Studies on nano-hybridization of layred ceramics

层状陶瓷的纳米杂化研究

• 批准号: 04453072
• 负责人: KIKKAWA Shinichi
• 金额: $ 4.61万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04453072/
• 关键词: nano-composite; layred compound; high temperature superconductor; misfit compound; double nitride; rf-sputter; thin film; magnetism of fine powder; ミスフィット化合物; 非整合性; 積層化合物; 超伝導体; 金属ー半導体転移; 積層膜

Inorganic hybridized composites in nano-scale are attracting attention to find out new functional materials. In the present study, the following interactions in nano-composite materials were investigated focusing on hybridized layred materials.(1) Oxide superconductors have layred structure where CuO_2 conduction layrs are interleaved with modified layr. The latter injects hole or electron as superconducting carrier to the former. Electron-doped superconductors (Ln, Ce)_2CuO_y with Ln=Pr, Nd, Sm Eu were prepared. Tc maximum was observed on Ln=Nd where copper was most effectively reduced in spite of the largest oxygen content among the (Ln, Ce)_2CuO_y. Tensile stress between the conduction and the modified layrs determines which layr is reduced. We could also find out very large critical current on our high pressure synthesized infinite layred superconductor Sr_<1-X>La_XCuO_2 probably because of the strong CuO_2 interlayr interaction due to the very short interlayr distance.(2) A series of misfit layred compounds LnMS_3 were prepared. Metallic conduction in VS_2 was reduced to semiconductive because of the large misfit between VS_2 and LnS layrs in LnVS_3. The metallic nature was recovered in low temperature where the both layrs became commensurate. Several kinds of new double metal nitrides such as SrNiN, Ca_3CoN_3 and so on were also found out in the reactions between alkaline-earth metal nitrides and transition metal nitrides.(3) Amorphous Si-Fe-N thin films were prepared by rf-sputter deposition. Fine grain particles with various particle size were crystallized in the film by changing their heat treatment temperature. Maximum coercive force was observed when the particle size was 30-50nm. The product was superparamagnetic in case of the particle size below 30nm.

纳米级的无机杂化复合材料正在引起人们的关注，以寻找新的功能材料。本文以杂化层状材料为研究对象，研究了纳米复合材料中的以下相互作用：(1)氧化物超导体具有层状结构，其中CuO_2导电层与改性层交织在一起。后者将空穴或电子作为超导载流子注入前者。制备了Ln=Pr，Nd，Sm，Eu的电子掺杂超导体(Ln，Ce)2CuOy。在(Ln，Ce)_2CuO_y中，虽然氧含量最高，但在Ln=ND时，铜的还原效果最好。导电层和改性层之间的拉应力决定了哪一层被还原。我们还可以在高压合成的无限大层状超导体上发现很大的临界电流，这可能是由于CuO_2层间相互作用很强，层间距离很短。(2)制备了一系列失配层状化合物LnMS_3。由于VS_2和LnVS_3中的LNS层之间存在较大的失配，VS_2中的金属导电被还原为半导性。在低温下，两者变得相称，恢复了金属的性质。在碱土金属氮化物与过渡金属氮化物的反应中还发现了几种新的双金属氮化物，如SrNiN、Ca3CoN3等。(3)采用射频溅射沉积法制备了非晶态Si-Fe-N薄膜。通过改变热处理温度，使不同粒径的细小颗粒在薄膜中结晶。当颗粒尺寸为30~50 nm时，样品的矫顽力最大。当颗粒尺寸小于30 nm时，产物为超顺磁性。

项目成果

S.Kikkawa et al.: "Metal Nitride Composites in Nano-scale as Functional Ceramics" Mem.Inst. Sci.Ind.Res., Osaka Univ.49. 3-5 (1992)

S.Kikkawa 等人：“纳米级金属氮化物复合材料作为功能陶瓷”Mem.Inst。

T.Yamamoto et al.: "Preparation of New Ternary Nitrides CaMN (M=Co, Ni)" Solid State Ionics. 63-65. 148-153 (1993)

T.Yamamoto 等人：“新型三元氮化物 CaMN (M=Co, Ni) 的制备”固态离子学。

N.Cho ら: "Crystal Structural,Electric and Magnetic Studies on the Misfit Lager Compounds“LnMS_3"(Ln=rare earth)" Solid State Ionics. 63-65. 696-701 (1993)

N.Cho 等人：“Misfit Lager 化合物“LnMS_3”（Ln=稀土）的晶体结构、电学和磁学研究”固态离子学 63-65 (1993)。

T.Yamamoto,S.Kikkawa and F.Kanamaru: "Preparation of New Ternary Nitrides CaMN(M=Co,Ni)" Solid State Ionics.

T.Yamamoto、S.Kikkawa 和 F.Kanamaru：“新型三元氮化物 CaMN(M=Co,Ni) 的制备”固态离子学。

S.Kikkawa ら: "High Pressure Synthesis and Superconductivity of Infinite Layered Sr_<1-X>LaxCuO_2" Applied Superconductivity. 1. 487-491 (1993)

S. Kikkawa 等人：“无限层状 Sr_<1-X>LaxCuO_2 的高压合成和超导”，《应用超导》1. 487-491 (1993)。