Synthesis, crystal structure and properties of a new calcium-magnesium-monosilicate-chloride, Ca8Mg[(SiO4)4Cl2]

Rondorfite-type structure—XPS and UV–vis study

“…The unit cell parameter derived from the single crystal data of orange rondorfite sample a = 15.079(10) Å was very close to the green one with a = 15.080(10) Å and comparable to previously published data [4,6,28,29,30].…”

“…Pb 2+ , Al 3+ , Cu 2+ , I 2+ [20][21][22][23][24][25]. Thus the synthetic analog of zinc rondorfite Ca 8 Zn(SiO 4 ) 4 Cl 2 [26,27] or magnesium rondorfite Ca 8 Mg(SiO 4 ) 4 Cl 2 [28][29][30] were considered by many authors as a matrix for doping to induce fluorescence effect. The strong luminescence emission in green light range has become a motivation for further investigation of the potential luminescent material (phosphor) for production of a new type of LEDs [8][9][10][11][12].…”

Synthesis and Hydration Characteristics of Alinite Cement

“…However, the evaporation of Cl Ϫ ions in the clinckering process and the higher capacity for isomorphic substitution make it difficult to determine the exact chemical composition. 2,12 Various molecular formulas have been proposed, and the optimum amount of chloride addition to the raw mix has been reported to be in the range of 5%-23% of CaCl 2 . 5,9,13,14 It is generally agreed that MgO is essential for alinite formation.…”

Luminescence and Cationic-Size-Driven Site Selection of Eu3+ and Ce3+ Ions in Ca8Mg(SiO4)4Cl2

“…The corresponding SAED pattern in the inset exhibits a singlecrystalline feature of the measured area, and some of the diffraction points are indexed to the (111), (115), and (004) planes of the CMSOC compound. Furthermore, by using the formerly reported structure of CMSOC as the initial model, 21 Rietveld refinement of high-quality XRD data of the CMSOC compound was conducted, and the results are shown in Figure 1c. The obtained reliability factors are R wp = 5.11%, R p = 2.72%, and R b = 4.81%, indicating an acceptable refining quality and ensuring phase purity.…”

“…Because of its excellent chemical and physical stabilities, the compound Ca 8 Mg(SiO 4 ) 4 Cl 2 (abbreviated as CMSOC hereafter) was selected to accommodate the doping Eu 3+ /Ce 3+ ions in this work. 21 To study the occupancy properties of the Eu 3+ and Ce 3+ ions in two inequivalent crystallographic Ca 2+ sites, the morphology, composition, crystal, and electronic structure of synthesized CMSOC are characterized, and the vacuum ultraviolet (VUV)−ultraviolet (UV) excitation and emission spectra and luminescence decay curves of rationally designed Eu 3+ and Ce 3+ singly-doped samples are studied in detail. We focus on the preferential site occupancies of the doping Eu 3+ and Ce 3+ ions in CMSOC using the luminescence spectra and dielectric chemical bond theory.…”