60 research outputs found
Correlations of structural, magnetic, and dielectric properties of undoped and doped CaCu3Ti4O12
The present work reports synthesis, as well as a detailed and careful
characterization of structural, magnetic, and dielectric properties of
differently tempered undoped and doped CaCu3Ti4O12 (CCTO) ceramics. For this
purpose, neutron and x-ray powder diffraction, SQUID measurements, and
dielectric spectroscopy have been performed. Mn-, Fe-, and Ni-doped CCTO
ceramics were investigated in great detail to document the influence of
low-level doping with 3d metals on the antiferromagnetic structure and
dielectric properties. In the light of possible magnetoelectric coupling in
these doped ceramics, the dielectric measurements were also carried out in
external magnetic fields up to 7 T, showing a minor but significant dependence
of the dielectric constant on the applied magnetic field. Undoped CCTO is
well-known for its colossal dielectric constant in a broad frequency and
temperature range. With the present extended characterization of doped as well
as undoped CCTO, we want to address the question why doping with only 1% Mn or
0.5% Fe decreases the room-temperature dielectric constant of CCTO by a factor
of ~100 with a concomitant reduction of the conductivity, whereas 0.5% Ni
doping changes the dielectric properties only slightly. In addition,
diffraction experiments and magnetic investigations were undertaken to check
for possible correlations of the magnitude of the colossal dielectric constants
with structural details or with magnetic properties like the magnetic ordering,
the Curie-Weiss temperatures, or the paramagnetic moment. It is revealed, that
while the magnetic ordering temperature and the effective moment of all
investigated CCTO ceramics are rather similar, there is a dramatic influence of
doping and tempering time on the Curie-Weiss constant.Comment: 10 pages, 11 figure
Local structure study about Co in YBa(CuCo)O thin films using polarized XAFS
We have studied the local structure around Co in
YBa(CuCo)O thin films with three different
concentrations: x=0.07, 0.10, 0.17, and in a
PrBa(CuCo)O thin film of concentration x=0.05
using the X-ray Absorption Fine Structure (XAFS) technique. Data were collected
at the Co -edge with polarizations both parallel and perpendicular to the
film surface. We find that the oxygen neighbors are well ordered and shortened
in comparison with YBCO Cu-O values to 1.80 \AA{} and 1.87 \AA{} in the
-axis and -plane, respectively. A comparison of further neighbors in the
thin film and powder data show that these peaks in the film are suppressed in
amplitude relative to the powder samples, which suggests there is more disorder
and/or distortions of the Co environment present in the thin films.Comment: 14 pages; To be submitted to Phys. Rev.
NEW SUPERCONDUCTING OXIDES IN THE Bi-Sr-Ca-Cu-O SYSTEM : MAGNETIC MEASUREMENTS AND STRUCTURAL DETERMINATION
The Crystal Structure and RNA-Binding of an Orthomyxovirus Nucleoprotein
Genome packaging for viruses with segmented genomes is often a complex problem. This is particularly true for influenza
viruses and other orthomyxoviruses, whose genome consists of multiple negative-sense RNAs encapsidated as
ribonucleoprotein (RNP) complexes. To better understand the structural features of orthomyxovirus RNPs that allow them
to be packaged, we determined the crystal structure of the nucleoprotein (NP) of a fish orthomyxovirus, the infectious
salmon anemia virus (ISAV) (genus Isavirus). As the major protein component of the RNPs, ISAV-NP possesses a bi-lobular
structure similar to the influenza virus NP. Because both RNA-free and RNA-bound ISAV NP forms stable dimers in solution,
we were able to measure the NP RNA binding affinity as well as the stoichiometry using recombinant proteins and synthetic
oligos. Our RNA binding analysis revealed that each ISAV-NP binds ,12 nts of RNA, shorter than the 24ï¾–28 nts originally
estimated for the influenza A virus NP based on population average. The 12-nt stoichiometry was further confirmed by
results from electron microscopy and dynamic light scattering. Considering that RNPs of ISAV and the influenza viruses have
similar morphologies and dimensions, our findings suggest that NP-free RNA may exist on orthomyxovirus RNPs, and
selective RNP packaging may be accomplished through direct RNA-RNA interactions
Insight into the Ebola virus nucleocapsid assembly mechanism: crystal structure of Ebola virus nucleoprotein core domain at 1.8 Ã… resolution
The Crystal Structure of Ba (Bi0.977K0.023)O3 by Single-Crystal X-Ray Diffraction
We determined by X-ray diffraction the structure of a slightly K-doped BaBiO3 single-crystal. The best refinements were obtained by describing the structure in the monoclinic I2/m space group similarly to the structure of the undoped compound. In this description the Bi cations occupy two crystallographically independent sites. We found that at this low K concentration, the K atoms are not, as expected, substituting for the Ba cations but are located on one of the two Bi sites. The two octahedral Bi sites are alternatively compressed and elongated along the c-axis. The formal valences of the two Bi cations deduced from the Brown and Altermatt formula are 3.79 and 4.44, respectively. This indicates that these cations are disproportionated into Bi3+ and Bi5+; however, they are only partially ordered
Recommended from our members
Two-phase structural refinement of La2CuO4.032 at 15 K
A two-phase refinement of a crystal for the compound La2CuO4+δ (δ=0.032), based on the neutron diffraction data collected at 15 K with the D9 diffractometer at ILL, using {double barred pipe}=0.48 A ̊, has been carried out. One phase (30%) consists of stoichiometric La2CuO4 domains, while the other (70%) of oxygen-rich La2CuO4.048 domains. The percentages of each phase, which have been refined together with the other parameters (scale factor, positional parameters, thermal factors and occupancy factors of the oxygen atoms), agree very well with the value determined from χAC measurements. The La2CuO4.048 structure is essentially the same as the average structure reported in ref. [1], the only difference being the oxygen content which is found to be δ= δ 0.70. The extra oxygen, O(4), is found to be in between two LaO layers in a similar position as the oxygen atoms located between two Nd layers in the N2CuO4 structure. The insertion of extra oxygen causes the displacement of some of the oxygen O(1) towards the O(3) positions. Different models are proposed for the distortion induced by this insertion according to the experimental value, 3.3 [6], found for the ratio of the amount of O(3) to that of O(4). If this ratio is assumed to be 3 and the O(3) atoms are localized about the insertion, then the formation of a short O(4)-O(3) bond would occur. The models not requiring the formation of the short bond correspond to ratios of 2 or 4. In the latter case there would be four displaced O(1), but due to the rigidity of the oxygen octahedra only two O(3) would be bonded to O(4), the other two being the apically opposite oxygen atoms of the same octahedra. © 1990
Recommended from our members
Structural aspects of the phase separation in La2CuO4.032
The average structure of superconducting La CuO has been determined by single-crystal neutron diffraction data. The excess oxygen is located between two adjacent LaO layers. Its presence distorts the apical-oxygen sublattice in such a way that a short OO bond is formed (1.64Å). By scanning several hkl reflections, we have confirmed that a phase separation occurs below room temperature. The peaks of one phase are in agreement with the space group Cmca and the unit cell proposed by Jorgensen et al. and Cox et al.. However, a monoclinic unit cell is needed to index the second phase reflections. © 1989. 2 4.03
MAGNETIC BEHAVIOUR AND PHASE TRANSITION IN [ThCu3] (Mn4)O12
Le composé [ThCu3] (Mn4)o12 appartient à la série des oxydes [AC3] (B4)O12 de structure pérovskite dans lesquels les sites [A] icosaédriques sont occupés par les cations Th4+, les sites [C] plans-carrés par les cations Cu2+ et les sites (B) octaédriques par les cations Mn3+ et Mn4+ en proportions égales. Diverses mesures indiquent un comportement ferrimagnétique avec une température d'ordre TN = 430 K, une aimantation spontanée à 4,2 K de 9 µB/unité de formule et une transition à Tt = 180 K. La structure ferrimagnétique, déduite des expériences de diffraction neutronique est en accord avec les valeurs des interactions magnétiques tirées des mesures d'aimantation et de susceptibilité. La transition Tt a été étudiée par des mesures d'aimantation et de diffraction des rayons X. Elle est caractérisée par une variation thermique anormale du paramètre de maille et du moment magnétique, sans changement de la symétrie cristallographique et magnétique.The compound [ThCu3] (Mn4)O12 belongs to the series of [AC3] (B4) O12 perovskite-like oxides in which the icosahedral sites [A] are occupied by the Th4+ cations, the square planar sites [C] by the Cu2+ cations, and the octahedral sites (B) by the Mn3+ and Mn4+ cations in equal proportion. Previous measurements indicated a ferrimagnetic behavior with an ordering temperature TN= 430 K, a spontaneous magnetization of 9µB/formula unit at 4.2 K and a magnetic transition at Tt = 180 K. The ferrimagnetic structure, as determined from powder neutron diffraction data, is consistent with the values of magnetic interactions that can be estimated from magnetization and susceptibility measurements. The low temperature transition has been studied by magnetization measurements and X-Rays techniques. It seems to be of second order with anomalies in the cubic cell parameter and of the magnetic moments. No changes in cristallographic symmetry and magnetic structure are observed
Recommended from our members
Structural aspects of the phase separation in La2CuO4.032
The average structure of superconducting La2CuO4.032 has been determined by single-crystal neutron diffraction data. The excess oxygen is located between two adjacent LaO layers. Its presence distorts the apical-oxygen sublattice in such a way that a short OO bond is formed (1.64Å). By scanning several hkl reflections, we have confirmed that a phase separation occurs below room temperature. The peaks of one phase are in agreement with the space group Cmca and the unit cell proposed by Jorgensen et al. and Cox et al.. However, a monoclinic unit cell is needed to index the second phase reflections. © 1989
- …