New information on the magnetic ordering of the iron ions in bismuth ferrite BiFeO3 was obtained by a study with a high-resolution time-of-flight neutron diffractometer. The observed splitting of magnetic diffraction maxima could be interpreted in terms of a magnetic cycloidal spiral with a long period of 620+or-20 AA, which is unusual for perovskites.

https://iopscience.iop.org/article/10.1088/0022-3719/15/23/020/pdf

Spiral magnetic ordering in bismuth ferrite

Profile analysis of powder neutron diffraction data: Its scope, limitations, and applications in solid state chemistry

Antiferromagnetic structure of LaFeO3 from high resolution tof neutron diffraction

Structure and dynamics of terephthalic acid from 2 to 300 K. I: High-resolution neutron diffraction evidence for a temperature-dependent order-disorder transition: a comparison of reactor and pulsed neutron source powder techniques

Small-angle scattering methods have become routine techniques for the structural characterization of macromolecules and macromolecular assemblies like polymers, (block) copolymers or micelles in the spatial range from a few to hundreds of nanometres. Neutrons are valuable scattering probes, because they offer freedom with respect to scattering length density contrast and isotopic labelling of samples. In order to gain maximum benefit from the allotted experiment time, the instrumental setup must be optimized in terms of statistics of scattered intensity, resolution and accessible range in momentum transfer Q. The new small-angle neutron scattering instrument V16/VSANS at the Helmholtz-Zentrum in Berlin, Germany, augments neutron guide collimation and pinhole optics with time-of-flight data recording and flexible chopper configuration. Thus, the available Q range and the respective instrumental resolution in the intermediate and high momentum transfer regions can be adjusted and balanced to the individual experimental requirements. This renders V16/VSANS a flexible and versatile instrument for soft-matter research.

A new time-of-flight small-angle scattering instrument at the Helmholtz-Zentrum Berlin: V16/VSANS

A high resolution neutron time of flight diffractometer

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A high resolution neutron time of flight diffractometer