International Journal of Inorganic Materials最新文献_第10页

Clustering of Fe3+ in the Li1−3xFexMgPO4 (0 Fe3+在Li1−3xFexMgPO4 (0<x<0.1)固溶体中的聚类

International Journal of Inorganic Materials Pub Date : 2001-11-01 DOI: 10.1016/S1466-6049(01)00083-6

Aintzane Goñi , Luis Lezama , Ainhoa Pujana , Marı́a Isabel Arriortua , Teófilo Rojo

{"title":"Clustering of Fe3+ in the Li1−3xFexMgPO4 (0<x<0.1) solid solution","authors":"Aintzane Goñi , Luis Lezama , Ainhoa Pujana , Marı́a Isabel Arriortua , Teófilo Rojo","doi":"10.1016/S1466-6049(01)00083-6","DOIUrl":"10.1016/S1466-6049(01)00083-6","url":null,"abstract":"<div>The Li1−3xFexMgPO4 (0<x<0.1) solid solution has been prepared by solid state synthesis. The structure of these phases has been determined by X-ray diffraction on polycrystalline samples, being isostructural with LiMgPO4. Fe3+ substitutes part of the Li+ ions in the channels of the LiMgPO4 structure along the [010] direction, creating cation vacancies. The IR bands corresponding to the vibrational modes of the phosphate groups undergo a gradual widening with the amount of inserted iron as a consequence of the increase of disorder in the structure. The EPR spectra show signals with an effective g′=4.0. This fact can be attributed to the presence of high spin Fe3+ ions in orthorhombic symmetry. The increase of Fe3+ in the compounds leads to a broadening of the Lorentzian EPR signals indicating the existence of magnetic interactions between the Fe3+ ions. Magnetic susceptibility measurements on the Li1−3xFexMgPO4 (0<x<0.1) solid solution show antiferromagnetic behaviors which can be explained considering that the doped Fe3+ ions exhibit a short range magnetic order, forming clusters associated with the vacancies in the structure.</div>","PeriodicalId":100700,"journal":{"name":"International Journal of Inorganic Materials","volume":"3 7","pages":"Pages 937-942"},"PeriodicalIF":0.0,"publicationDate":"2001-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1466-6049(01)00083-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76151081","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 18

Luminescence of Eu(III) β-diketone complex supported on functionalized macroporous silica matrix 功能化大孔二氧化硅基质上铕(III) β-二酮配合物的发光特性

International Journal of Inorganic Materials Pub Date : 2001-11-01 DOI: 10.1016/S1466-6049(01)00053-8

F.A Sigoli , H.F Brito , M Jafelicci Jr , M.R Davolos

引用次数: 27

Infrared studies of some mixed Li–Co ferrites 一些混合锂钴铁氧体的红外研究

International Journal of Inorganic Materials Pub Date : 2001-11-01 DOI: 10.1016/S1466-6049(01)00174-X

S.C Watawe , B.D Sutar , B.D Sarwade , B.K Chougule

引用次数: 79

Simplified chemical route for the synthesis of barium titanyl oxalate (BTO) 简化合成草酸钛钡(BTO)的化学路线

International Journal of Inorganic Materials Pub Date : 2001-11-01 DOI: 10.1016/S1466-6049(01)00168-4

H.S. Potdar, S.B. Deshpande, A.S. Deshpande, Y.B. Khollam, A.J. Patil, S.D. Pradhan, S.K. Date

{"title":"Simplified chemical route for the synthesis of barium titanyl oxalate (BTO)","authors":"H.S. Potdar, S.B. Deshpande, A.S. Deshpande, Y.B. Khollam, A.J. Patil, S.D. Pradhan, S.K. Date","doi":"10.1016/S1466-6049(01)00168-4","DOIUrl":"10.1016/S1466-6049(01)00168-4","url":null,"abstract":"<div>A simple chemical route is developed to obtain an important molecular precursor (leading to barium titanate powders), namely barium titanyl oxalate (BTO) with nearly theoretical yield. In this route, 0.1 M alcoholic solution of titanium tetrabutoxide is reacted with 0.1 M alcoholic solution of oxalic acid to form titanyl oxalate (TiOC2O4). This was further converted to soluble ammonium titanyl oxalate (ATO); (NH4)2TiO(C2O4)2.H2O by reacting with an equimolar aqueous solution of ammonium oxalate (pH 4.25). Instead of using available barium salts (halide/nitrate/acetate) solution, a modified barium precursor solution with controlled pH (=4.2) is prepared for carrying out cation-exchange reaction with ATO. For this purpose the modified Ba-precursor solution is freshly prepared by partial neutralization of a 0.1 M aqueous solution of barium hydroxide with controlled addition of dilute HNO3 (1.1 M) solution. The pH of this solution is the same as that of the ATO solution. The exchange reaction between equimolar ATO and modified Ba-precursor solution precipitated barium titanyl oxalate (BTO) with a quantitative yield at room temperature. Submicron-sized, stoichiometric, pure BaTiO3 powders were obtained by the controlled pyrolysis of BTO in air. The present communication deals with the detailed analysis of this simplified method in producing BTO/BT powders and their characterization employing various physicochemical techniques.</div>","PeriodicalId":100700,"journal":{"name":"International Journal of Inorganic Materials","volume":"3 7","pages":"Pages 613-623"},"PeriodicalIF":0.0,"publicationDate":"2001-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1466-6049(01)00168-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78386630","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 26

Piezoelectric and dielectric properties of transparent Pb(Ni1/3Nb2/3)1−x−yZrxTiyO3 ceramics prepared by hot isostatic pressing 热等静压法制备Pb(Ni1/3Nb2/3)1−x−yZrxTiyO3透明陶瓷的压电和介电性能

International Journal of Inorganic Materials Pub Date : 2001-11-01 DOI: 10.1016/S1466-6049(01)00200-8

Edward F Alberta, Amar S Bhalla

引用次数: 31

Phase relations and homogeneity region of Sr(Fe,Mo)O3 at 1200°C in air 1200℃空气中Sr(Fe,Mo)O3的相关系和均匀区

International Journal of Inorganic Materials Pub Date : 2001-11-01 DOI: 10.1016/S1466-6049(01)00183-0

Peter Majewski, Jochen Rager, Cornelia Schurr, Fritz Aldinger

引用次数: 4

Degenerate semiconductors in the light of electronegativity and chemical hardness 简并半导体的电负性和化学硬度

International Journal of Inorganic Materials Pub Date : 2001-11-01 DOI: 10.1016/S1466-6049(01)00074-5

Josik Portier , Guy Campet , Armel Poquet , Corinne Marcel , M.A Subramanian

引用次数: 21

Direct synthesis of zeolite Y with large particle size 大粒径Y型沸石的直接合成

International Journal of Inorganic Materials Pub Date : 2001-11-01 DOI: 10.1016/S1466-6049(01)00046-0

Samia Ferchiche, Juliusz Warzywoda, Albert Sacco Jr.

引用次数: 46

Synthesis and characterization of a Si–Ti–Zr oxide nanocomposite of hexagonal structure 六方结构Si-Ti-Zr氧化物纳米复合材料的合成与表征

International Journal of Inorganic Materials Pub Date : 2001-11-01 DOI: 10.1016/S1466-6049(01)00173-8

Robson Fernandes de Farias

引用次数: 3

Transport properties and ac susceptibility of (Bi1.6Pb0.4)Sr2Ca2Cu1−xCox)3Oy superconductors (Bi1.6Pb0.4)Sr2Ca2Cu1−xCox)3Oy超导体的输运性质和交流磁化率

International Journal of Inorganic Materials Pub Date : 2001-11-01 DOI: 10.1016/S1466-6049(01)00049-6

G Ilonca , A.V Pop , Tzuen-Rong Yang , T Jurcut , C Lung , G Stiufiuc , R Stiufiuc , I.A Panfilescu

引用次数: 8