Molecular NO_2 induced K_2Ti_2O_5-K_2Ti_6O_(13) structure switching in the dry gas phase: lattice potassium reactivity

摘要

A very interesting structure switching phenomenon between K_2Ti_2O_5 and K_2Ti_6O_(13) caused by gas phase molecular NO_2 adsorption and desorption at 500-600 ℃ is revealed, during which NO_2 is adsorbed on the lattice K~+ ion sites to form KNO_3 and the loss of K causes the remainder to regroup into nano-sized K_2Ti_6O_(13), with a lower K/Ti value.rnAlkali titanates represented by A_2O·nTiO_2 (A is the/alkali metal ion, n = 2, 4, 6, 8) in chemical formula, which consist of titanium oxide layers and inter-layer cations, have attracted great attention and been regarded as novel functional materials during the last decades.