Fe–Mg substitution in aluminate spinels. Effects on elastic properties investigated by Brillouin scattering
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Bruschini Enrico, Speziale Sergio, Bosi Ferdinando, Andreozzi Giovanni B.
ISSN: 0342-1791
We investigated by a multi-analytical approach (Brillouin scattering, X-ray diffraction and electron microprobe) the dependence of the elastic properties on the chemical composition of six spinels in the series (Mg1−x,Fex)Al2O4(0 ≤ x ≤ 0.5). With the exception of C12, all the elastic moduli (C11, C44, KS0and G) are insensitive to chemical composition for low iron concentration, while they decrease linearly for higher Fe2+content. Only C12shows a continuous linear increase with increasing Fe2+across the whole compositional range under investigation. The high cation disorder showed by the sample with x = 0.202 has little or no influence on the elastic parameters. The range 0.202