Preparation, structure, optical, and magnetic properties of lanthanide aluminate single crystals (LnMAl11O19)

摘要

Rarehyphen;earth aluminates having the general formula LnMAl11O19with Ln3+= La, Pr, Nd, Sm, Eu, Gd, and M2+= Mg, Ni, Co, Mn, Fe have been synthetized. This paper is devoted to mixed compounds of the series La1minus;xNdxMg Al11O19of which large single crystals have been obtained by the flame fusion method. A full refinement of the pure lanthanum compound (x= 0) having a quasimagnetoplumbite structure has been performed (finalR= 0.039). Spectroscopic investigations of the (La, Nd) aluminate have allowed the measurement of fluorescence yield and lifetime of Nd3+in the host lattice as a function of the neodymium content. Additional results have been obtained on the magnetic anisotropy, from susceptibility measurements performed on the Nd3+aluminate in the temperature range 4ndash;300 K.