Showing papers in "Journal of Solid State Chemistry in 1988"

TL;DR: In this article, the tracer diffusion coefficient of oxide ions, D∗ O, in La 1− x Sr x CoO 3− δ ( x = 0.1) and La 1 − x Srs x M O 3−δ ( M = Co, Fe) was determined.

TL;DR: The structure of Li2MnO3 was refined on a single crystal: space group C2 m, a = 493.7 (1), b = 853.2(1), c = 503.0(2) pm, β = 109.46(3)°, Z =4, R = 0.020, Rw = 0.027 for 619 independent reflections with I > 5σ.

TL;DR: A novel ordered oxygen-deficient perovskite with a layer structure, YBaCuFeO/sub 5+delta/, was isolated by chemical analysis, Moessbauer spectroscopy, and magnetic susceptibility measurements versus temperature as discussed by the authors.

TL;DR: Substitution of Ca for Y does not increase the maximum oxidation state of the (CuO3−δ)(3−x)− layers of Y 1−xCaxBa2Cu3O7−ε (0 ≤ x) as discussed by the authors.

TL;DR: The most probable vacancy-ordering schemes for Sr8Fe8O23 and Sr4Fe4O11 (n = 4) are proposed in this article, where fivefold-coordinated iron sites on either side of an oxygen vacancy is characteristic of both phases.

TL;DR: The room temperature structure of SrFe/sub 12/O/sub 19/ hexagonal ferrite has been refined from X-ray single-crystal data in this article, where structural isomorphism of the title compound with the hexagonal Ferrite BaFe/s 12 O/s 19/ has been demonstrated, corroborating that the bipyramidal Fe ions have a fast diffusional motion within a quasiharmonic double-well potential as in BaFe

TL;DR: In this article, the phase 4H-SrMnO3 is paramagnetic at 290 K, contrary to earlier reports that the susceptibility maximum at ∼350 K is thought to represent only short-range coupling between Mn4+ ions in the Mn2O9 pairs of face-sharing octahedra in the structure.

TL;DR: In this article, the utility of infrared and Raman spectroscopy in the characterization of powdered samples is illustrated for the case of TiO2 (rutile) by showing that particle shape and state of aggregation of the microcrystals are shown to have a strong effect on the infrared powder spectra as predicted by the Theory of the Average Dielectric Constant.

TL;DR: In this article, the authors observed the partial occupation of a mid-Na interstitial site within the conduction path in the NASICON solid solution by X-ray diffraction and showed that the enhanced conductivity at x = 2 arises from sodium interactions instead of geometry changes of the framework.

TL;DR: The crystal structure of three different samples of melt-grown β-rhombohedral boron has been reinvestigated in this paper, which gives an X-ray-predicted crystal density of 2.333(5) g/cm 3 compared to a pycnometric value of 2.333(2) g /cm 3.

TL;DR: In this article, infrared and Raman spectroscopies have been applied to study rf sputtered tungsten oxide films as prepared and after the chemical modifications induced by successive coloration/bleaching cycles.

TL;DR: The bulk defect chemistry of polycrystalline SnO2 has been investigated systematically by impedance spectroscopy as discussed by the authors, and the intrinsic behavior was observed with a characteristic exponent of − 1 6 for T > 800°C in nominally pure oxides.

TL;DR: In this paper, the crystal structure of CaO·6Al2O3 at 294 K was investigated by X-ray diffraction and refined to an R value of 0.025 for 2735 reflections (1492 independent reflections).

TL;DR: In this article, a new superconductor was isolated and characterized by X-ray diffraction and electron microscopy, which is a member of the family (AO)n(A′CuO3−y)n′ (A = Tl, Ba and A′ = Ba, Ca) with n = 2 and n′ = 2.

TL;DR: In this paper, a new oxygen-deficient perovskite corresponding to the formulation La8−xSrxCu8O20−e (1.28 ≤ x ≤ 1.92) has been isolated.

TL;DR: In this paper, the metastable phase β-AlF3 was solved by X-ray powder and single-crystal diffraction methods, and the crystal habit is pseudo-hexagonal with systematic twinning (rotation of 120° around the c axis), but the true symmetry is orthorhombic with space group Cmcm, Z = 12, a = 6.931(3), b = 12.492(4), c = 7.534(5), A = 0.

TL;DR: In this article, the electrical and magnetic properties of several oxide systems of K2NiF4 structure have been compared to those of the corresponding perovskites, and generalizations of the properties of two-and three-dimensional oxide systems have emerged from these experimental observations.

TL;DR: Li2RuO3 has a monoclinic unit cell (C2/c; a = 4.9116A˚,b = 8.7586A˔,c = 9.8544A˒, β = 100.08°) as mentioned in this paper, and its structure closely resembles that of β-Li2SnO3, but there is a different stacking of alternating, close-packed Li andLiM2 layers.

TL;DR: In this paper, optical absorption and emission spectra for Dy3+ ions in fluorozirconate (ZBLA) glass are presented, and measured oscillator strengths and radiative rates for several transitions are compared with calculated values.

TL;DR: In this article, the authors determined the heat of formation from oxides for perovskite compounds by high-temperature solution calorimetry using an alkali borate solvent.

TL;DR: A sodium titanate was synthesized at low temperatures (90-280°C) by a reaction of either anatase or titanium isopropoxide with NaOH as discussed by the authors.

TL;DR: The structure of the 110 K superconductor TlBa2Ca2Cu3O9 has been grown and the structure refined from single-crystal X-ray diffraction data.

TL;DR: In this paper, the reaction of ZnO with In2O3 at 1100°C produced a series of compounds with layer structures which have been characterized using powder X-ray diffraction and high-resolution electron microscopy.

TL;DR: Li2MoO3 has a disordered α-NaFeO2 structure (R 3 m; a = 2.884 A, c = 14.834 A) with the molybdenum present as Mo3O13 clusters.

TL;DR: In this paper, local and extended constructions of the bonding in transition metal AB 2 X 2 compounds of ThCr 2 Si 2 and CaAl 2 Si2 types are contrasted.

TL;DR: In this article, the phase equilibria in LnM-O systems (Ln = La, Pr, Nd; M = Co, Ni, Cu) were investigated in the temperature range 937-1573 K and for oxygen partial pressures of 10−15-1 atm.

TL;DR: In this article, the absolute configuration of Na2Ca3Al2F14 is determined from 1412 X-ray independent reflections (R = 0.024) and Rw =0.019).

TL;DR: In this article, the pyrochlores of the type R2Mn2O7 have been characterized where R is Dy, Ho, Er, Tm, Yb, Lu, or Y. All are semiconductors with activation energies ranging from 0.37 to 0.51 eV, which correlate well with the electronegativity of R.

TL;DR: In this paper, the luminescence properties of AEuW2O8 and AEuMo 2O8 (A+ = alkali metal ion) are reported, which depend on the crystal structure type.