We present evidence for possibly the highest magnetic ordering temperature in any compound without $3d$ transition elements. Neutron powder diffraction measurements, at both time-of-flight and constant wavelength sources, were performed on two independently prepared ${\mathrm{SrTcO}}_3$ powders. ${\mathrm{SrTcO}}_3$ adopts a distorted perovskite structure with $G$-type antiferromagnetic ordering and has a moment of $1.87(4){\mu }_B$ per Tc cation at room temperature with an extraordinarily high Néel point close to $750°\mathrm{C}$. Electronic structure calculations reveal extensive mixing between the technetium $4d$ states and oxygen states proximal to the Fermi level. This hybridization leads to a close relationship between magnetic ordering temperature and moment formation in ${\mathrm{SrTcO}}_3$.

Porous nanocrystalline Zn/TiO₂ materials were synthesized employing agarose gel as a template, achieving a maximum Zn-doping concentration of around 2 at.%. Low Zn-doping concentrations (e.g. <1 at.%) improved the photocurrent of the dye-sensitized solar cell when these materials were applied as the working electrode, as n-type doping favors electron transportation. Compared to the efficiency of the undoped sample, 6.7%, the 0.5 at.% sample showed a much higher efficiency of 7.6%. Further doping decreases the performance of the device as it introduces deficiencies that act as electron–hole recombination centers.

The structure of the perovskite SrTcO₃ has been investigated using both synchrotron X-ray and neutron powder diffraction. At room temperature SrTcO₃ is orthorhombic as a consequence of cooperative tilting of the corner sharing TcO₆ octahedra. The tilts are sequentially removed as the sample is heated with the oxide displaying the sequence of structres Pnma → Imma → I4/mcm → Pmm. Neutron powder diffraction data collected in the temperature range 4–1023 K indicate that SrTcO₃ has G-type antiferromagnetic structure, in which each Tc moment is antiparallel to its six nearest neighbours, below ∼1000 K. The magnetic structure is collinear antiferromagnetic with the technetium moments parallel to c-axis and can be described by the propagation vector k = [0,0,0] and the basis vector (0,0,A_z). The same magnetic structure is observed in each of the four crystal structures.