Yoshinori Fujiki

National Institute for Materials Science

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Takayoshi Sasaki

National Institute for Materials Science

Yū Komatsu

National Astronomical Observatory of Japan

Mamoru Watanabe

The University of Tokyo

Shinzo Yoshikado

Doshisha University

T. Ohachi

Doshisha University

Yoshito Onoda

National Institute for Materials Science

Nobuhiro Ohta

National Yang Ming Chiao Tung University

Toshiyuki Nishio

National Institute of Advanced Industrial Science and Technology

Fujio Izumi

National Institute for Materials Science

Yoshio Ishizawa

National Archives and Records Administration

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National Institute for Materials Science

The University of Tokyo

Institute of Inorganic Chemistry of the Slovak Academy of Sciences

Tohoku University

Kyoto University

University of Tsukuba

Doshisha University

National Institute of Advanced Industrial Science and Technology

Tokyo Institute of Technology

Nihon University

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Growth Reactions of Potassium Titanate Fibers by Slow-cooling Calcination Method

Journal of the Ceramic Association Japan (1983)

Yoshinori Fujiki

チタン酸カリウム繊維の育成について新しく開発した技術 “徐冷焼成法” により研究した. 本育成法は特定の組成物を高温で固相と液相に分解溶融させ, それを分解溶融温度以下まで徐冷することにより, その固相と液相を会合反応させて繊維状結晶を育成する方法である.K2Ti2O5-K2Ti6O13系では一般式K2O・nTiO2中のnが2

10.2109/jcersj1950.91.1052_189

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Citations (5)

Comparison of .ALPHA.-Alumina Crystallization Behavior in the Solution Method between with and without the Addition of Citric Acid.

NIPPON KAGAKU KAISHI (1994)

Toshiyuki Nishio Kazunori Kijima Kanji Kajiwara Yoshinori Fujiki

アルミナ前駆体繊維を得るための溶液系(1)NCS溶液:N(OPri)3-A1(NO3)3-クエソ酸-H20系(A1(OPri)3mol/A1(NO3)3mo1=2,H2Omol/total AImo1=50,total A1 mol /クエン酸mol=10),(2)NS溶液:A1(OPri)3-N(NO3)3-H2O系(A1(OPri)3mol/A1(NO3)3mol=2,H2Omol/total A1 mol=50),に関し,クエン酸の有無が,溶液構造に如何なる影響を与えるのかを,小角X線散乱測定より検討した.これより,NCS溶液及びNS溶液何れの溶液の場合も濃縮に伴い慣性半径は低下したが,その割合はクエン酸を含むNCS溶液の方がクエン酸を含まないNS溶液より大きく,紡糸可能濃度溶液における慣性半径値は前者が50Å,後者が100Å であった.これより,A1(NO3)3に対するA1(OPri)3の量が同一であっても,系にクエン酸を添加した場合と添加しなかった場合で,溶液を構成していると考えられるA1のクラスター構造が異なると共に,その後の濃縮に対する溶液構造の変化に対しても異なった挙動を示すことが明らかとなった.これらの溶液より得られたゲル試料を焼成した場合のα-アルミナへの結晶化速度を定量的X線回折測定で検討したところ,950,1000℃ 及び1050℃ で恒温処理した場合の誘導期間は,NCS試料の方がNS試料より短いことが示された.また,誘導期間を差し引いた時間と転換率との間で成り立つAvrami式より得られる反応速度定数と1/T(処理絶対温度)とのArrheniusプロットより得られた活性化エネルギーは,NCS試料の方がNS試料より若干大きかった.これらは何れも,クエン酸の有無による炭素量における違い,及び溶液構造における違いを反映していると考えられる乾燥ゲル試料での構造の違いが原因していると考えられた.また,Avrami指数は何れの試料の場合も1.6であり,溶液構造を反映すると考えられる試料における構造の違いは核形成一成長の様式には影響しないことがわかった.

Alpha (finance)

10.1246/nikkashi.1994.329

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Synthesis, Structural Characterizations, and Some Chemical Properties of a Fibrous Titanate with a Novel Layer/Tunnel Intergrown Structure

Chemistry of Materials (1994)

Takayoshi Sasaki Mamoru Watanabe Yoshinori Fujiki Yoshizo Kitami

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, Structural Characterizations, and Some Chemical Properties of a Fibrous Titanate with a Novel Layer/Tunnel Intergrown StructureTakayoshi Sasaki, Mamoru Watanabe, Yoshinori Fujiki, and Yoshizo KitamiCite this: Chem. Mater. 1994, 6, 10, 1749–1756Publication Date (Print):October 1, 1994Publication History Published online1 May 2002Published inissue 1 October 1994https://pubs.acs.org/doi/10.1021/cm00046a030https://doi.org/10.1021/cm00046a030research-articleACS PublicationsRequest reuse permissionsArticle Views309Altmetric-Citations35LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts

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10.1021/cm00046a030

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Citations (36)

Ion conduction in one-dimensional ionic conductor CsxGa8Ga8 + xTi16 $minus; xO56 single crystal

Solid State Ionics (1996)

Shinzo Yoshikado Hiroshi Funatomi Ichiro Taniguchi Mamoru Watanabe Yoshito Onoda

Fast ion conductor

Gallate

Crystal (programming language)

10.1016/0167-2738(96)00309-8

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Citations (5)

PREPARATION OF BADDELEVITE (MONOCLINIC ZrO2) USING PbF2 FLUX

The Journal of the Japanese Association of Mineralogists Petrologists and Economic Geologists (1972)

Yoshinori Fujiki Yoshio Suzuki Akira Ono

To prepare large single crystals of monoclinic ZrO2 from PbF2 flux, it was found that the localized cooling method was the most suitable, followed by the combined method of localized and slow cooling, and further followed by the slow cooling method. Single crystals of high quality are in tabular form with {100}, {110}, {111} and [011] faces, whereas many of the twinned crystals are in prismatic form with developed {110} faces. Composition planes of the twinnings are (100) and (110). Polysynthetic (100) twinnings are also found in these crystals.

Monoclinic crystal system

Slow cooling

Flux method

10.2465/ganko1941.67.20

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Immobilization of Divalent Transition Metals from Aqueous Solutions Using Crystalline Hydrated Titania Fibers

Journal of the Ceramic Association Japan (1985)

Yoshinori Fujiki Takayoshi Sasaki Yū Komatsu

高レベル放射性廃液処理の観点から水溶液中の2価遷移金属イオンの固定化がイオン吸着材として結晶性チタニア水和物 (H2Ti2O5・nH2O) 繊維を用いて研究されている. 各金属イオンは2価遷移金属酢酸塩の水溶液から吸着材に飽和吸着させた. 吸着金属イオンは焼結処理により種々なチタン酸塩鉱物の主成分として格子中に固定化された. 銅イオンはルチル及び複雑な結晶構造を有するCu2TiO3相とCu3TiO4相の鉱物集合体に固定化された. 亜鉛イオンはルチルと逆スピネル構造のZn2TiO4相の鉱物集合体に固定化された. マンガン, コバルト, ニッケルの各金属イオンはルチルとイルメナイト構造のMTiO3 (M=Mn, Co, Ni) 相の同じ鉱物集合体に固定化された. これらの固定化体中のルチルは最も多量でマトリックス鉱物として存在している.固定化体中の各金属イオンの浸出率が大気圧及び水熱条件下で測定された. 前者の結果はマンガンイオンの最大3.2×10-9g・cm-2・d-1高浸出抵抗で非常に安定であることを示した. 後者の結果はまたニッケルイオンの最大9.1×10-9g・cm-2・d-1で非常に安定であることを示した.

Divalent

10.2109/jcersj1950.93.1077_225

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Citations (7)

Sorption of Ammonia/Ammonium Ion on Crystalline Hydrous Titanium Dioxide Fibers

Bulletin of the Chemical Society of Japan (1984)

Takayoshi Sasaki Yū Komatsu Yoshinori Fujiki

Abstract The sorption of ammonia/ammonium ion has been studied on crystalline hydrous titanium dioxide fibers with a layer structure, which are prepared from potassium tetratitanate (K2Ti4O9). From the measurement of the distribution coefficient, it was found that this material strongly preferred ammonium ion to sodium ion. The results of the pH titration curves indicated that this material showed a wide range of acidities toward ammonia/ammonium ion and had 2.63 mequiv/g of an apparent capacity which was about a half of the theoretical ion-exchange capacity. The characterizations of the ammonium adsorbed solid phase at various loading levels were carried out by measuring the X-ray powder diffractograms and the water contents. From these studies, it was concluded that the sorption-desorption reaction of ammonia/ammonium ion on this material took place almost reversibly in three stages.

Titanium Dioxide

10.1246/bcsj.57.1331

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Citations (7)

Geology and Ore Deposit of the Kômori Mining District, Japan

Kōzan chishitsu (1964)

Yoshinori Fujiki

10.11456/shigenchishitsu1951.14.36

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Citations (2)

HYDROTHERMAL GROWTH OF ANATASE (TiO₂) CRYSTALS

Chemistry Letters (1975)

Fujio Izumi Yoshinori Fujiki

Abstract Anatase crystals were grown hydrothermally using KF–K2HPO4 solutions. Only rutile was formed in KF solution, whereas the addition of K2HPO4 was effective in crystallizing anatase over a wide range of temperature and pressure. Some properties and the morphological features of the synthetic anatase are described.

Rutile

10.1246/cl.1975.77

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Citations (2)

Growth of mixed fibers of potassium-tetratitanate and -dititanate by slow-cooling calcination method.

Journal of the Ceramic Association Japan (1982)

Yoshinori Fujiki

10.2109/jcersj1950.90.1046_624

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Citations (5)