Crystal Structure of Zinc Calcium Oxysulfide

Петрова, С. А.; Mar'evich, V. P.; Захаров, Р. Г.; Selivanov, E. N.; Chumarev, V. M.; Udoeva, L. Yu.

doi:10.1023/b:doch.0000003458.35866.40

Cited by 46 publications

(32 citation statements)

References 2 publications

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“…14 Here, we will make comparisons with the energy schemes between these two different hosts to explain differences observed in the optical spectra. The main differences are as follows: (i) CaZnOS is an intermediate band gap semiconductor with a direct band gap of 4.3 eV (E VC, CZOS ¼ 4.3 eV); 6 however, CaAlSiN 3 has an indirect band gap (E VC, CASN ¼ 5.3 eV), 20 which is larger than that of CaZnOS; (ii) Eu is present as a divalent ion in both CaZnOS and CaAlSiN 3 , which has been demonstrated by the absence of sharp f-f line emissions of Eu 3þ . However, the thermal quenching of Eu 2þ 5d-4f luminescence in CaAlSiN 3 ((I 150 C /I RT ) CASN ¼ 0.9) 21 is stronger than that in CaZnOS ((I 150 C /I RT ) CZOS ¼ 0.3).…”

Section: G Construction and Discussion Of The Energy Level Diagram Omentioning

confidence: 99%

Photoluminescence properties and energy levels of RE (RE = Pr, Sm, Er, Tm) in layered-CaZnOS oxysulfide

Zhang

Feng

Chen

et al. 2013

Journal of Applied Physics

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Vacuum ultraviolet spectroscopic properties of rare earth ( RE = Ce , Tb , Eu , Tm , Sm ) -doped hexagonal K Ca Gd ( P O 4 ) 2 phosphate RE 3þ (RE ¼ Pr, Sm, Er, Tm)-activated CaZnOS samples were prepared by a solid-state reaction method at high temperature, and their photoluminescence properties were investigated. Doping with RE 3þ (RE ¼ Pr, Sm, Er, Tm) into layered-CaZnOS resulted in typical RE 3þ (RE ¼ Pr, Sm, Er, Tm) f-f line absorptions and emissions, as well as the charge transfer band of Sm 3þ at about 3.3 eV. The energy level scheme containing the position of the 4f and 5d levels of all divalent and trivalent lanthanide ions with respect to the valence and conduction bands of CaZnOS has been constructed based on the new data presented in this work, together with the data from literature on Ce 3þ and Eu 2þ doping in CaZnOS. The detailed energy level scheme provides a platform for interpreting the optical spectra and could be used to comment on the valence stability of the lanthanide ions in CaZnOS. V C 2013 AIP Publishing LLC. [http://dx.

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Section: G Construction and Discussion Of The Energy Level Diagram Omentioning

confidence: 99%

Photoluminescence properties and energy levels of RE (RE = Pr, Sm, Er, Tm) in layered-CaZnOS oxysulfide

Zhang

Feng

Chen

et al. 2013

Journal of Applied Physics

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“…The Rietveld refinements jointly performed on corresponding neutron powder diffraction (NPD) data point also toward a stoichiometric CaOFeS composition that is isostructural to that of the CaOZnS polar structure. 6,7 The CaOFeS compound exhibits a semiconducting behavior and, in addition, the thermal dependence of the dielectric permittivity has been measured at low temperature.…”

Section: And References Cited Therein)mentioning

confidence: 99%

Magnetodielectric Effect in Crystals of the Noncentrosymmetric CaOFeS at Low Temperature

et al. 2015

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Single crystals of the stoichiometric iron calcium oxysulfide CaOFeS have been grown by a solid-state reaction. Structural analysis of CaOFeS at room temperature by combining single-crystal X-ray diffraction data and transmission electron microscopy leads to a stoichiometric hexagonal noncentrosymmetric P63mc layered structure isostructural to CaOZnS. It is built from alternating layers made of FeOS3 tetrahedra sharing sulfur apexes and stacked with Ca(2+) planes. All Fe-O bonds are parallel to the stacking axis; this breaks the centrosymmetry, leading to a polar structure. The dielectric measurements reveal the existence of a magnetodielectric effect near 33 K in good agreement with the Neel temperature, as evidenced near 35 K by specific heat measurements reported by a different group.

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“…This novel quaternary oxysulde was rst reported. 16 Later on, Igiehon and coworkers 17,18 tried to explore the products of carbothermal reduction of iron and zinc suldes and to determine the crystal structures of CaZnOS and CaFeOS. In 2003, Petrova et al rened the lattice parameters and determined the space group of this zinc calcium oxysulde using the Rietveld prole analysis method.…”

Section: Introductionmentioning

confidence: 99%

Enhanced persistent properties of Mn²⁺ activated CaZnOS

Zheng

Zhang

et al. 2017

RSC Adv.

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The red emitting CaZnOS:Mn 2+ long persistent phosphor was successfully prepared via a conventional high-temperature solid-state reaction method. The persistent luminescence emission of Mn 2+ -dopedCaZnOS phosphor was investigated for the first time. Rare-earth trivalent ions were used as co-dopants to obtain a brighter red afterglow and longer persistence time. The optical properties of the as-prepared samples have been investigated systematically by employing photoluminescence spectroscopy, persistent luminescence spectroscopy, afterglow decay curves and thermoluminescence curves. In light of the experimental results of this study, a possible mechanism of persistent luminescence was illustrated and discussed in detail. These investigations provide a new and efficient long persistent phosphor.

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Crystal Structure of Zinc Calcium Oxysulfide

Cited by 46 publications

References 2 publications

Photoluminescence properties and energy levels of RE (RE = Pr, Sm, Er, Tm) in layered-CaZnOS oxysulfide

Photoluminescence properties and energy levels of RE (RE = Pr, Sm, Er, Tm) in layered-CaZnOS oxysulfide

Magnetodielectric Effect in Crystals of the Noncentrosymmetric CaOFeS at Low Temperature

Enhanced persistent properties of Mn²⁺ activated CaZnOS

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Crystal Structure of Zinc Calcium Oxysulfide

Cited by 46 publications

References 2 publications

Photoluminescence properties and energy levels of RE (RE = Pr, Sm, Er, Tm) in layered-CaZnOS oxysulfide

Photoluminescence properties and energy levels of RE (RE = Pr, Sm, Er, Tm) in layered-CaZnOS oxysulfide

Magnetodielectric Effect in Crystals of the Noncentrosymmetric CaOFeS at Low Temperature

Enhanced persistent properties of Mn2+ activated CaZnOS

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Enhanced persistent properties of Mn²⁺ activated CaZnOS