2000 Fiscal Year Annual Research Report

有機金属錯体を出発原料とする新しい機能性ナノサイズセラミックスの調整と応用

Research Project

Project/Area Number	10045045
Research Institution	Ehime University
Principal Investigator	定岡芳彦愛媛大学, 工学部, 教授 (50036422)
Co-Investigator(Kenkyū-buntansha)	青野宏通愛媛大学, 工学部, 講師 (00184052)
Keywords	多核錯体 / 熱分解 / ペロブスカイト型酸化物 / ゾルゲル法 / ガスセンサ / NO_2 / CO_2 / 表面分析
Research Abstract	愛媛大学工学部とイタリアのローマ大学"Tor Vergata"との共同で、有機金属錯体の熱分解による機能性複合酸化物の合成について研究を行なった。まず、多核複金属有機錯体を合成し、これを熱分解することによりペロブスカイト型複合酸化物を得る新しい合成法について検討を行なった。材料としては、LaMn-系,LaFe-系などについて、特に低温における複合酸化物の生成挙動を調べた。その結果、LaMn-系では600℃で結晶化が始まり、この温度では約20nmの均質微粒子が得られた。LaFe-系は、希土類とFeの系で最も低温で複合酸化物を形成することがわかっており、350℃の低温で長時間焼成することによりLaFeO_3微粒子が得られている。さらに、3成分の錯体の熱分解を行ない、La_<1-x>Sm_xFeO_3、YBa_2Cu_3O_7などの様々な複合酸化物の均質微粒子が合成され、その結晶のキャラクタリゼーションがなされた。さらに、この方法で、SmFeO_3を合成しNO_2ガスセンサへ応用したところ、一般的に用いられる固相反応法により得たものよりもかなり優れたセンサ材料になりうることが明かになり、表面分析の結果より多核錯体法で作製した方が、吸着サイトの数が多く均質性が優れていた。一方、ゾルーゲル法により新しいNa^+イオン伝導体の開発も行ない、極めて緻密で伝導度の高いセラミック固体電解質を作製した。これを用いて、CO_2ガスセンサへ応用したところ優れた起電力応答が得られた。

Research Products
(15 results)

All Other

All Publications (15 results)

[Publications] E.Traversa,P.Nunziante,M.Sakamoto,Y.Sadaoka,M.C.Cristina,G.Martinelli: "Thermal Evolution of the Microsrstructure of Nanosized LaFeO_3 Powders from the Thermal Decomposition of a Heteronuclear Complex, La[Fe(CN)_6]・5H_2O"J.Mater.Res.. 13. 1335-1344 (1998)
[Publications] E.Traversa,P.Nunziante,M.Sakamoto,Y.Sadaoka,G.Martinelli: "Synthesis and Structural Characterization of Trimetallic Perovskite-type Oxides, LaFe_xCo_<1-x>O_3, by the Thermal Decomposition of Cyano-complexes, La[Fe_xCo_<1-x>(CN)_6]・nH_2O"Materials Research Bulletin. 33(5). 673-681 (1998)
[Publications] M.C.Carotta,G.Martinelli,Y.Sadaoka,P.Nunziante,E.Traversa: "Gas-sensitive Electrical properties of Perovskite-type SmFeO_3 Thick Films"Sens.and Actuators. B48(1-3). 270-276 (1998)
[Publications] Y.Sadaoka,H.Aono,E.Traversa,M.Sakamoto: "Thermal Evolution of Nanosized LaFeO_3 Powders from a Heteronuclear Complex, La[Fe(CN)_6]・nH_2O"J.Alloys and Compounds. 278. 135-141 (1998)
[Publications] E.Traversa,L.Montanaro,H.Aono,Y.Sadaoka: "Sol-Gel Synthesis, Sintering and Electrical Properties of Nasicon Having New Compositions, Na_3Zr_<2-(x/4)>Si_<2-x>P_<1+x>O_<12>"Ceram.Trans.. 95. 225-234 (1998)
[Publications] E.Hasegawa,H.Aono,T.Igoshi,M.Sakamoto,E.Traversa,Y.Sadaoka: "Preparation of YBa_2Cu_3O_<7-x> by the Thermal Decomposition of a Heteronuclear Complex, CuY_<1/3>Ba_<2/3>(dhbaen)(NO_3)_<1/3>(H_2O)_3,"J.Alloys and Compounds. 287. 150-158 (1999)
[Publications] E.Traversa,S.Villanti,G.Gusmano,H.Aono,Y.Sadaoka: "Design of Ceramic Materials for Chemical Sensors : SmFeO_3 Thick Films Sensitive to NO_2"J.Am.Ceram.Soc.. 82(9). 2442-2450 (1999)
[Publications] H.Aono,M.Tsuzaki,A.Kawaura,M.Sakamoto,E.Traversa,Y.Sadaoka: "LaMnO_3 Fine Powder Prepared by the Thermal Decomposition of a Heteronuclear Complex, LaMn(dhbaen)(OH)(NO_3)(H_2O)_4,"Chem.Lett.. 1999(11). 1175-1176 (1999)
[Publications] E.Traversa,G.Gusmano,B.Allieri,L.E.Depero,L.Sangaletti,H.Aono,Y.Sadaoka: "Synthesis and Characterization of Trimetallic Rare Earth Orthoferrites, La_xSm_<1-x>FeO_3"The Korean Journal of Ceramics. 6(1). 21-26 (2000)
[Publications] E.Traversa,Y.Sadaoka,M.C.Carotta,G.Martinelli: "Environmental Monitoring Field tests Using Screen-Printed Thick Film Sensors Based on Semoconducting Oxides"Sens.and Actuators. B65(5). 181-185 (2000)
[Publications] E.Traversa,H.Aono,Y.Sadaoka,L.Montanaro: "Electrical Properties of Sol-Gel Processed NASICON Having New Compositions"Sens.and Actuators. B65(5). 204-208 (2000)
[Publications] E.Traversa,P.Nunziante,L.Sangaletti,B.Allieri,L.E.Depero,H.Aono,Y.Sadaoka: "Synthesis and Structural Characterization of Trimetallic Perovskite-type Rare Earth Orthoferrites, La_xSm_<1-x>FeO_3"J.Am.Ceram.Soc.. 83(5). 1087-1092 (2000)
[Publications] E.Traversa,L.Montanaro,H.Aono,Y.Sadaoka: "Synthesis of NASICON with New Compositions for Electrochemical Carbon Dioxide Sensors"J.Electroceramics,. (in press).
[Publications] H.Aono,M.Sato,E.Traversa,M.Sakamoto,Y.Sadaoka: "Design of Ceramic Materials for Chemical Sensors : Effect of SmFeO_3 Processing on its Surface and Electrical Properties"J.Am.Ceram.Soc.,. (in press).
[Publications] H.Aono,M.Tsuzaki,A.Kawaura,M.Sakamoto,E.Traversa,Y.Sadaoka: "Preparation of Nanosized Perovskite-type LaMnO_3 Powders Using the Thermal Decomposition of a Heteronuclear Complex, LaMn(dhbaen)(OH)(NO_3)(H_2O)_4"J.Am.Ceram.Soc.,. (in press).

2000 Fiscal Year Annual Research Report

有機金属錯体を出発原料とする新しい機能性ナノサイズセラミックスの調整と応用

Principal Investigator

定岡 芳彦 愛媛大学, 工学部, 教授 (50036422)

Research Products

[Publications] E.Traversa,P.Nunziante,M.Sakamoto,Y.Sadaoka,M.C.Cristina,G.Martinelli: "Thermal Evolution of the Microsrstructure of Nanosized LaFeO_3 Powders from the Thermal Decomposition of a Heteronuclear Complex, La[Fe(CN)_6]・5H_2O"J.Mater.Res.. 13. 1335-1344 (1998)

[Publications] M.C.Carotta,G.Martinelli,Y.Sadaoka,P.Nunziante,E.Traversa: "Gas-sensitive Electrical properties of Perovskite-type SmFeO_3 Thick Films"Sens.and Actuators. B48(1-3). 270-276 (1998)

[Publications] Y.Sadaoka,H.Aono,E.Traversa,M.Sakamoto: "Thermal Evolution of Nanosized LaFeO_3 Powders from a Heteronuclear Complex, La[Fe(CN)_6]・nH_2O"J.Alloys and Compounds. 278. 135-141 (1998)

[Publications] E.Traversa,L.Montanaro,H.Aono,Y.Sadaoka: "Sol-Gel Synthesis, Sintering and Electrical Properties of Nasicon Having New Compositions, Na_3Zr_<2-(x/4)>Si_<2-x>P_<1+x>O_<12>"Ceram.Trans.. 95. 225-234 (1998)

[Publications] E.Hasegawa,H.Aono,T.Igoshi,M.Sakamoto,E.Traversa,Y.Sadaoka: "Preparation of YBa_2Cu_3O_<7-x> by the Thermal Decomposition of a Heteronuclear Complex, CuY_<1/3>Ba_<2/3>(dhbaen)(NO_3)_<1/3>(H_2O)_3,"J.Alloys and Compounds. 287. 150-158 (1999)

[Publications] E.Traversa,S.Villanti,G.Gusmano,H.Aono,Y.Sadaoka: "Design of Ceramic Materials for Chemical Sensors : SmFeO_3 Thick Films Sensitive to NO_2"J.Am.Ceram.Soc.. 82(9). 2442-2450 (1999)

[Publications] H.Aono,M.Tsuzaki,A.Kawaura,M.Sakamoto,E.Traversa,Y.Sadaoka: "LaMnO_3 Fine Powder Prepared by the Thermal Decomposition of a Heteronuclear Complex, LaMn(dhbaen)(OH)(NO_3)(H_2O)_4,"Chem.Lett.. 1999(11). 1175-1176 (1999)

[Publications] E.Traversa,G.Gusmano,B.Allieri,L.E.Depero,L.Sangaletti,H.Aono,Y.Sadaoka: "Synthesis and Characterization of Trimetallic Rare Earth Orthoferrites, La_xSm_<1-x>FeO_3"The Korean Journal of Ceramics. 6(1). 21-26 (2000)

[Publications] E.Traversa,Y.Sadaoka,M.C.Carotta,G.Martinelli: "Environmental Monitoring Field tests Using Screen-Printed Thick Film Sensors Based on Semoconducting Oxides"Sens.and Actuators. B65(5). 181-185 (2000)

[Publications] E.Traversa,H.Aono,Y.Sadaoka,L.Montanaro: "Electrical Properties of Sol-Gel Processed NASICON Having New Compositions"Sens.and Actuators. B65(5). 204-208 (2000)

[Publications] E.Traversa,P.Nunziante,L.Sangaletti,B.Allieri,L.E.Depero,H.Aono,Y.Sadaoka: "Synthesis and Structural Characterization of Trimetallic Perovskite-type Rare Earth Orthoferrites, La_xSm_<1-x>FeO_3"J.Am.Ceram.Soc.. 83(5). 1087-1092 (2000)

[Publications] E.Traversa,L.Montanaro,H.Aono,Y.Sadaoka: "Synthesis of NASICON with New Compositions for Electrochemical Carbon Dioxide Sensors"J.Electroceramics,. (in press).

[Publications] H.Aono,M.Sato,E.Traversa,M.Sakamoto,Y.Sadaoka: "Design of Ceramic Materials for Chemical Sensors : Effect of SmFeO_3 Processing on its Surface and Electrical Properties"J.Am.Ceram.Soc.,. (in press).

[Publications] H.Aono,M.Tsuzaki,A.Kawaura,M.Sakamoto,E.Traversa,Y.Sadaoka: "Preparation of Nanosized Perovskite-type LaMnO_3 Powders Using the Thermal Decomposition of a Heteronuclear Complex, LaMn(dhbaen)(OH)(NO_3)(H_2O)_4"J.Am.Ceram.Soc.,. (in press).

定岡芳彦愛媛大学, 工学部, 教授 (50036422)