著者
佐々木 拓生 高橋 正光
出版者
日本結晶成長学会
雑誌
日本結晶成長学会誌 (ISSN:03856275)
巻号頁・発行日
vol.42, no.3, pp.210-217, 2015 (Released:2017-05-31)

Dislocation-mediated strain relaxation during lattice-mismatched InGaAs/GaAs(001) heteroepitaxy was studied through in situ x-ray reciprocal space mapping (in situ RSM). At the synchrotron facility SPring-8, a hybrid system of molecular beam epitaxy and x-ray diffractometry with a two-dimensional detector enabled us to perform in situ RSM at highspeed and high-resolution. Using this experimental setup, the strain relaxation processes were classified into four thickness ranges with different dislocation behavior. In order to discuss this observation quantitatively, a strain relaxation model was proposed based on the Dodson-Tsao's kinetic model, and its validity was demonstrated by good agreement with the experimental residual strain. In addition to the single InGaAs layer, strain relaxation processes in multi-layer structures are discussed.
著者
三浦 巌 高橋 正典 青木 聡之 安芸 晋冶
出版者
日本結晶成長学会
雑誌
日本結晶成長学会誌 (ISSN:03856275)
巻号頁・発行日
vol.31, no.3, 2004
参考文献数
1

The usefulness of low-power P MR in the study of polymorphous and molecular dynamics was examined. The milling, high temperature and humidification effect on amino acids crystal were studied by PMR. The results of these experiments were demonstrated that the normal liquid PMR system can be used as a powerful analytical tool of the solid materials.
著者
川喜田 哲哉
出版者
日本結晶成長学会
雑誌
日本結晶成長学会誌 (ISSN:03856275)
巻号頁・発行日
vol.23, no.5, pp.430-435, 1996-12-25 (Released:2017-05-31)
参考文献数
4
被引用文献数
1

The effects of impurities present in crystallizeds. solution on the change in the crystal habit of aspartic acid crystals were investigated. Aspartic acid is produced by an enzymatic method using fumaric acid as raw matcrials in an industrial scale. The characteristics of this method are to produce very limited amounts of sub-products such as other amino acids, compared with conventional fermentation methods. When aspartic acids were crystallized by a continuous crystallization at 50℃ with neutrallization by 98% sulfuric acid, the changes in the crystal habit from plate to pillar forms were observed with the operation times elapsed, maintaining the α form crystal structure.The plate form crystallized under the higher supersaturation in the vicinity of 5g/dl, irrespective of the existence of impurities. On the other hand, the impurities in the solution, mainly fumaric acid and malic acid, inhibited the growth rate along b-axis direction and the crystal habit changes to the pillar form crystals, when the supersaturation decreased as low as 2g/dl.
著者
山本 英二
出版者
日本結晶成長学会
雑誌
日本結晶成長学会誌 (ISSN:03856275)
巻号頁・発行日
vol.23, no.5, pp.422-429, 1996-12-25 (Released:2017-05-31)
参考文献数
48

This article reviews recent studies on the crystallization phenomena and operation for the preparation of pharmaceuticals and functional foods. Main interests are focused on selective crystallizotion of polymorphs and solvent mediated phase transition, clathrative crystallization of green tea polyphenol with cyclodextrin, crystallization of maltose accompanying anomerization process, crystallinity and functionalities of drug, and the modification ofcrystal habits by controlling agitation condition for improvement of sparation by filtration.
著者
芦澤 一英
出版者
日本結晶成長学会
雑誌
日本結晶成長学会誌 (ISSN:03856275)
巻号頁・発行日
vol.30, no.3, pp.21-22, 2003-07-05 (Released:2017-05-31)
参考文献数
2

In the pharmaceutical drug development, the following are carried out : Polymorphic search and physical properties evaluation for choosing the polymorphism it chooses optimum crystal form of the drug substance. In next stage, the research of the scale-up for manufacturing process and formulation of the drug substance is carried out. In this paper, the case of the research on polymorphism and evaluation in pharmaceutical drug development is introduced.
著者
趙 新洛 安藤 義則
出版者
日本結晶成長学会
雑誌
日本結晶成長学会誌 (ISSN:03856275)
巻号頁・発行日
vol.32, no.5, pp.377-383, 2005-12-31

アーク放電法は,安くて高結晶性単層カーボンナノチューブ(SWNTs)を作製できる有力な方法である.この解説では,アーク放電法によるSWNTsの成長条件をレビューすると共に,SWNTsの精製方法にも言及する.一方法として,陽極に対して約30°の鋭角に陰極を配置することによって,陰極堆積物を大幅に減らすことができた.蒸発された陽極の8割が綿状のカーボン煤になり,1分当たりの生成量は約1グラムに達した.他方,高純度・高結晶性SWNTsは,H_2ガスを含んだ混合ガス(H_2-Ar,H_2-N_2,H_2-Ne,H_2-Kr,H_2-Xe)中で,1at%Fe触媒入りカーボン電極のアーク放電蒸発によって大量作製された.作ったままのSWNTsは,大量精製法である液相法によって簡単に精製でき,90at%以上の高純度のものが得られた.
著者
治田 将 今井 華央 堀内 宏明 奥津 哲夫
出版者
日本結晶成長学会
雑誌
日本結晶成長学会誌 (ISSN:03856275)
巻号頁・発行日
vol.40, no.2, pp.91-97, 2013-07

Photochemically induced protein crystallization by protein's multiphoton excitation based on enhanced field of localized surface plasmon resonance (LSPR) of gold nanostructures was investigated. As strong photons-molecules coupling fields, gold nanostructures composed of nanoblocks ware used. Crystallization probability depends on the excitation photon fluence, which indicates 3 photons absorption process occurred. We developed crystallization plates equipped with strong photon-molecule coupling field made of gold thin films that enhances crystallization frequency.
著者
宮澤 信太郎
出版者
日本結晶成長学会
雑誌
日本結晶成長学会誌 (ISSN:03856275)
巻号頁・発行日
vol.23, no.2, pp.117-119, 1996-06-25
著者
角谷 均
出版者
日本結晶成長学会
雑誌
日本結晶成長学会誌 (ISSN:03856275)
巻号頁・発行日
vol.39, no.4, pp.164-169, 2013-01

高圧高温下(HPHT)での温度差法において,高純度な炭素源とFe-Co-Ti溶媒,高結晶性の(001)種結晶を用い,HPHT条件を高精度に制御して,最大径12mmの高品質IIa型単結晶ダイヤモンドを合成した.このダイヤモンドは,天然あるいは従来の合成のダイヤモンドに比べて欠陥密度がはるかに少なく,非常に高い結晶性を有する.特に,(001)種結晶に成長させた結晶の種結晶上部の(001)成長セクター内には転位欠陥や積層欠陥はほとんど見られないことがX線トポグラフ測定より明らかとなった.そこで,合成領域内の低温側で合成温度を厳格に制御して,この(001)成長セクターが優勢な結晶形をもつダイヤモンドを合成したところ,5×5mm^2以上の無欠陥部を含む結晶が得られた.
著者
砂川 一郎
出版者
日本結晶成長学会
雑誌
日本結晶成長学会誌 (ISSN:03856275)
巻号頁・発行日
vol.1, no.1, pp.18-19, 1974-11-01
著者
檀 武弘 村松 祐治 山縣 敏博 星本 健一 木村 隆
出版者
日本結晶成長学会
雑誌
日本結晶成長学会誌 (ISSN:03856275)
巻号頁・発行日
vol.21, no.4, pp.385-390, 1994-09-25

Under microgravity conditions, interdiffusion experiments of molten Au-Ag alloy system were undertaken. The diffusion in the flight specimens was faster than that in the ground ones, and their concentration curves deviated from theoretical ones, extraordinarily. These results may be ascribed to Marangoni convection flow, which became dominant under microgravity conditions in place of the gravitational convection one. It may be caused by the existence of free surface and a very large concentration gradient at the interface of the diffusioncouple type of specimen. The suppression of free surface formation and consideration for the wettability between molten alloy and crucible material will be indispensable.