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Rigaku Journal (ISSN 2187-9974)

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Winter 2023, Volume 39, No. 1


Winter 2023, Vol. 39, No. 1

X-ray diffraction measurement of layered manganese dioxide that can store/release heat repeatedly by desorbing/absorbing water molecules to/from moist air

Norihiko L. Okamoto, Takuya Hatakeyama, Hongyi Li and Tetsu Ichitsubo

Discovery of thermal storage materials that can utilize low-temperature waste heat

We have discovered that layered manganese dioxide (birnessite, δ-MnO₂) can store/release heat through an intercalation mechanism in which water molecules in a moist atmosphere are deintercalated/intercalated between the layers. The material has been found to have an excellent balance...

3D molecular visualization of a human antibody by MAXS measurement reveals significant differences between the solution and crystalline states

Takashi Matsumoto, Akihito Yamano, and Takashi Sato

X-ray solution scattering experiments have been utilized to analyze structures and conformational changes of biological macromolecules. Those experiments employ X-ray scattering data in a small-angle region, a technique called Small Angle X-ray Scattering (SAXS). SAXS experiments often focus on the macroscopic shapes and sizes of molecules. However, in principle, the...

Atomic-scale structural analysis by total scattering profiles

Masatsugu Yoshimoto*

In the past, total scattering data was used to obtain the pair distribution function (PDF) G(r). However, it has become clear that it is also possible to calculate characteristic values related to the physical properties of materials from the total scattering data. In this paper, we introduce two applications using...

X-ray fluorescence analysis of liquid samples without helium gas

Yuri Maruko

Helium gas is becoming more difficult to obtain these days due to decreased supply and increased demand. In X-ray fluorescence analysis, helium gas is often used in the analysis of liquid samples, while processing samples as solids is possible under a vacuum. In this article we introduce two liquid sample...

Basics of X-ray CT reconstruction--Principles and applications of iterative reconstruction

Takumi Ohta

This article describes the principles and applications of iterative reconstruction in X-ray computed tomography. We use several real examples to show how iterative reconstruction can produce higher-quality reconstructed images than the conventional reconstruction method.

This article describes the principles and applications of iterative reconstruction (IR) methods. Section 2 describes the...

NEX CG II Advanced Cartesian Geometry EDXRF

NEX CG II is a multi-element, multi-purpose energy dispersive X-ray fluorescence (EDXRF) spectrometer that performs rapid qualitative and quantitative trace elemental analyses and addresses needs across many industries. This next-generation, high-end spectrometer is ideal for trace heavy metal and halogen analysis, which is in increasing demand for several sectors. These...

Summer 2022, Volume 38, No. 2


Summer 2022, Vol. 38, No. 2

Quantification analysis of cement materials

Atsushi Ohbuchi, Takahiro Kuzumaki, Miki Kasari and Tetsuya Ozawa

X-ray diffractometry is widely used for quality control and process control in cement. This article presents an accurate and precise quantification method for free lime in a clinker material and an accurate quantification method of the admixtures in a blended cement. The partial accumulation measurement was used to make a...

Three-dimensional modeling for complex structures based on small-angle X-ray scattering

Tomoyuki Iwata

Three-dimensional real-space modeling for hierarchical materials by matching experimental and simulated small-angle X-ray scattering patterns is proposed. The positional arrangements of small primary particles in the cell are estimated by the reverse Monte Carlo modeling and the simulated SAXS patterns are derived from these models. This modeling has been applied...

Compact X-ray Diffractometer MiniFlex XpC

X-ray diffraction (XRD) has traditionally been utilized mainly in the R&D field. Recently, however, opportunities to use XRD in the QA/QC field are increasing since the XRD technique has become easier to use with the popularization of desktop X-ray diffractometers and high-speed 1D semiconductor strip detectors (1D SSD). Rigaku has...