Showing papers by "Enrique J. Baran published in 1981"
TL;DR: In this paper, the laser-Raman spectra of the tetragonal rare earth orthovanadates of the type LnVO4 (Ln = Pr to Lu) as well as those of ScVO4 and YVO4 has been recorded and interpreted with the aid of both, the site symmetry and the factor group analysis, using also IR data reported previously.
Abstract: Die Laser-Raman-Spektren der tetragonalen Orthovanadate der Seltenen Erden des Typs LnVO4 (Ln = Pr bis Lu) sowie diejenigen von ScVO4 und YVO4 wurden aufgenommen und an Hand einer „Site-Symmetrie”-bzw. Faktorgruppenanalyse gedeutet. Auch Daten fruher durchgefuhrter IR-Messungen wurden herangezogen. Der Einflus der Kationen auf die inneren Anionenschwingungen wurde eingehend diskutiert.
Raman Spectra of the Rare Earth Orthovanadate
The laser-Raman spectra of the tetragonal rare earth orthovanadates of the type LnVO4 (Ln = Pr to Lu) as well as those of ScVO4 and YVO4 has been recorded and interpreted with the aid of both, the site symmetry and the factor group analysis, using also IR data reported previously. The influence of the cations on the internal vibrations of the anion are discussed in detail.
53 citations
TL;DR: In this paper, pure samples of the monoclinic (monazite-like) form of PrCrO 4 have been obtained for the first time and some of its properties are reported.
26 citations
TL;DR: In this article, a series of rare earth decavanadates of the type Ln2V10O28·nH2O have been obtained from monocrystals by precession and Weissenberg measurements.
16 citations
TL;DR: In this article, the authors compare the IR and Raman spectra of α-Te2MoO7 with those of telluromolybdates of the type MIITeMoO6 and propose a structural model for these phases.
Abstract: Die IR- und Raman-Spektren von α-Te2MoO7 wurden aufgenommen und an Hand der bekannten kristallographischen Daten zugeordnet. Durch Vergleich dieser Spektren mit demjenigen einiger Telluromolybdate des Typs MIITeMoO6 kann fur diese Phasen ein Strukturvorschlag gegeben werden, der sich durch die spektroskopischen Daten einwandfrei rechtfertigen last.
Vibrational Spectrum of α-Te2MoO7 and a Proposal for the Structure of Telluromolybdates of Divalent Cations
Infrared and Raman spectra of α-Te2MoO7 have been recorded and discussed in relation to their known crystalline structure. The comparison of these spectra with those of telluromolybdates of the type MIITeMoO6, allows us to propose a structural model for these phases, which is totally consistent with the spectroscopic findings.
14 citations
TL;DR: In this paper, the infrared and Raman spectra of Ba3V10O28·19 H2O has been recorded and an assignement for the internal vibrations of the V10O 28 − 6− 19 H 2O anion is given.
Abstract: The infrared andRaman spectra of Ba3V10O28·19 H2O has been recorded and an assignement for the internal vibrations of the V10O
28
6−
anion is given. Infrared data of the hydrated decavanadates of silver, cadmium, magnesium and lanthanum are also reported and briefly discussed.
9 citations
TL;DR: In this article, the principal force constants for the title anions have been calculated using the GVFF and mean amplitudes of vibration at different temperatures are also estimated, and compared with related species.
Abstract: Abstract The principal force constants for the title anions have been calculated using the GVFF. Mean amplitudes of vibration, at different temperatures are also estimated. The results are briefly discussed and some comparisons with related species are made
8 citations
TL;DR: Mean amplitudes of vibration of SeF4 and TeF4 have been calculated from known spectroscopic data in a wide temperature range as discussed by the authors, and some comparisons with related species are made.
Abstract: Mean amplitudes of vibration of SeF4 and TeF4 have been calculated from known spectroscopic data in a wide temperature range. The results are briefly discussed and some comparisons with related species are made.
6 citations
TL;DR: In this article, the distortion produced by the substitution of Ca(II) for Sr (II) upon the PO43-ions in the Ca10(PO4)6(OH)2 and Ca10 (PO 4)6F2 lattices have been investigated.
Abstract: Abstract The distortive effects produced by the sub-stitution of Ca(II) for Sr(II) upon the PO43-ions in the Ca10(PO4)6(OH)2 and Ca10(PO4)6F2 lattices have been investigated. The study is based on the behaviour of the symmetric stretching frequency of the anion in series of solid solutions containing both cations.
4 citations
4 citations
TL;DR: In this paper, the mean amplitudes of vibration for the cations ClF + 4, BrF+ 4 and IF + 4 have been calculated using the Method of the Characteristic Vibrations and recently revised spectroscopic data.
3 citations
TL;DR: Mean amplitudes of vibration for SF4O have been calculated from known spectroscopic data in a wide temperature range as mentioned in this paper, and the results are briefly discussed and some comparisons with related species are made.
Abstract: Mean amplitudes of vibration for SF4O have been calculated from known spectroscopic data in a wide temperature range The results are briefly discussed and some comparisons with related species are made
TL;DR: In this article, the apatite phases of composition Ca10-xNax(PO4)6-x(SO4)xF2 crystallize in a monoclinic unit cell, which is related to those of pure fluoroapatite.
Abstract: It is shown that the apatite phases of composition Ca10-xNax(PO4)6-x(SO4)xF2 crystallize in a monoclinic unit cell, which is related to those of pure fluoroapatite by doubling the b-parameter. Some comparisons with related systems are made and a possible explanation for the origin of the small monoclinic distortion is advanced