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- Title
Optical and mechanical stability of Tutton’s salt crystal of Cu<sup>2+</sup> doped ammonium cobalt(II) sulfate hexahydrate.
- Authors
Venkatachalam, N.; Christina Rhoda, J.; Esther Jayanthi, C.; Nagaraja, K. S.; Karnan, C.; Prabhaharan, M.; El-Tayeb, Mohamed A.; Syed, Shaban R. M.
- Abstract
Cu2+ doped ammonium cobalt(II) sulfate hexahydrate (ACSH) crystals were investigated for LED applications. Cu2+ doped ACSH crystals obtained via slow evaporation technique were analyzed for their structural, morphological, optical, thermal, and mechanical properties. The compound formed a crystalline structure within the monoclinic system (P21/a). FTIR and Raman spectral analyses ascertained peaks pertaining to ν(O–H), and ν(N–H) corresponding to NH4+ and M–H2O groups. The presence of N, O, S, Co, and Cu was demonstrated through EDAX. The peaks at 450 and 530 nm are ascribed to the [Co(H2O)6]2+ center due to 4T1g → 4T1g(P) and 4T1g → 4A2g transitions. The photoluminescence spectrum showed a red emission at 778 nm on excitation at 520 nm. The EPR spectrum indicated a strong tetragonal distortion in [Cu(H2O)6]2+, and the crystal is comprised of a H-bonded structure involving [Co(H2O)6]2+, [Cu(H2O)6]2+, NH4+, and SO42− networks. The TG–DTA–DSC study showed the loss of water molecules and the subsequent decomposition of the compound. The material exhibited a reverse indentation size effect (n = 3.9) according to Kick's law. The mechanical properties, such as microhardness, yield strength, stiffness constant, fracture toughness, and brittleness of the crystal were calculated. The laser-induced damage threshold of the ACSH crystal doped with Cu2+ was determined to be 29.89 GW/cm2, which is superior to those of urea or KDP crystals. The results support that the developed crystal can be effectively employed in light-emitting diode applications.
- Publication
Journal of Materials Science: Materials in Electronics, 2024, Vol 35, Issue 20, p1
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-024-13154-7