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

(CN4H7)2·Zn3(HPO3)4, a three-dimensional framework zincophosphite: an example of template–template co-operation? (CN4H7)2·Zn3(HPO3)4，三维框架锌磷酸酯:模板-模板合作的一个例子?

International Journal of Inorganic Materials Pub Date : 2001-11-01 Epub Date: 2001-11-19 DOI: 10.1016/S1466-6049(01)00076-9

William T.A Harrison , Mark L.F Phillips , Tina M Nenoff

{"title":"(CN4H7)2·Zn3(HPO3)4, a three-dimensional framework zincophosphite: an example of template–template co-operation?","authors":"William T.A Harrison , Mark L.F Phillips , Tina M Nenoff","doi":"10.1016/S1466-6049(01)00076-9","DOIUrl":"10.1016/S1466-6049(01)00076-9","url":null,"abstract":"<div>The hydrothermal synthesis and single crystal structure of (CN4H7)2·Zn3(HPO3)4 are reported. This phase is built up from a network of vertex-linked ZnO4 and HPO3 building units encapsulating the extra-framework animoguanidinium cations. A new type of three-dimensional network for the inorganic component of the structure arises, which contains polyhedral 4-, 6-, 8-, 12- and 16-rings. There are close (∼3.6 Å), side-on, template–template contacts similar to those seen between pairs of guanidinium cations in molecular compounds. Crystal data: (CN4H7)2·Zn3(HPO3)4, Mr=666.30, monoclinic, space group P21/n (No. 14), a=10.2589 (4) Å, b=29.5851 (12) Å, c=13.7578 (5) Å, β=103.303 (1)°, V=4063.6 (5) Å3, Z=8, T=298 (2) K, R(F)=0.0399, wR(F2)=0.0792.</div>","PeriodicalId":100700,"journal":{"name":"International Journal of Inorganic Materials","volume":"3 7","pages":"Pages 1033-1038"},"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)00076-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75180340","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: 42

Synthesis and crystal structure of three MM′B9O15 borates (M=Ba, Sr and M′=Li; M=Ba and M′=Na) 三种MM ' b9o15硼酸盐(M=Ba, Sr和M ' =Li)的合成及晶体结构M=Ba, M ' =Na)

International Journal of Inorganic Materials Pub Date : 2001-11-01 Epub Date: 2001-11-19 DOI: 10.1016/S1466-6049(01)00078-2

N Penin , L Seguin , M Touboul , G Nowogrocki

{"title":"Synthesis and crystal structure of three MM′B9O15 borates (M=Ba, Sr and M′=Li; M=Ba and M′=Na)","authors":"N Penin , L Seguin , M Touboul , G Nowogrocki","doi":"10.1016/S1466-6049(01)00078-2","DOIUrl":"10.1016/S1466-6049(01)00078-2","url":null,"abstract":"<div>The compounds BaLiB9O15 (BaLi), BaNaB9O15 (BaNa) and SrLiB9O15 (SrLi) have been synthesised, and their structure determined by single crystal X-ray diffraction methods. Each borate crystallises with six formula units in the R3c non-centrosymmetric space group. Cell parameters are: a=11.0223(19) Å, c=17.106(4) Å, and V=1799.8(6) Å3 for the (BaLi) compound; a=11.0933(15) Å, c=17.392(3) Å, and V=1853.5(5) Å3 for the (BaNa) compound; a=10.6129(9) Å, c=17.555(2) Å, and V=1712.4(3) Å3 for (SrLi) compound. The borate anion is characterised by a three-dimensional framework built up from [B3O7] rings; its shorthand notation is 3: ∞3 (2△+T), where △ is a BO3 triangle and T is a BO4 tetrahedron. In these three compounds, the alkaline earth (Ba, Sr) and the alkaline (Li, Na) ions occupy alternate sites in the channels along the c axis; however, their oxygenated environment is different. In (BaNa) and (SrLi), the [BaO9] and [SrO9] form tricapped trigonal prisms and [NaO6] and [LiO6] trigonal antiprisms whereas in (BaLi), [BaO12] forms an irregular icosahedron and there are only three oxygen atoms in the neighboring of lithium ion.</div>","PeriodicalId":100700,"journal":{"name":"International Journal of Inorganic Materials","volume":"3 7","pages":"Pages 1015-1023"},"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)00078-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75063323","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: 58

Kinetics of solid state reaction between zirconium and copper(I) chloride 锆与氯化铜(I)固相反应动力学

International Journal of Inorganic Materials Pub Date : 2001-11-01 Epub Date: 2001-11-19 DOI: 10.1016/S1466-6049(01)00179-9

B. Gillot , H. Souha , M. Radid

引用次数: 2

Thermal solid–solid interaction and physicochemical properties of CuO–Fe2O3 system CuO-Fe2O3体系固固热相互作用及理化性质研究

International Journal of Inorganic Materials Pub Date : 2001-11-01 Epub Date: 2001-11-19 DOI: 10.1016/S1466-6049(01)00165-9

W.M. Shaheen , A.A. Ali

{"title":"Thermal solid–solid interaction and physicochemical properties of CuO–Fe2O3 system","authors":"W.M. Shaheen , A.A. Ali","doi":"10.1016/S1466-6049(01)00165-9","DOIUrl":"10.1016/S1466-6049(01)00165-9","url":null,"abstract":"<div>A series of single and mixed oxides of CuO–Fe2O3 was prepared by thermal treatment of pure and mixed copper and ferric nitrate solids at 350–1000°C. The thermal behaviour of the single and binary salts has been studied using the thermal analysis (TG-DTG) technique. The thermal products were characterised using the X-ray diffraction analysis. The results revealed that copper and ferric nitrates decomposed to CuO and Fe2O3 at about 400°C, respectively, in the Cu–Fe mixtures. The presence of ferric oxide in the mixture prevents the reduction process of CuO to Cu2O. Crystalline copper ferrite phase was detected at 750 and 1000°C as a result of solid–solid interaction between CuO and Fe2O3. The presence of excess of CuO in the mixture stimulates the formation of well crystalline copper ferrite phase while excess of Fe2O3 hinders the previous process. The catalytic activity of the obtained pure and mixed oxides was measured using the decomposition of hydrogen peroxide at 30–50°C. It was found that the mixed oxide solids have catalytic activity higher than single oxides preheated at 350 and 550°C. The rise in precalcination temperature to 750 and 1000°C brought about a drastic decrease in the activity of mixed solids because of formation of copper ferrite phase and/or sintering process.</div>","PeriodicalId":100700,"journal":{"name":"International Journal of Inorganic Materials","volume":"3 7","pages":"Pages 1073-1081"},"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)00165-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73079427","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: 34

Synthesis, characterization and thermodynamics of the reaction of calcium methylphosphonate with n-alkylmonoamines 甲基膦酸钙与正烷基单胺反应的合成、表征及热力学研究

International Journal of Inorganic Materials Pub Date : 2001-11-01 Epub Date: 2001-11-19 DOI: 10.1016/S1466-6049(01)00089-7

Cicero B.A Lima, Claudio Airoldi

{"title":"Synthesis, characterization and thermodynamics of the reaction of calcium methylphosphonate with n-alkylmonoamines","authors":"Cicero B.A Lima, Claudio Airoldi","doi":"10.1016/S1466-6049(01)00089-7","DOIUrl":"10.1016/S1466-6049(01)00089-7","url":null,"abstract":"<div>Lamellar crystalline calcium methylphosphonate, Ca[(HO)O2PCH3]2.H2O reacted with a series of n-monoalkylamines to yield the compounds Ca[(HO)O2PCH3]2·xH2N(CH2)nCH3·(1−x)H2O (n=0–4). Intense bands of the phosphonate group in the 1095–995 cm−1 region in the infrared spectrum were detected. X-ray diffraction patterns showed a sharp and intense peak with an interlamellar distance of 907 pm. 31P NMR spectrum gave a peak at 27.38 ppm for phosphonate groups. On heating methylphosphonate water molecules, organic moiety and P2O5 were released to yield a residue of pyrophosphate. The aminated compound presented the same sequence of mass loss, with amine being lost in the first stage. 3C NMR spectrum presented peaks at 15 and 17 ppm for methylphosphonate groups. The original crystallinity of the compound is disturbed by the reaction with the n-alkylmonoamine, giving constant interlamellar distance. The energetic effect caused by amine was determined through reaction-solution calorimetry in the solid–liquid interface from aqueous solution. The thermodynamic data showed that the system is favored by enthalpy, Gibbs free energy, and entropy values.</div>","PeriodicalId":100700,"journal":{"name":"International Journal of Inorganic Materials","volume":"3 7","pages":"Pages 907-914"},"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)00089-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88078366","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: 21

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 Epub Date: 2001-11-19 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

Homogeneous precipitation and thermal phase transformation of mullite ceramic precursor 莫来石陶瓷前驱体的均匀析出与热相变

International Journal of Inorganic Materials Pub Date : 2001-11-01 Epub Date: 2001-11-19 DOI: 10.1016/S1466-6049(01)00166-0

Sugita Satoshi, César Contreras , Héctor Juárez , Alberto Aguilera , Juan Serrato

{"title":"Homogeneous precipitation and thermal phase transformation of mullite ceramic precursor","authors":"Sugita Satoshi, César Contreras , Héctor Juárez , Alberto Aguilera , Juan Serrato","doi":"10.1016/S1466-6049(01)00166-0","DOIUrl":"10.1016/S1466-6049(01)00166-0","url":null,"abstract":"<div>A fine pure mullite powder was prepared by homogeneous precipitation, mixing a fumed silica suspension in water and aqueous solutions of ammonium bisulphite and aluminium sulphate. This method produced a nanocomposite like structure, consisting of a fumed silica core coated with a thin layer of basic aluminium sulphate. The thermal transformation sequence of this mullite precursor was studied in this work in detail by means of scanning electron microscopy, X-ray powder diffraction technique, BET, thermal analysis (DTA and TG), and infrared spectroscopy, dilatometry and particle size distribution analysis. This nanocomposite lost water accompanied by a shrinkage at temperatures lower than 400°C. The sulphate ion elimination occurred at a temperature range of 500–850°C. Although most of the sulphate ion was eliminated, the powder was still amorphous at 800°C. The γ-Al2O3 was formed at 850°C increasing the particle size by the pyroexpansion process (eliminating sulphur trioxide gas). A spinel phase and traces of crystalline mullite were formed at 950°C. A fine mullite whisker was observed in the samples calcined at 1000–1100°C. A total transformation to mullite required temperatures higher than 1250°C. Grain growth occurred at these temperatures at the same time.</div>","PeriodicalId":100700,"journal":{"name":"International Journal of Inorganic Materials","volume":"3 7","pages":"Pages 625-632"},"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)00166-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83544302","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: 24

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 Epub Date: 2001-11-19 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

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 Epub Date: 2001-11-19 DOI: 10.1016/S1466-6049(01)00183-0

Peter Majewski, Jochen Rager, Cornelia Schurr, Fritz Aldinger

引用次数: 4

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 Epub Date: 2001-11-19 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