Powder Sample Susceptibility for Single Ion Magnets with S=1,3/2 with Rhombic Anisotropy

CaB 6 single crystals were synthesized by the Al flux method and the Fe -impurity concentration in the crystal was measured using the PIXE method. As a result, we found that the amount of the Fe impurity, included in a CaB 6 powder sample used as a starting material, is drastically reduced after the synthesis process. Lightly La doped CaB 6 single crystals were also synthesized and the La concentration was determined by PIXE.

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X-ray Single-Crystal Structural Analysis of a Magnetically Oriented Monoclinic Microcrystal Suspension of α-Glycine

Crystals ◽

10.3390/cryst9110561 ◽

2019 ◽

Vol 9 (11) ◽

pp. 561 ◽

Cited By ~ 1

Author(s):

Tatsuya Tanaka ◽

Chiaki Tsuboi ◽

Kazuaki Aburaya ◽

Fumiko Kimura ◽

Masataka Maeyama ◽

...

Keyword(s):

Crystal Structure ◽

Magnetic Susceptibility ◽

Single Crystal ◽

Magnetic Energy ◽

Powder Sample ◽

Single Crystal Structure ◽

X Ray ◽

Crystal Structural ◽

The Relationship ◽

Good Agreement

We previously reported on a method for X-ray single-crystal structure determination from a powder sample via a magnetically oriented microcrystal suspension (MOMS). The method was successfully applied to orthorhombic microcrystals (L-alanine, P212121). In this study, we apply this method to monoclinic microcrystals. Unlike most of the orthorhombic MOMSs, monoclinic MOMSs exhibit two or four orientations with the same magnetic energy (we refer to this as twin orientations), making data processing difficult. In this paper, we perform a MOMS experiment for a powder sample of monoclinic microcrystal (α-glycine, P21/n) to show that our method can also be applied to monoclinic crystals. The single-crystal structure determined in this work is in good agreement with the reported one performed on a real single crystal. Furthermore, the relationship between the crystallographic and magnetic susceptibility axes is determined.

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Neutron scattering cross section of diamond nanoparticles

EPJ Web of Conferences ◽

10.1051/epjconf/201921910005 ◽

2019 ◽

Vol 219 ◽

pp. 10005

Author(s):

Kenji Mishima ◽

Toshiya Otomo ◽

Kazutaka Ikeda ◽

Hidetoshi Ohshita

Keyword(s):

Cross Section ◽

Cross Sections ◽

Coherent Scattering ◽

Theoretical Description ◽

Powder Sample ◽

Scattering Cross Section ◽

Hard Sphere Model ◽

Particle Structure ◽

Diamond Nanoparticles ◽

Scattering Cross

Due to their large coherent scattering cross section, diamond nanoparticles (DNPs) are considered as a promising candidate material for a new neutron reflector. For investigation of scattering cross sections of packed samples, we have developed a technique for mechanical compression of DNP powder. Application of 220 MPa allowed us to increase the bulk density from 0.40 g/cm3 to 1.1 g/cm3. The differential cross sections of uncompressed and packed samples were measured using the high-intensity total diffractometer instrument NOVA at J-PARC, covering transfer wavenumbers (q) from 0.6 to 100 nm−1. The q dependence for the compressed sample agreed with the theoretical expectation derived from the Born approximation applied to homogeneous spheres with inclusion of a hard-sphere model to account for the inter-particle structure, whereas the results obtained from the powder sample disagreed. This implies that the theoretical description does not well represent the mesoscopic structure of the DNP powder sample.

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