Phase evolution of lead titanate from its amorphous precursor synthesized by the OPM wet-chemical route

Structure and photocatalytic properties of Nb-doped Bi12TiO20 prepared by the oxidant peroxide method (OPM)

“…The selective area electron diffraction (SEAD) pattern revealed that these spherical particles are amorphous (Fig. 5b), which agrees with the XRD pattern of the precipitate (not shown) and with the previous results about the synthesis of lead-based powders by the OPM (Camargo et al 2001(Camargo et al , 2004Nogueira et al 2014;Pinto et al 2011).…”

“…The outstanding features of the OPM powders are their reactivity, which could be confirmed in the SEM images of Fig. 4 by the presence of partially sintered particles and by the formation of necks between them (Camargo et al 2001(Camargo et al , 2004Nogueira et al 2014;Pinto et al 2011).…”

“…It is well known that the amorphous precipitate generated by the OPM route sometimes referred simply to as precursor is highly reactive and crystallizes at lower temperatures than those obtained by other routes (Camargo et al 2001(Camargo et al , 2004Nogueira et al 2014;Pinto et al 2011). Although pure sillenite Bi 12 TiO 20 phase was identified in the sample calcined at 700°C for 1 h, extra peaks were observed at 24°, 30°, 47°, and 57°in the XRD patterns of the Nbdoped samples (Fig.…”

“…The approaches for achieving this goal include the incorporation of transition metal ions into the semiconductor photocatalyst using various methods, such as ion implantation, sol-gel synthesis, solid-state reaction, and others (Zhang et al 2006;Yang et al 2002, Zhou et al 2007. In this context, the oxidant peroxide method (OPM) has been used to produce highly reactive ceramic powders with a variety of particle morphologies, sizes, and compositions (Camargo et al 2001(Camargo et al , 2004Nogueira et al 2014;Pinto et al 2011). A distinctive feature of OPM powders is the homogeneous distribution of elements throughout the entire particle Mendonça and Ribeiro 2011).…”

Nanosized lead lanthanum titanate (PLT) ceramic powders synthesized by the oxidant peroxo method

“…However, because of nanoparticles generally display properties that differ from those of bulk material, alternative synthetic routes to the solid-state reaction have been developed to obtain a wider number of compounds at this scale [2][3][4][5][6]. Particularly, PLT and PT have been synthesized by several wet-chemical routes [7][8][9], but recently one of us developed a new synthetic route called the "oxidant peroxo method", sometimes referred simply by the acronym OPM [10][11][12][13][14][15][16]. This wet-chemical method of synthesis is characterized by the fundamental oxyreduction reaction between lead(II) ions and some water soluble peroxo complexes that leads to the formation of an amorphous * Corresponding author.…”