Self-flux-grown BaFeClO crystals exhibiting structures with tunable modulation.

The synthesis and X-ray structural study of the new family of compounds BaFeClO with tunable structural modulation are reported. The framework of the structure has the BaFeO composition, with open hexagonal channels extending along the -axis. The channels are filled with linear [Ba-Cl-Ba] triplets.

Ultrasensitive 3D Aerosol-Jet-Printed Perovskite X-ray Photodetector.

X-ray photon detection is important for a wide range of applications. The highest demand, however, comes from medical imaging, which requires cost-effective, high-resolution detectors operating at low-photon flux, therefore stimulating the search for novel materials and new approaches. Recently, hybrid halide perovskite CHNHPbI (MAPbI) has attracted considerable attention due to its advantageous optoelectronic properties and low fabrication costs.

High-Pressure Synthesis of Rare-Earth Borate-Nitrate Crystals for Second Harmonic Generation.

The crystals of a novel family of rare-earth borate-nitrate compounds, (BO)(NO)NO ( = Pr, Nd), were grown at high-pressure in KAs flux and their crystal structure was determined. The new type of the crystalline structure consists of parallel chains of octahedra connected by common faces and forming the channels with the NO triangular planar motifs in the center, and isolated O tetrahedra separated from each other by N triangular motifs. Each NO triangle is in fact a part of rather unusual (NBO) block consisting of 3 distorted BO tetrahedra around central nitrogen atom.

Incommensurate crystal structure of PbHfO.

Controversy in the description/identification of so-called intermediate phase(s) in PbHfO, stable in the range ∼420-480 K, has existed for a few decades. A synchrotron diffraction experiment on a partially detwinned crystal allowed the structure to be solved in the superspace group Imma(00γ)s00 (No. 74.

Pressure-induced transformation of CHNHPbI: the role of the noble-gas pressure transmitting media.

The photovoltaic perovskite, methylammonium lead triiodide [CHNHPbI (MAPbI)], is one of the most efficient materials for solar energy conversion. Various kinds of chemical and physical modifications have been applied to MAPbI towards better understanding of the relation between composition, structure, electronic properties and energy conversion efficiency of this material. Pressure is a particularly useful tool, as it can substantially reduce the interatomic spacing in this relatively soft material and cause significant modifications to the electronic structure.