The influence of deuteration on the crystal structure of hybrid halide perovskites a temperature dependent neutron diffraction study of FAPbBr3

This paper discusses the full structural solution of the hybrid perovskite formamidinium lead tribromide FAPbBr3 and its temperature dependent phase transitions in the range from 3 K to 300 K using neutron powder diffraction and synchrotron X ray diffraction. Special emphasis is put on the influence of deuteration on formamidinium, its position in the unit cell and disordering in comparison to fully hydrogenated FAPbBr3. The temperature dependent measurements show that deuteration critically influences the crystal structures, i.e. results in partially ordered temperature dependent structural modifications in which two symmetry independent molecule positions with additional dislocation of the molecular centre atom and molecular angle inclinations are presen

a temperature-depen-dent neutron diffraction study of FAPbBr3

This paper discusses the full structural solution of the hybrid perovskite formamidinium lead tribromide (FAPbBr3) and its temperature-dependent phase transitions in the range from 3 K to 300 K using neutron powder diffraction and synchrotron X-ray diffraction. Special emphasis is put on the influence of deuteration on formamidinium, its position in the unit cell and disordering in comparison to fully hydrogenated FAPbBr3. The temperature-dependent measurements show that deuteration critically influences the crystal structures, i.e. results in partially-ordered temperature-dependent structural modifications in which two symmetry-independent molecule positions with additional dislocation of the molecular centre atom and molecular angle inclinations are present

Porous Ti4O7 Particles with Interconnected Pores Structure as High Efficiency Polysulfide Mediator for Lithium Sulfur Batteries

We have designed and synthesized multifunctional Ti4O7 particles with interconnected pores structure by using porous PS P2VP particles as template which can work efficiently as sulfur host material for lithium sulfur batteries. Specifically, the well defined porous Ti4O7 particles exhibit interconnected pores in the interior and high surface area of 592 m2g amp; 8722;1, which not only show the advantage of mesopores for encapsulating of sulfur, but also provide polar surface for chemical binding with polysulfides to suppress their dissolution. Moreover, in order to improve the conductivity of the electrode, a thin layer of carbon has been coated on the Ti4O7 surface without destroying its porous structure. The porous Ti4O7 and carbon coated Ti4O7 particles show significantly improved electrochemical performances as cathode material for Li S batteries as compared with that of TiO2 particle