Search

In this paper we report structural data for the Li ion conducting garnet-related systems, Li 6 ALa 2 Nb 2 O 12 (A = Ca, Sr). For both systems, the cell is cubic, space group Ia–3d, with the Li ions located in two partially occupied crystallographic sites, Li1 and Li2. High temperature studies for the A = Sr system show an increased occupancy of the Li2 site at higher temperatures. Both samples have high Li ion conductivity in agreement with previous results, and quenching the samples from elevated temperatures leads to an enhancement in the room temperature conductivity, which may be related to either increased occupancy of the Li2 site or reduced Li ion defect clustering/alkaline earth dopant-defect association in the quenched sample.

In this paper the synthesis, conductivity, and structure of the garnet-related Li ion conductor, Li5Nd3Sb2O12, are reported. As for the related Li5La3M2O12 (M = Nb, Ta) materials, this phase shows high Li ion conductivity, with a conductivity at 300 degrees C of 9.2 x 10(-3) S cm(-1). Structural studies using neutron diffraction indicate a cubic unit cell, space group Ia-3d, with Li located in two partially occupied sites. One of the sites is the traditional garnet structure tetrahedral site, while the other Li site is considerably more distorted. Although the latter is nominally a six coordinate site, a close inspection suggests that the coordination could be described as distorted tetrahedral, with the remaining two bonds being significantly longer (approximate to 2.6 angstrom)

Evaluation was made of three enzyme-linked immunosorbent assay (ELISA) formats; varicella-zoster virus (VZV) indirect ELISA; VZV IgM capture using biotin and VZV IgM capture using peroxidase, for the detection of VZV-specific IgM antibodies in human sera. It was observed that there was no significant difference in sensitivity of detection using the three formats but there were important practical differences in the number of steps and hence time for assay completion between the three assay formats. All assays showed some cross-reactivity with sera containing anti-HSV1 antibodies.

In this paper a neutron powder diffraction structural study of the Li ion conducting garnet-related system, Li6SrLa2Nb2O12, is reported. The results show that this phase is cubic, space group Ia-3d, and contains Li in two partially occupied crystallographic sites. The first site, Li1, corresponds to the ideal tetrahedral site in the garnet framework and possesses an occupancy of 0.59(1). The second site, Li2, is significantly more distorted and possesses an occupancy of 0.352(3). Compared to the related Li5La3Nb2O12 System, the Li2 site occupancy is greatly increased, while the Li1 site occupancy is reduced. Despite these large differences in site occupancies, the reported conductivities for Li5La3Nb2O12 and Li6SrLa2Nb2O12 are similar, showing the complexities of these new garnet Li ion conductors

A review of 158 cases of metastatic extradural spinal cord compression referred to three radiotherapy departments shows that the median survival time is less than 3 months, that recovery of motor and sphincter function is uncommon, and that low fraction (2–5) regimens have a similar clinical outcome to more protracted regimens.