Low-temperature synthesis of ceramics through unstable complexes

通过不稳定配合物低温合成陶瓷

• 批准号: 05555234
• 负责人: INAGAKI Michio
• 金额: $ 6.4万
• 依托单位: Hokkaido University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-05555234/
• 关键词: Complexes; Ceramics; Low-temperature synthesis; Ferrite; Spinel

The purpose of the present research was to establish the processes for the synthesis of double oxide ceramics at low temperatures, if possible at room temperature, through certain unstable complexes of ethlene glycole and hydrazine. The crystalline oxides were directly synthesized, not via hydroxide.ZnFe_20_4 with spinel structure was synthesized in the shape of balloon with thin wall by passing through the complexes of ethylene glycole. The balloons of Fe_20_3 were also prepared and converted to ZnFe_20_4 balloons with wavy-line texture by the solid-state reaction with ZnO.LiMn_20_4 spinel which was a candidate for cathode materials for lithium rechargeable batteries was prepared in a thin film at low temperature as 400ﾟC.Using hydrazine monohydrate, crystalline fine powder of ZnFe_20_4 was precipitated from aqeous solution near room temperature. Using ammonia, ZnFe_20_4 powder was also precipitated in a wide range of concentration of starting metal salts. In the case of hydrazine, it was necessary to limit the concentration of metal salts in a narrow range, in order to avoid the formation of hydrazine complexes and also of hydroxides. The precipitation conditions for the spinels, Fe_30_4 , NiFe_20_4 and CoFe_20_4, in crystalline powders were determined. These crystalline ferrites were found to be formed through corresponding green-rust structures.

本研究的目的是建立在低温下，如果可能的话，在室温下，通过乙二醇和肼的某些不稳定的配合物的双氧化物陶瓷的合成工艺。采用直接法合成了ZnFe_2O_4晶体，通过乙二醇的配合物，合成了具有尖晶石结构的球形薄壁ZnFe_2O_4。在400 ℃的低温条件下制备了尖晶石LiMn_2O_4薄膜。在室温附近从水溶液中析出ZnFe_2O_4结晶细粉。使用氨水，ZnFe_2O_4粉末也在较宽的起始金属盐浓度范围内沉淀。在肼的情况下，有必要将金属盐的浓度限制在窄范围内，以避免形成肼络合物以及氢氧化物。确定了尖晶石Fe_3O_4、NiFe_2O_4和CoFe_2O_4在晶体粉末中的析出条件。发现这些结晶铁氧体是通过相应的绿锈结构形成的。

项目成果

T.Tsumura, A.Shimizu and M.Inagaki: "Synthesis of LiMn_20_4 spinel via tartrate" J.Mater.Chem.3. 995-996 (1993)

T.Tsumura、A.Shimizu 和 M.Inagaki：“通过酒石酸盐合成 LiMn_20_4 尖晶石”J.Mater.Chem.3。

T.Tsumura: "Synthesis of LiMn_2O_4 Spinel via Tartrates" J.Mater.Chem.3. 995-996 (1993)

T.Tsumura：“通过酒石酸盐合成 LiMn_2O_4 尖晶石”J.Mater.Chem.3。

M.Ueda, S.Shimada and M.Inagaki: "Preparation of a-Fe_20_3 ballons and reaction with ZnO powder" Solid State Ionics. 63-65. 154-158 (1993)

M.Ueda、S.Shimada 和 M.Inagaki：“a-Fe_20_3 球的制备及其与 ZnO 粉末的反应”固态离子学。

M.Ueda, S.Shimada and M.Inagaki: "Preparation of spinel-type ferrites with ballon shape and control of their surface texture" J.Soc.Mater.Eng.Resorces of Japan. 7. 46-51 (1994)

M.Ueda、S.Shimada 和 M.Inagaki：“球状尖晶石型铁氧体的制备及其表面纹理的控制”日本 J.Soc.Mater.Eng.Resorces。

上田 みどり: "バルーン状スピネルフェライトの作製と表面組織の制御" 日本素材物性学会誌. 7. 46-51 (1994)

Midori Ueda：“气球状尖晶石铁氧体的制备和表面结构的控制”日本材料物理学会杂志7. 46-51（1994）。