This chapter provides a simple room temperature chemical precursor solution preparation techniques for the fabrication of pyrochlore-free crystalline films and some of the representative properties of SrBi2Ta2O9 thin film are exhibited as an example. The detailed fabrication procedure of SrBi2Ta2O9-Bi3TaTiO9 thin films will be presented in next chapter. However, for the fabrication procedure of...

Spin correlation in kagomé ice state: neutron scattering study of the dipolar spin ice Dy 2 Ti 2 O 7 under magnetic field along [111] Abstract We have investigated the kagomé ice state in the frustrated pyrochlore oxide Dy 2 Ti 2 O 7 under magnetic field along a [111] axis. Spin correlations have been measured by neutron scattering and analyzed by Monte-Carlo simulation. The kagomé ice state, w...

Ferroelectric SrBi2(Ta12xNbx)2O9 ~SBNT! thin films were deposited on Pt/TiOx /SiO2 /Si substrates at various substrate temperatures by the pulsed laser ablation deposition method. X-ray diffraction shows that the film has a fluorite structure at a substrate temperature of 500 °C. The fluorite structure was transformed into perovskite phase at 550 °C and was fully crystallized at temperatures >7...

The morphology of defect pyrochlore-type, AgSbO3 microparticle/nanoparticles obtained via solid state reaction evolve from irregular to Fullerene-like polyhedra before finally decomposing into metal-organic framework-5 like particles with increase in sintering temperature. The defect pyrochlore-type AgSbO3 particles are slightly Ag deficient while the valence of the antimony ion is shown to be ...

An NMR crystallographic approach, involving the combination of 119Sn NMR spectroscopy, XRD, and DFT calculations, is demonstrated for the characterization of La2Sn2-x Ti x O7 ceramics. A phase change from pyrochlore (La2Sn2O7) to a layered perovskite phase (La2Ti2O7) is predicted (by radius ratio rules) to occur when x ≈ 0.95. However, the sensitivity of NMR spectroscopy to the local environmen...

The spin ice materials, including Ho2Ti2O7 and Dy2Ti2O7, are rare-earth pyrochlore magnets which, at low temperatures, enter a constrained paramagnetic state with an emergent gauge freedom. Spin ices provide one of very few experimentally realized examples of fractionalization because their elementary excitations can be regarded as magnetic monopoles and, over some temperature range, spin ice m...

The formation mechanisms of pyrochlore-type Bi2Co1/2Cr1/2Nb2O9+Δ (space group Fd-3m, a = 10.4838(8) Å), in the temperature range from 400 to 1050 °C were studied by employing X-ray diffraction, scanning electron microscopy and energy-dispersive spectroscopy. An extensive reaction between binary metal oxides was found begin at temperatures above 550 °C, following transition monoclinic α-Bi2O3 in...

Pyrochlore oxides (A2B2O7) simultaneously containing iridium and ruthenium in the B-site are promising catalysts for oxygen evolution reaction (OER) acid media. The catalytic activity of pyrochlore based is increased by coexistence Ir Ru structure. Lanthanide (Yb, Gd, or Nd) stabilized mixed pyrochlores with a fraction xRu =0.2, 0.4, 0.6, 0.8 were synthesized spray-freeze freeze-dry approach. A...

We present here correlation driven orbital Mott transition in 2 dimensional pyrochlore lattice. We study a model Hamiltonian in which we take Hund’s coupling between itinerant and localized electrons apart from the coulomb interaction. In the weak coupling limit, we calculate zero temperature susceptibility under random phase approximation and find the model in para orbital phase. In strong cou...