in Sr2+ doping concentration. The magnetization plots were determined the super paramagnetic behaviour at room temperature.