Liu et al., "Preparation and photocatalytic properties of sillenite
[Bi.sub.12]Ti[O.sub.2]0 films," Surface and Coatings Technology, vol.
Nunes, "Vanadium characterization in BTO:V sillenite crystals," Materials Research, vol.
Suvorov, "Processing and dielectric properties of sillenite compounds [Bi.sub.12] [MO.sub.20-[delta]] (M = Si, Ge, Ti, Pb, Mn, [B.sub.1/2] [P.sub.1/2)]," Journal of the American Ceramic Society, vol.
Bismuth germanate ([Bi.sub.12]Ge[O.sub.20)] belongs to a class of materials known as sillenites with general formula [Bi.sub.12]M[O.sub.20], where M represents a tetravalent ion or a combination of ions yielding average charge 4+ [1, 2].
Some synthesis routes have been proposed to obtain [Bi.sub.12]Ge[O.sub.20] single crystals and ceramics [10-14], but to our knowledge Pechini route has not been reported up to now for the production of [Bi.sub.12]Ge[O.sub.20] or any other sillenites. Pechini process has emerged as a powerful method to obtain nanocrystalline powders in several compositions.
Konstantinov, "Raman spectroscopy study of sillenites. I.
Zayarnyuk, "Highly photoconducting sillenite single crystals," Crystal Engineering, vol.
Carvalho, "Characterization of photorefractive undoped and doped sillenite crystals using holographic and photoconductivity techniques," Journal of Optics A, vol.
Hernandes, "Vanadium characterization in BTO:V sillenite crystals," Materials Research, vol.
It belongs to a class of materials known as sillenites , which includes the isomorphs [Bi.sub.12]Si[O.sub.20], BSO, and [Bi.sub.12]Ge[O.sub.20], BGO.
Boubaker, "The Lattice Compatibility Theory (LCT): an attempt to explain Urbach tailing patterns in copper-doped bismuth sillenites
(BSO) and germanates (BGO)," Journal of Alloys and Compounds, vol.