文献一覧: 日本結晶学会 (出版者)

1 0 0 0 収束電子回折法による結晶構造・電子密度分布の精密化

著者: 津田健治
出版者: 日本結晶学会
雑誌: 日本結晶学会誌 (ISSN:03694585)
巻号頁・発行日: vol.44, no.5, pp.269-276, 2002-10-31
参考文献数: 16
被引用文献数: 2

A procedure for refining structural parameters and charge densities using convergent-beam electron diffraction (CBED) is described. The procedure is based on the nonlinear least-squares fitting between full dynamical calculations and energy-filtered intensities of two-dimensional higher-order Laue-zone (HOLZ) and zeroth-order Laue-zone (ZOLZ) CBED patterns.

2020-07-28 17:57:39
1 + 0 Twitter

1 0 0 0 OA 生化学・分子生物学と構造生物学の関係およびその研究領域の将来性

著者: 堀越正美
出版者: 日本結晶学会
雑誌: 日本結晶学会誌 (ISSN:03694585)
巻号頁・発行日: vol.38, no.4, pp.296-299, 1996-08-30 (Released:2010-09-30)

2020-06-05 18:05:33
1 + 0 Twitter

1 0 0 0 OA 中性子・放射光による構造物性研究, および結晶学の発展への貢献

著者: 藤井保彦
出版者: 日本結晶学会
雑誌: 日本結晶学会誌 (ISSN:03694585)
巻号頁・発行日: vol.54, no.3, pp.131-138, 2012-06-30 (Released:2012-07-03)
参考文献数: 49

In this article, I have reviewed a series of research on a various phase transitions such as (1) structural phase transitions of perovskite compounds driven by soft phonons, (2) pressure-induced molecular dissociation and metallization observed in solid halogens, and (3) the “Devil's Flower” type phase diagram observed in two compounds with frustrating interactions. Also commented is on the so-called “Small Science at Large Facility” typically symbolized by neutron and synchrotron radiation experiments like the present research.

2020-05-31 19:50:23
1 + 0 Twitter

1 0 0 0 OA ゲル中の結晶成長

著者: 可知祐次
出版者: 日本結晶学会
雑誌: 日本結晶学会誌 (ISSN:03694585)
巻号頁・発行日: vol.16, no.1, pp.115-119, 1974-02-20 (Released:2010-09-30)
参考文献数: 17
被引用文献数: 1

2020-04-11 09:32:30
1 + 0 Twitter

1 0 0 0 OA 計測インフォマティクスとデータベースの統合による客観・高速結晶構造解析

著者: 石井真史上杉文彦小澤哲也
出版者: 日本結晶学会
雑誌: 日本結晶学会誌 (ISSN:03694585)
巻号頁・発行日: vol.62, no.1, pp.35-42, 2020-02-29 (Released:2020-03-06)
参考文献数: 16

Along with the advancement of measurement technologies, a large amount of experimental crystallographic data can be obtained easily, so that objective and rapid analysis suitable for batch process is strongly required. This article introduces recent research on objective and rapid analysis of crystal structure using X-rays or electron beams. For one-dimensional X-ray diffraction pattern, non-negative linear regression (NNLS) using diffraction patterns provided by public database has achieved more objective and faster analysis than conventional manual works. With regard to two-dimensional electron and X-ray diffraction, good objective and rapid analysis was realized for several types of materials by using artificial intelligence (AI) based on convolutional neural network. On the other hand, the sparsity inherent in the diffraction pattern was found to cause a lack of information, and universal applicability of material property prediction using AI that depends on training data is still open to question. However, the fact that AI itself has the potential ability to solve complex images, a breakthrough technology for universal two-dimensional objective and rapid analysis might be found in progressing research.

2020-03-13 09:52:08
1 + 0 Twitter

1 0 0 0 OA マルチフェロイク物質の構造物性研究

著者: 有馬孝尚
出版者: 日本結晶学会
雑誌: 日本結晶学会誌 (ISSN:03694585)
巻号頁・発行日: vol.53, no.5, pp.317-325, 2011-10-31 (Released:2011-11-20)
参考文献数: 34

The interplay between magnetism and electricity in matter has become a central issue of condensed-matter physics. Here I focus on the ferroelectricity induced by magnetic order mostly in frustrated magnets, which is nowadays referred to as magneto-electric (ME) multiferroic. Some distinct types of microscopic origins relevant to the spin-driven ferroelectricity are discussed. It is also shown that the frustration based spin-driven ferroelectrics can exhibit nonlinear and giant ME responses of phase transition type.

2020-03-02 14:59:00
1 はてなブックマーク

1 0 0 0 OA 単結晶中性子回折を利用した精密構造解析

著者: 金子耕士
出版者: 日本結晶学会
雑誌: 日本結晶学会誌 (ISSN:03694585)
巻号頁・発行日: vol.61, no.4, pp.237-242, 2019-12-15 (Released:2019-12-15)
参考文献数: 24

Neutron and X-ray are complementary probes for structural study. Whereas X-ray is superior in terms of brilliance and resolution in general, neutron diffraction has better spatial resolution reflecting the difference in scattering medium; electron and nuclei for X-ray and neutron, respectively. This difference results in the fact that neutron diffraction has higher sensitivity to probe thermal vibration and off-center potential in a crystal. Here, as an example, I will show single crystal neutron diffraction study on ‘rattling’ in rare-earth based filled skutterudite compounds.

2019-12-26 15:03:51
1 + 0 Twitter

1 0 0 0 OA ゼオライトの粉末X線構造解析と解析ソフトウェア高度化への貢献

著者: 池田拓史
出版者: 日本結晶学会
雑誌: 日本結晶学会誌 (ISSN:03694585)
巻号頁・発行日: vol.61, no.4, pp.215-223, 2019-12-15 (Released:2019-12-15)
参考文献数: 41

Zeolites having various properties such as molecular adsorption, molecular sieves and solid-acids are widely used industrially as one of the major inorganic nanoporous materials. Powder X-ray diffraction is the most powerful structural analysis method because most porous materials can only be synthesized as polycrystalline powder. This article briefly describes some of our structural studies on novel zeolites, layered silicates, organic-inorganic hybrid porous materials determined by ab-initio structure analysis using powder X-ray diffraction data. In addition, improvement of the function of Rietveld analysis software was indispensable for the determination of these complex crystal structures. In the past development of multipurpose program RIETAN, we have incorporated many functions such as split-type profile functions, composite background function, MEM-based pattern fitting, and Le Bail method. This enables the highest level of pattern fitting for all angular dispersion powder diffraction patterns and enables efficient ab-initio structure analysis.

2019-12-19 18:12:09
1 + 0 Twitter

1 0 0 0 OA SHELXLで乱れの解析をしよう!

著者: 大場茂
出版者: 日本結晶学会
雑誌: 日本結晶学会誌 (ISSN:03694585)
巻号頁・発行日: vol.57, no.3, pp.147-154, 2015-06-30 (Released:2015-07-01)
参考文献数: 11

The second lesson in this tutorial course of SHELXL includes restraints and constraints of the geometrical as well as the atom displacement parameters, and the strategy of the modeling and refinement of the disordered structures. Treatment of a troublesome disorder of pentane around the special position will be illustrated. The effect of randomly distributed solvents may be corrected either by a bulk solvent approximation or by using PLATON/SQUEEZE as a filter. Some examples of disordered inorganic structures are shown, where the atom occupation factors have been restrained to maintain the electric neutrality of the crystals.

2019-12-11 20:37:27
1 + 0 Twitter

1 0 0 0 OA 岩崎博先生を偲ぶ

著者: 大嶋建一
出版者: 日本結晶学会
雑誌: 日本結晶学会誌 (ISSN:03694585)
巻号頁・発行日: vol.57, no.4, pp.250-251, 2015-08-31 (Released:2015-09-01)

2019-11-24 09:34:15
1 + 1 Wikipedia

1 0 0 0 OA In-situ X線回折測定による構造変化の定量解析と材料開発への応用

著者: 佐藤眞直
出版者: 日本結晶学会
雑誌: 日本結晶学会誌 (ISSN:03694585)
巻号頁・発行日: vol.56, no.4, pp.259-262, 2014-08-31 (Released:2014-09-03)
参考文献数: 6

X-ray diffraction technique is suitable for in-situ observation and quantitative analysis of phenomena occurring in manufacturing process of industries. Its time resolution has been progressed by applying synchrotron radiation. Two cases of industrial application of synchrotron radiation are introduced.

2019-11-10 23:14:01
1 + 1 Twitter

1 0 0 0 OA 高良和武先生を偲んで

著者: 雨宮慶幸
出版者: 日本結晶学会
雑誌: 日本結晶学会誌 (ISSN:03694585)
巻号頁・発行日: vol.61, no.2, pp.136-137, 2019-05-31 (Released:2019-06-05)

2019-11-02 03:47:49
1 + 1 Wikipedia

1 0 0 0 OA 発光性クロミック銅(I)錯体

著者: 加藤昌子
出版者: 日本結晶学会
雑誌: 日本結晶学会誌 (ISSN:03694585)
巻号頁・発行日: vol.57, no.2, pp.110-115, 2015-04-30 (Released:2015-04-30)
参考文献数: 26
被引用文献数: 1

Recent developments of luminescent copper(I) complexes are remarkable and some copper(I) complexes exhibit interesting chromic behaviors of luminescence in response to outer stimuli such as temperature, vapor, and mechanical force. In this article, recent progress of luminescent chromic copper(I) complexes is introduced. Tetranuclear copper(I) clusters with the cubanetype [Cu4I4] core present good examples of luminescence thermochromism, vapochromism, and mechanochromism. In addition, some unique chromic systems are found recently: A dinuclear copper(I) complex, [Cu2(μ-I)2(dmso)2(PPh3)2](dmso = dimethyl sulfoxide) exhibits unique photochromic luminescence on the basis of the flip and release of dmso. Highly luminescent mononuclear copper(I) complexes with ternary ligand systems, [CuI(PPh3)2(L)](L = N-heteroaromatic compounds) are generated by the mechanical grinding.

2019-10-16 21:28:20
1 + 0 Twitter

1 0 0 0 OA ギャップ結合チャネルの構造基盤

著者: 前田将司
出版者: 日本結晶学会
雑誌: 日本結晶学会誌 (ISSN:03694585)
巻号頁・発行日: vol.52, no.1, pp.25-30, 2010-02-28 (Released:2011-02-25)
参考文献数: 27

Here we describe the long awaited atomic structure of the gap junction channel. The structure reveals intra-/inter- monomer interactions, which stabilize the channel structure, and intercellular interactions between two apposing hemichannels. The structure also reveals the pore structure in detail, charge distribution, pore-lining residues and so on. The novel structure, pore funnel, is found on the top of the pore and the relationship with channel gating could be inspected.