High temperature behaviour and polymorphism of NaSrVO4 a larnite related structure

An in-situ study to investigate the behaviour of the NaSr-vanadate crystal structure as a function of temperature

Numerous compounds can be described with the general formula AIBIIXO4 (AI = alkali ion, BII = alkali-earth ion, X = P, V, As). Although the phosphate fami-ly is well investigated, less is known on arsenate and vanadate. In general all of them are known to have outstanding ferroelectric, ferroelastic or photolumines-cent properties.

The title compound belongs to the ASrVO4 (A = alkali ions) family, however very little is known so far for this specific one and several composition (A = Li, Rb, Cs) are even not reported till now. NaSrVO4 is used as phosphor with enhanced photoluminescence intensi-ties due to doping with Eu3+ or co-doping with Eu3+ and Bi3+(1). A second study (2) shows that in general the replacement of the PO3-4 ions with isomorphic VO3-4 ions improves the structural stability and the overall intensity of the emission. Furthermore, Sm3+-doped NaSrVO4 may be used as near ultraviolet (n-UV) convertible orange-red emitting phosphor in light emitting diodes (LEDs) (3).



1. Zeng, Y., Qui, K., Yang, Z., Bu, Y., Zhang, W., Li, J.: Enhanced red emission of NaSrVO4: Eu3+ phosphor via Bi3+co-doping for the application to white LEDs. 2017, Cera. Int., 43, 830-834
2. Lee, D.G., Singh, S.K., Moon, C.H., Yi, S.S., Jang, K., Shin, D.S., Jeong, J.H., Bae, J.S.: Photoluminescence Properties of NaSr(P, V)O4:Eu3+ Phosphors. 2013, J. Nanosci. Nanotechnol., 13, 5552-5
3. Biswasa, P., Kumara, V., Agarwalb, G., Ntwaeaborwac, O.M., Swart, H.C.: NaSrVO4:Sm3+ - An n-UV convertible phosphor to fill the quantum efficiency gap for LED applications. 2016, Cera. Int., 42, 2317-2323

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