Study of optical properties of Cr3+ ions in Cs2NaAlF6 single crystals

Cs2NaAl1−xCrxF6: A family of compounds presenting magnetocaloric effect

“…Other successful examples consist of perovskite-type oxides [11], metal-organic frameworks containing gadolinium [12], and molecular nanomagnets, such as Mn 32 [13] and Fe 14 [14]. However, very few studies have so far reported on caloric effects in fluoride systems [15][16][17], which is the aim of this paper.From the point of view of optical and structural properties, Cs 2 NaAl 1−x Cr x F 6 elpasolite single crystals, which crystallize in the R3m space group, have been thoroughly investigated [18][19][20][21][22][23][24][25][26][27]. The choice of the Cr 3+ ion as a doping impurity is justified by the fact that its 3d unfilled shell produces electronic transitions that increase the luminescent properties and the quantum yield of the material [20,[27][28][29].…”

“…Magnetic susceptibility and specific heat measurements as a function of temperature and applied magnetic field bring about an interesting Schottky-like anomaly at low temperatures under an applied magnetic field. From these data, we show that the T ad and S T of these materials are comparable to those of some well known garnets and perovskite compounds, opening new doors for their application in cryorefrigeration.Cs 2 NaAl 1−x Cr x F 6 single crystal samples of about 3 × 2 × 1 mm 3 containing x = 0.01 and 0.62 of Cr 3+ doping were grown by hydrothermal techniques, using the temperature gradient method [20]. Single crystal x-ray diffraction data of the samples were collected on a Bruker Apex II CCDbased diffractometer using graphite monochromatized Mo-Kα radiation.…”

“…The choice of the Cr 3+ ion as a doping impurity is justified by the fact that its 3d unfilled shell produces electronic transitions that increase the luminescent properties and the quantum yield of the material [20,[27][28][29].…”

“…Cs 2 NaAl 1−x Cr x F 6 single crystal samples of about 3 × 2 × 1 mm 3 containing x = 0.01 and 0.62 of Cr 3+ doping were grown by hydrothermal techniques, using the temperature gradient method [20]. Single crystal x-ray diffraction data of the samples were collected on a Bruker Apex II CCDbased diffractometer using graphite monochromatized Mo-Kα radiation.…”

“…From the point of view of optical and structural properties, Cs 2 NaAl 1−x Cr x F 6 elpasolite single crystals, which crystallize in the R3m space group, have been thoroughly investigated [18][19][20][21][22][23][24][25][26][27]. The choice of the Cr 3+ ion as a doping impurity is justified by the fact that its 3d unfilled shell produces electronic transitions that increase the luminescent properties and the quantum yield of the material [20,[27][28][29].…”