Synthesis, Crystal Structure, Spectroscopic and Thermal Analysis of Strontium Pyrophosphate Dihydrate Nanoparticles

Abstract

Various pyrophosphates are very useful as bioceramics; for instance, strontium pyrophosphate is one of the emerging forms of alkaline phosphate. Strontium pyrophosphate dihydrate (Sr 2 P 2 O 7 2H 2 O) nanoparticles were synthesized by the surfactant-mediated approach and characterized by different techniques. From the powder XRD study, the average crystallite size was evaluated by applying Scherrer's formula, which was found to be 33.57 nm. The average crystallite size and internal strain were also evaluated using Williamson-Hall (W-H) method. The FT-IR spectroscopy study confirmed the presence of symmetric and asymmetric stretching vibrations of P-O-P and PO 3 . The UV-NIR absorption spectroscopy over the spectral range of 210-1200 nm was employed, and the energy band gap was calculated from Tauc's plot which was found to be 4.9 eV. Thermogravimetric analysis (TGA) confirmed the presence of two water molecules in the sample. From TGA, it was found that the sample become anhydrous and on heating above 410-800°C, the sample remained almost stable with slight weight gain due to adsorption of purged gas. Various kinetic parameters and thermodynamic parameters were evaluated for dehydration process. *pds_2307@yahoo.co.in

Structural, morphological and electrical properties of multi-doped calcium phosphate materials as solid electrolytes for intermediate temperature solid oxide fuel cells

“…Figure 5c shows vibration spectrum of CaSrNaP 1000 material. Presence of previously described P-O and P-O-P vibrations which belong to β-Ca 2 P 2 O 7 phase also belong to Sr 2 P 2 O 7 [43,44]. The band around 740 cm -1 belongs to P-O-P bridge stretching vibration, a striking feature of (P 2 O 7 ) 4ions in Sr 2 P 2 O 7 .…”

“…FTIR spectrum of CaSrNaP (Fig. 5c) shows no evidence of O-H stretching modes at around 3500 and 1600 cm -1 [44]. Metal-oxygen vibrations in these types of systems are generally too low to be seen in the 400-4000 cm -1 region.…”

“…The analysis of CaSrNaP 1000 spectrum (Fig. 5c) confirms absence of O-H vibrations and presence of (P 2 O 7 ) 4vibrations which is unique for X 2 P 2 O 7 types of compounds [43,44].…”

Synthesis and Characterization of Iron Tartrate Nanoparticles

“…Table-2 gives the values of average crystallite size and strain. The average crystallite size calculated from Williamson & Hall relation is less than that calculated from Scherrer′s formula due to the strain correction factor considered in the Williamson & Hall equation [11,12]. TEM: TEM images provide direct information of the size, shape, dispersion, structure and morphology of nano-systems.…”

“…The average crystallite size was calculated by employing Scherrer′s formula and Williamson & Hall equation to powder XRD results. The standard formulations were applied as given by Solanki et al [11]. Table-2 gives the values of average crystallite size and strain.…”