Study on thermolysis process of a new hydrated and protonated perovskite-like oxides H2K0.5Bi2.5Ti4O13·yH2O

Physical–Chemical Exfoliation of n-Alkylamine Derivatives of Layered Perovskite-like Oxide H2K0.5Bi2.5Ti4O13 into Nanosheets

“…The starting inorganic matrix, KBT 4 , and its protonated form were prepared by previously reported methods [46,48]. KBT 4 was synthesized using a solid-state reaction from Bi 2 O 3 , TiO 2 , and KNO 3 .…”

“…Recently Liu et al [46] synthesized a new layered Ruddlesden−Popper phase K 2.5 Bi 2.5 Ti 4 O 13 (KBT 4 ) with mixed K/Bi co-occupancy on the perovskite A site, showing stoichiometric hydration and being amenable to form protonated compounds H 2 K 0.5 Bi 2.5 Ti 4 O 13 •yH 2 O [47,48] via substitution of K + by H + . The H 2 K 0.5 Bi 2.5 Ti 4 O 13 •H 2 O (HKBT 4 •H 2 O) structure can be described as an alternation of perovskite slabs (K 0.5 Bi 2.5 Ti 4 O 13 ) with interlayer protons and water molecules.…”

Synthesis of Organic–Inorganic Hybrids Based on Perovskite-like Bismuth Titanate H2K0.5Bi2.5Ti4O13·H2O and n-Alkylamines

“…The complete dehydration at 160 °C and formation of HKBT 4 leads to a further decrease in the interlayer distance with the displacement of perovskite blocks in the c direction as implied by calculated lattice parameters. 45 In order to examine the influence of interlayer water in the host compound on its activity in intercalation reactions, a partly dehydrated HKBT 4 •0.5H 2 O and fully dehydrated HKBT 4 samples have been used for intercalation reactions with methylamine and n-butylamine. The conditions tested are presented in Table 3.…”

“…7,33,34 Among ion-exchangeable layered perovskites, the most widely studied compounds amenable to intercalation of organic molecules are protonated derivatives of Dion− Jacobson (DJ), Ruddlesden−Popper (RP), and Aurivillius phases. 35 The most thoroughly studied among others in terms of intercalation and grafting of organic molecules are HLaNb 2 O 7 , 18,20,36−39 Recently, Liu et al 43 have synthesized a new n = 4 layered RP phase K 2.5 Bi 2.5 Ti 4 O 13 (KBT 4 ) with mixed K/Bi cooccupancy on the perovskite A site showing stoichiometric hydration and amenable to form the protonated compound H 2 K 0.5 Bi 2.5 Ti 4 O 13 •yH 2 O 44,45 by substitution of K + by H + . The H 2 K 0.5 Bi 2.5 Ti 4 O 13 •H 2 O (HKBT 4 •H 2 O) structure can be described as an alternation of perovskite slabs (K 0.5 Bi 2.5 Ti 4 O 13 ) with interlayer protons and water molecules (Figure 1a).…”

“…As is already known, some phases show poor or no reactivity in intercalation reactions compared to other ones, 39,48,49 which is assumed to be the result of their irreversible dehydration. Considering the possibility of a strong influence of the interlayer water on the occurrence of amine intercalation reactions, both the as-prepared hydrated phase (H 2 K 0.5 Bi 2.5 Ti 4 O 45 2.1.2. Intercalation of Amines.…”