International Journal of Inorganic Materials最新文献_第9页

Metal–insulator transition in the spinel-type Cu(Ir1−xPtx)2S4 system 尖晶石型Cu(Ir1−xPtx)2S4体系中的金属-绝缘体转变

International Journal of Inorganic Materials Pub Date : 2001-11-01 Epub Date: 2001-11-19 DOI: 10.1016/S1466-6049(01)00180-5

Nobuhiro Matsumoto, Yasuhiro Yamauchi, Junji Awaka, Yasushi Kamei, Hideaki Takano, Shoichi Nagata

引用次数: 8

Ternary lithium nitridocuprates, Li3−x−yCuxN: crystal growth, bulk synthesis, structure and magnetic properties 三元氮化锂，Li3−x−yCuxN:晶体生长、体合成、结构和磁性能

International Journal of Inorganic Materials Pub Date : 2001-11-01 Epub Date: 2001-11-19 DOI: 10.1016/S1466-6049(01)00081-2

Alexandra G. Gordon , Duncan H. Gregory , Alexander J. Blake , David P. Weston , Martin O. Jones

{"title":"Ternary lithium nitridocuprates, Li3−x−yCuxN: crystal growth, bulk synthesis, structure and magnetic properties","authors":"Alexandra G. Gordon , Duncan H. Gregory , Alexander J. Blake , David P. Weston , Martin O. Jones","doi":"10.1016/S1466-6049(01)00081-2","DOIUrl":"10.1016/S1466-6049(01)00081-2","url":null,"abstract":"<div>Systematic studies within the ternary Li–Cu–N system have examined the effects of varying starting materials, transition metal stoichiometry, reaction temperature/duration and cooling rate on crystal growth and bulk phase formation of ternary nitridocuprates. Resulting lithium transition metal compounds, Li3−x−y□yCuxN (□=Li vacancy), have been characterised by single crystal and powder XRD. The maximum copper substituent level (x≈0.45) and vacancy level, y, appear insensitive to reaction temperature. Both vacancies and copper are disordered with Li when reaction mixtures are quenched (α-Li3N-type: P6/mmm, a≈3.7 Å, c≈3.8 Å, Z=1), whereas evidence of copper and/or vacancy ordering exists on slow cooling. Morphology of crystallites has been evaluated by SEM and magnetic properties have been investigated using squid magnetometry. Magnetic data show compounds exhibit temperature dependent paramagnetism in contrast to the parent nitride, Li3N.</div>","PeriodicalId":100700,"journal":{"name":"International Journal of Inorganic Materials","volume":"3 7","pages":"Pages 973-981"},"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)00081-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90996735","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: 17

Influence of tile synthesis parameters on the structural and textural properties of precipitated manganese oxides 瓦片合成参数对沉淀锰氧化物结构和织构性能的影响

International Journal of Inorganic Materials Pub Date : 2001-11-01 Epub Date: 2001-11-19 DOI: 10.1016/S1466-6049(01)00091-5

J. Boyero Macstre , E. Fernández López , J.M. Gallardo-Amores , R. Ruano Casero , V. Sánchez Escribano , E. Pérez Bernal

引用次数: 56

Polyacrylamide gel: an efficient tool for easy synthesis of multicomponent oxide precursors of ceramics and glasses 聚丙烯酰胺凝胶:一种易于合成陶瓷和玻璃多组分氧化物前驱体的有效工具

International Journal of Inorganic Materials Pub Date : 2001-11-01 Epub Date: 2001-11-19 DOI: 10.1016/S1466-6049(01)00188-X

André Douy

{"title":"Polyacrylamide gel: an efficient tool for easy synthesis of multicomponent oxide precursors of ceramics and glasses","authors":"André Douy","doi":"10.1016/S1466-6049(01)00188-X","DOIUrl":"10.1016/S1466-6049(01)00188-X","url":null,"abstract":"<div>The combination of citrate complexation in aqueous chemistry with the steric entrapment effect of an auxiliary organic gel affords the possibility of easy and rapid synthesis of high quality multicomponent oxide powders. Stable solutions of strongly chelated cations are obtained by controlling the amount of ligand and the pH. These solutions are then easily gelled by in situ formation of polyacrylamide gel. This hydrous gel is directly decomposed by thermal treatment, resulting in fine and nanoscale powders. The polyacrylamide gel makes the citrate process easier and more rapid. The chemical homogeneity of the powders, usually high for the citrate process, may be improved by the steric effect of the organic gel. The process, routinely used for hundreds of preparations is illustrated by the synthesis of four compounds as examples. Nearly single-phase calcium hexaaluminate CaAl12O19 is obtained after heat treatment at 1100°C for 1 h. Pure lanthanum manganite La0.8Sr0.2MnO3 and barium zirconate BaZrO3 are formed at 650 and 1000°C, respectively. The synthesis of anorthite CaAl2Si2O8 is an example of the use of this process for silicates or aluminosilicates in aqueous chemistry without citrate chelation. The amorphous precursor crystallises at 1000°C into hexagonal anorthite before transforming into the stable triclinic form. The steric entrapment effect of the polyacrylamide gel is advantageous for aqueous chemical processes, and in the same way, the same concept may be used for other organic gels in organic media.</div>","PeriodicalId":100700,"journal":{"name":"International Journal of Inorganic Materials","volume":"3 7","pages":"Pages 699-707"},"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)00188-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84531205","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: 87

Electrical behaviour of the system La1.33NaxMnxTi2−xO6 (x=0.66, 0.55 and 0.44) La1.33NaxMnxTi2−xO6体系(x=0.66, 0.55和0.44)的电学行为

International Journal of Inorganic Materials Pub Date : 2001-11-01 Epub Date: 2001-11-19 DOI: 10.1016/S1466-6049(01)00195-7

A.I Ruiz , M.L López , C Pico , M.L Veiga , T.A Ezquerra

引用次数: 2

Luminescent properties and lattice defects correlation on zinc oxide 氧化锌的发光特性与晶格缺陷的关系

International Journal of Inorganic Materials Pub Date : 2001-11-01 Epub Date: 2001-11-19 DOI: 10.1016/S1466-6049(01)00055-1

S.A.M Lima, F.A Sigoli, M Jafelicci Jr, M.R Davolos

{"title":"Luminescent properties and lattice defects correlation on zinc oxide","authors":"S.A.M Lima, F.A Sigoli, M Jafelicci Jr, M.R Davolos","doi":"10.1016/S1466-6049(01)00055-1","DOIUrl":"10.1016/S1466-6049(01)00055-1","url":null,"abstract":"<div>The ZnO luminescent properties are strongly influenced by the preparation method and they are principally related to electronic and crystalline structures. This work reports about the correlation among luminescence properties of ZnO, obtained from zinc hydroxycarbonate, and crystalline lattice defects, microstrain, as function of thermal treatment. The crystallite size increase and the qualitative microstrain, obtained by Williamson–Hall plots, decrease as function of temperature. The evolution of electronic defects is analyzed by luminescence spectroscopy based on energy of the electronic transitions. From excitation spectrum, it is verified two bands around 377 nm and 405 nm attributed to the transitions between valence–conduction bands and valence band to interstitial zinc level, respectively. The emission spectra of sample treated at 600°C shows large band at 670 nm. However, the green emission around 530 nm is observed for samples treated at 900°C. The intensities of excitation and emission bands are associated with the increase of the electronic defects that depend on the strain lattice decrease. The lowest strain lattice results on the best green luminescent properties of zinc oxide.</div>","PeriodicalId":100700,"journal":{"name":"International Journal of Inorganic Materials","volume":"3 7","pages":"Pages 749-754"},"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)00055-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86098751","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: 220

Transport properties of Bi2Sr2Ca1−xGdx(Cu1−yZny)2Oy epitaxial thin films Bi2Sr2Ca1−xGdx(Cu1−yZny)2Oy外延薄膜的输运特性

International Journal of Inorganic Materials Pub Date : 2001-11-01 Epub Date: 2001-11-19 DOI: 10.1016/S1466-6049(01)00045-9

Tzuen-Rong Yang , G. Ilonca , Mi-Ra Kim , G. Stiufiuc , C. Lung

引用次数: 1

Characterisation of stoichiometric sol–gel mullite by fourier transform infrared spectroscopy 化学计量溶胶-凝胶莫来石的傅里叶变换红外光谱表征

International Journal of Inorganic Materials Pub Date : 2001-11-01 Epub Date: 2001-11-19 DOI: 10.1016/S1466-6049(01)00189-1

P Padmaja, G.M Anilkumar, P Mukundan, G Aruldhas, K.G.K Warrier

{"title":"Characterisation of stoichiometric sol–gel mullite by fourier transform infrared spectroscopy","authors":"P Padmaja, G.M Anilkumar, P Mukundan, G Aruldhas, K.G.K Warrier","doi":"10.1016/S1466-6049(01)00189-1","DOIUrl":"10.1016/S1466-6049(01)00189-1","url":null,"abstract":"<div>Fourier Transform Infrared Spectroscopic investigation has been carried out to study the structural changes and coordination of Al and Si in the mullite system as a function of temperature (60–1400°C). The FTIR spectral patterns of the gel and the gel calcined at 200°C show bands corresponding to Al–O–Al and Si–O–Si vibrations. At higher temperatures hydroxyl groups and organics present have been removed. The absence of fine structure in the region 400–900 cm−1 in the temperature range 400–1000°C is interpreted as due to the existence of nanostructured alumina, silica and alumina–silica agglomeration in the amorphous state. Analysis of the spectra indicates the presence of both octahedral and tetrahedral coordination at 1000°C, the temperature around which spinel is formed. The shifting of the asymmetric stretching frequencies of the Si–O–Si and Al–O–Si networks to higher wave numbers indicate the formation of mullite at 1200°C. Crystalline nature of the product is indicated by the sharpening of spectral peaks. The spectra also indicates the completion of mullite formation at 1250°C.</div>","PeriodicalId":100700,"journal":{"name":"International Journal of Inorganic Materials","volume":"3 7","pages":"Pages 693-698"},"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)00189-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74285733","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: 150

Lithium loss from lithium cobalt oxide: hexagonal Li0.5Co0.5O to cubic Li0.065Co0.935O phase transition 氧化钴锂的锂损失:六方Li0.5Co0.5O向立方Li0.065Co0.935O相变

International Journal of Inorganic Materials Pub Date : 2001-11-01 Epub Date: 2001-11-19 DOI: 10.1016/S1466-6049(01)00185-4

Ermete Antolini

{"title":"Lithium loss from lithium cobalt oxide: hexagonal Li0.5Co0.5O to cubic Li0.065Co0.935O phase transition","authors":"Ermete Antolini","doi":"10.1016/S1466-6049(01)00185-4","DOIUrl":"10.1016/S1466-6049(01)00185-4","url":null,"abstract":"<div>Lithium loss from LiCoO2 following isochronal thermal treatment for 5 h in the temperature range 850–1300°C was determined by thermogravimetric (TGA) and diffractometric (XRD) measurements. Lithium vaporization starts from 900°C, and following thermal treatment at 1300°C 85% of lithium was lost. At 1050°C a change in the mechanism of lithium and oxygen evaporation was observed. Initially, following lithium loss, LiyCo2−yO2 (solid solution of CoO in LiCoO2) was formed. An activation energy of 305 kJ mol−1, not too far from the heat of reaction from Li2O to Li2O2 vapour, was obtained. Phase transition to cubic Li0.065Co0.935O structure occurred starting from thermal treatment at 1050°C. Both hexagonal and cubic lithium cobalt oxide structures were subjected to phase transition to get LiCoO2 and Co3O4 during cooling, but the cubic phase was stabilized against phase transition with increasing temperature.</div>","PeriodicalId":100700,"journal":{"name":"International Journal of Inorganic Materials","volume":"3 7","pages":"Pages 721-726"},"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)00185-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89320690","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: 14

Study of (Sr, Pb)TiO3 ceramics on dielectric and physical properties (Sr, Pb)TiO3陶瓷介电性能和物理性能的研究

International Journal of Inorganic Materials Pub Date : 2001-11-01 Epub Date: 2001-11-19 DOI: 10.1016/S1466-6049(01)00187-8

Yoshitaka Somiya, Amar S Bhalla, L.Eric Cross

引用次数: 120