Raman Spectra of TiO2, MgF2, Zn

S. P. S. Porto¹,

P. A. Fleury²,

T. C. Damen³

Temperature-dependent Raman and x-ray studies of the spin-ice pyrochloreDy2Ti2O7and nonmagnetic pyrochlore

“…We and Lummen et al [16] have observed a mode near 450 cm −1 in several of the pyrochlore titanates. This mode has sometimes been assigned to T iO 2 as an impurity phase in the pyrochlore sample [26]. We rule out this possibility because a strong mode of T iO 2 , near 610 cm −1 , is not seen in our single-crystals.…”

A F-bridged Mn(ii) molecular square

“…The room 115 temperature χ m T value of ~12.8 cm 3 mol -1 K is significantly lower than that expected for four non-interacting Mn II centres (~17.5 cm 3 mol -1 K for g = 2.0) and is indicative of antiferromagnetic exchange between the four metal centres. The value of χ m T drops gradually with decreasing temperature before 120 falling more rapidly below ~125 K reaching a value of 0.47 cm 3 mol -1 K at 5 K. Simulation of the magnetic data 10 using the 1-J model of Equation (1) and the scheme of Figure 3 12 The Raman spectrum of MnF 2 exhibits symmetric stretch peaks at 242 and 245 cm -1 (Eg mode) 13 and a peak at 336 140 cm -1 consistent with terminal Mn-F stretching (A 1g mode) 13 which is corroborated by its absence in the spectrum of 1 (Fig. 3).…”

Magnetic recyclable microcomposite silica-steel core with TiO2 nanocomposite shell photocatalysts for sustainable water purification

“…73,74,75,76 In the case of P25 (5) nanocomposite coated silica-steel microcomposite particles, characteristic anatase TiO 2 Raman signals were observed, whilst the lack of any significant haematite Fe 2 O 3 peaks, 67 corroborated a thicker coating compared to TiO 2 (1), Figure 3 and Table S1. The absence of any TiO 2 rutile Raman signal for P25 (5), is consistent with the aforementioned reference spectrum of P25 TiO 2 nanoparticles.…”