The magnetic susceptibility of Pr4+ in BaPrO3: Evidence of long-range magnetic order

Theoretical studies of the Spin Hamiltonian Parameters for the orthorhombic Pr4+ ion in SrCeO3 crystal

“…The basis function of the lowest doublet Γ γ can be obtained by diagonalizing the 14 × 14 energy matrix in orthorhombic symmetry based on the J-mixing between the 2 F 5/2 ground and 2 F 7/2 excited states via crystal-field interaction and the spin-orbit coupling interaction. In order to establish the perturbation formulae of 4f 1 …”

“…The mechanism for the strong superexchange interaction that gives rise to long-range magnetic ordering at relatively high temperatures in oxides containing tetravalent f-ions has yet to be fully understood [1,2]. Among the lanthanides, the trivalent oxidation state is the most stable, and it is of interest that only cerium, praseodymium, and terbium, that can be obtained in tetravalent state.…”

Hydrogen content in doped and undoped BaPrO3 and BaCeO3 by cold neutron prompt-gamma activation analysis

“…15͒ at the NIST Center for Neutron Research ͑at room temperature͒. The neutron beam was collimated to a 2-cm diameter with a 6 Li glass aperture. The sample envelopes were mounted vertically on the instrument such that the beam irradiated an area near the center of the sample.…”

“…2,3 In addition, BaPrO 3 is unusual in its ability to host Pr primarily ͑if not entirely͒ in the 4 + oxidation state, and has therefore been of interest for its magnetic properties. [4][5][6][7][8][9] Measurement of hydrogen ͑or water͒ uptake in proton conducting perovskites has typically been carried out by thermogravimetric methods, 1 although in a limited number of cases other techniques have been employed. In an early example, the water solubility in yttria-stabilized zirconia ͑YSZ͒ has been determined from a measurement of the equilibrium water vapor pressure above the material, 10 whereas measurement of the integrated OH stretching band as determined from IR spectroscopy has been somewhat more recently employed in the case of strontium titanate.…”

Standard molar enthalpies of formation of PrO2and SrPrO3: the unusual thermodynamic stability of APrO3(A = Sr, Ba)

“…( [1][2][3][4] More recently, the thermodynamic properties of SrLnO 3 (Ln=Ce, Tb) have been determined, (5) but SrPrO 3 was not included in the study because of synthesis difficulties. (6) For nearly all A 2+ M 4+ (O 2− ) 3 perovskites, where M is one of many transition metals, lanthanides, and actinides, a linear relation exists between the enthalpy of the reaction of the binary oxides AO and MO 2 to form the ternary oxide AMO 3 :…”