New Gd3+ and Mn2+-Co-Doped Scheelite-Type Ceramics—Their Structural, Optical and Magnetic Properties

• Published in: International journal of molecular sciences Vol. 23; no. 24; p. 15740
• Main Authors: Fuks, Hubert, Kochmański, Paweł, Tomaszewicz, Elżbieta
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 12.12.2022; MDPI
• Subjects: Antiferromagnetism; calcium molybdate; Ceramics; Crystal lattices; Dielectric properties; EPR spectroscopy; Grain size; High temperature; Lasers; Magnetic properties; Magnetic resonance imaging; Manganese ions; Mn2+ and Gd3+ ions; Nanomaterials; Scheelite; scheelites; Solid solutions; Temperature; Tomography; Tungstates; UV-vis spectroscopy
• ISSN: 1422-0067; 1661-6596; 1422-0067
• DOI: 10.3390/ijms232415740

New Gd3+- and Mn2+-co-doped calcium molybdato-tungstates with the chemical formula of Ca1−3x−yMny▯xGd2x(MoO4)1−3x(WO4)3x (labeled later as CaMnGdMoWO), where ▯ denotes vacant sites in the crystal lattice, 0 < x ≤ 0.2500 and y = 0.0200 as well as 0 < y ≤ 0.0667 and x = 0.1667 were successfully synthesized by high-temperature solid-state reaction method and combustion route. Obtained ceramic materials crystallize in scheelite-type structure with space group I41/a. Morphological features and grain sizes of powders under study were investigated by SEM technique. Spectroscopic studies within the UV-vis spectral range were carried out to estimate the direct band gap (Eg) and Urbach energy (EU) of obtained powders. EPR studies confirmed the existence of two types of magnetic objects, i.e., Mn2+ and Gd3+ ions, and significant antiferromagnetic (AFM) interactions among them.