Cost effective way of tuning physical properties of MgAl2O4 spinel nanomaterials by Sr+2/ Mn2+ cations doped at the T-Sites. Issue 8 (1st June 2020)

• Record Type: Journal Article
• Authors: Shahid, Farkhanda; Ismail, Bushra; Khan, Asad Muhammad; Ain, Qurat Ul; Khan, Rafaqat Ali; Shah, Faheem; Fazal, Tanzeela; Asghar, Muhammad Nadeem
• Is Part Of: Ceramics international. Volume 46:Issue 8(2020)Part A
• Page Start: 10710
• Page End: 10717
• Publication Date: 2020-06-01
• Subjects: MgAl2O4 -- Luminescence -- Spinel -- Optical properties -- Antisite defects; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2020.01.078
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The oxide host systems in use to date have very complicated crystalline phases and obtaining the pure phase requires specific synthesis procedures and high temperatures. Secondly, the expensive and bigger rare earth ions add up to the additional costs and their accommodation in the lattice becomes a difficult task. This leads to the deterioration of the properties of host material due to the formation of secondary phases. The current project aims at the synthesis and study of the physical properties of dielectric spinel magnesium aluminate host doped at tetrahedral sites with Sr 2+ /Mn 2+ as an alternative simple and cost-effective oxide host. Mg1-x Srx Al2 O4 (x = 0.0–1.0) and Sr 2+ /Mn 2+ co-doped derivatives having general formula Mg1-x-y Srx Mny Al2 O4 (x = 0.1–0.7, y = 0.1) were prepared and studied. X-ray diffraction analysis shows a random distribution of Sr 2+ at both the T- and O-sites of spinel lattice. Subsequent oxygen vacancies, empty lattice sites and antisite defects make these materials very promising luminescent materials having variety of optical centres to play with. UV–Vis spectra showed maximum absorption at 220 nm, whereas a broad emission band ranged between 350-550 nm with high intensity peak at 436 nm and two shoulders at 417 and 465 nm is observed when excited at 320 nm. The coordination environment of the optical centres is also affected by the Mn 2+ /Sr 2+ doping resulting in blueshift in the absorbance band. Transition of color from greenish-blue to blue is observed on account of Mn 2+ doping in Mg1-x Srx Al2 O4 materials.