BiFeO 3

The crystal and magnetic structure of $BiFeO_3$ have been studied with the use of high resolution neutron diffraction between 5 K and 300 K. The atomic coordinates in $BiFeO_3$ are almost unchanged between 5 K and 300 K

BiFeO3BiFeO_3 Crystal Structure at Low Temperatures

The crystal and magnetic structure of $BiFeO_3$ have been studied with the use of high resolution neutron diffraction between 5 K and 300 K. The atomic coordinates in $BiFeO_3$ are almost unchanged between 5 K and 300 K

Investigation of Crystal and Magnetic Structure of BiFeO3\text{}_{3} Using Neutron Diffraction

Polycrystalline material obtained from the ground single crystal of BiFeO$\text{}_{3}$ reported as not having the superstructure, shows the superstructure reflections in neutron diffraction pattern. The determined magnetic moment of antiferromagnetically ordered Fe$\text{}^{3+}$ ions is μ$\text{}_{Fe}$ = (3.70±0.03)μ$\text{}_{B}$ at 293 K

Thermal Lattice Parameters Variation of CaCuxMn7−xO12CaCu_xMn_{7-x}O_{12} Compounds with Trigonal Crystal Structure

We report the crystal structure evolution of $CaCu_{0.2}Mn_{6.8}O_{12}$ as a function of temperature between 10 K and 290 K. The analysis of the diffraction data is carried out with the Rietveld method applied to the average trigonal structure of $CaCu_{0.2}Mn_{6.8}O_{12}$. The x = 0.2 member shows similar low temperature extrema for the unit cell parameter evolution as the previously reported x = 0.1 and x = 0 members of the $CaCu_xMn_{7-x}O_{12}$ system. All magnetic and crystallographic transition temperatures indicated by the unit cell parameter evolution obtained by powder X-ray diffraction methods systematically decrease with increasing Cu content, x

Domain size effects in neutron and SR powder diffraction studies of some oxides

We discuss the properties of synchrotron radiation (SR) and neutron powder diffraction investigations of the crystal and magnetic structure of solids. Special emphasis is paid to the analysis of the full width at half maximum (FWHM) of the observed Bragg reflections and its relation with the size of the coherently ordered regions of the material. Two specific examples are discussed: a SR powder diffraction study of the crystal structure of the hexaferrite BaSn2Fe4O11 and a neutron powder diffraction study of the magnetic ordering of the magnetic moments of manganese ions in the distorted perovskite system CaMn7O12