A2B2O7 (A= La, Pr, Nd, Sm, Gd and B Ti, Zr, Sn) ceramics for mild-temperature NO2 sensing and reduction

Electrocatalytic Studies of Coral-Shaped Samarium Stannate Nanoparticles for Selective Detection of Azathioprine in Biological Samples

“…All of the X-ray peaks were mainly indexed to the cubic pyrochlore-type Fd 3 m space group structure with a lattice constant of a = 0.09 nm (Rietveld refinement). These obtained X-ray peak positions were in good agreement and very close to those for the previously reported pyrochlore stannates followed by matches with the standard JCPDS card value (01-073-1685) . Moreover, this symmetry confirmed that Sm 2 Sn 2 O 7 is a long-range pyrochlore material rather than an oxygen-deficient fluorite, indicating the ordering of Sm and Sn ions on the corresponding A and B sites.…”

“…Followed by this, Rajakumaran et al clearly discussed the electrochemical behavior of pyrochlore-type praseodymium stannate for the electrochemical sensing of a nitrofurazone drug in biological fluids . Other than that, Duan et al proved that the Sm 2 Sn 2 O 7 ceramic is a suitable material for the NO 2 sensing process . On the basis of these studies, we believe that the unique behavior of Sm 3+ (4f 6 6s 2 ) endows different band structures and mixed-valence states in nature, which will induce high electronic transport for improved electrochemical sensing phenomena.…”

“…Hence, the history and defect chemistry of lanthanide stannate were already discussed in our previous article . Samarium stannate (Sm 2 Sn 2 O 7 ), a new type of inorganic material that was used in the form of a sensing material in recent studies because of its abundant surface oxygen species, is an essential compound . In addition to that, the Sm is an element with an ionic radius (1.08 Å) that exists in between those of europium (Eu) and yttrium (Y), which is also an important point for the enhanced electrochemical behavior of samarium-based compounds .…”

“…In addition to that, the Sm is an element with an ionic radius (1.08 Å) that exists in between those of europium (Eu) and yttrium (Y), which is also an important point for the enhanced electrochemical behavior of samarium-based compounds . More deeply, the presence of Sm in stannate form will induce n-type conduction (7.29 × 10 –10 Ω cm –1 ), which increases the electronic conductivity associated with mixed different oxidation states (+2 and +3 states), which leads to their enhanced electrochemical properties. , For example, our group’s previous article by Sukanya et al proved that the combination of rare earth stannate oxide (CeO 2 –SnO 2 ) should be a suitable electroactive material for electrochemical detection of the pharmaceutical drug mesalamine . Followed by this, Rajakumaran et al clearly discussed the electrochemical behavior of pyrochlore-type praseodymium stannate for the electrochemical sensing of a nitrofurazone drug in biological fluids .…”

The effect of silicon on cerium zirconates pyrochlores nanoparticles

“…The actual formula of pyrochlore is A 2 B 2 O 6 O' because of the two crystallographic non-equivalent sites for the oxide ions. Usually, cation "A" has ionic radius in the range of 0.9-1.2 Å with the coordination number of 8, whereas the smaller cation "B" has the ionic radius in the range of 0.5-0.75 Å and a coordination number 6 [5,6].…”