Structural and Spectroscopic Characterization of Tb3+‐Doped MgAl2O4 Spinel Ceramics Fabricated by Spark Plasma Sintering Technique. Issue 8 (23rd December 2019)

• Record Type: Journal Article
• Authors: Valiev, Damir; Khasanov, Oleg; Dvilis, Edgar; Stepanov, Sergei; Paygin, Vladimir; Ilela, Alfa
• Is Part Of: Physica status solidi. Volume 257:Issue 8(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-12-23
• Subjects: ceramics -- luminescence properties -- magnesium aluminum spinel -- spark plasma sintering technique -- terbium ions; Solid state physics -- Periodicals; Solids -- Periodicals; Atomic structure -- Periodicals; 530.41
• DOI: 10.1002/pssb.201900471
• Languages: English
• ISSNs: 0370-1972

Abstract

Abstract : Spark plasma sintering (SPS) technique is successfully used for the preparation of magnesium aluminate spinel ceramics doped with different concentrations of Tb 3+ ions. Structural, morphological, optical, and photoluminescence (PL) characterization are conducted. It is demonstrated that the redshift in the absorption spectra is possibly due to the energy gap between the valence and conduction bands reducing and the formation of a higher concentration of nonbridging oxygen with an increase in the concentrations of Tb 3+ ions in MgAl2 O4 ceramics. The PL spectrum excited by nitrogen laser consists of a broad emission band with a maximum at λ em ≈ 400 nm and a series of emission bands in the 400–700 nm spectral range responsible for Tb 3+ ions. In the "blue" spectral region, the complex host centers such as oxygen vacancies are recorded. An increase in the terbium ion concentration does not lead to the effect of concentration quenching. Luminescence decay kinetics analysis for all ceramics samples is performed. The effect of terbium oxide on the optical, PL properties and luminescence decay kinetics of MgAl2 O4 ceramics is discussed. Abstract : This research is devoted to the preparation of MgAl2 O4 spinel ceramics doped with different terbium concentrations by the spark plasma sintering method. Structural, morphological, optical, and photoluminescence characterization are conducted to gain a deeper insight into the luminescence properties of the spinel ceramics. Luminescence decay kinetics analysis of ceramics is performed.