Pub Date : 1991-09-20DOI: 10.1016/0022-5088(91)90351-4
F. Padella, E. Paradiso, N. Burgio, M. Magini, S. Martelli, W. Guo, A. Iasonna
The conditions of milling are of crucial importance in determining the kind of solid state reaction that can take place, among various possible paths, in a given system submitted to the mechanical alloying (MA) process. A model correlating the energy transfer during milling with the experimental parameters (rotation speed, mass and diameter of the balls) has been verified with the Pd-Si system. The composition Pd80Si20 has been milled, starting from pure elemental powders, in different milling conditions and the MA process followed by X-ray and differential scanning calorimetry measurements. It has been found that for high levels of energy transfer the system evolves towards the formation of the intermetallic Pd3Si. At lower levels of energy transfer, formation of a stable intermetallic phase is hindered and the reaction product is a fully amorphous phase. The amorphous structure of the MA sample has been compared with an amorphous melt-spun ribbon of the same composition.
{"title":"Mechanical alloying of the Pd-Si system in controlled conditions of energy transfer","authors":"F. Padella, E. Paradiso, N. Burgio, M. Magini, S. Martelli, W. Guo, A. Iasonna","doi":"10.1016/0022-5088(91)90351-4","DOIUrl":"https://doi.org/10.1016/0022-5088(91)90351-4","url":null,"abstract":"<div><p>The conditions of milling are of crucial importance in determining the kind of solid state reaction that can take place, among various possible paths, in a given system submitted to the mechanical alloying (MA) process. A model correlating the energy transfer during milling with the experimental parameters (rotation speed, mass and diameter of the balls) has been verified with the Pd-Si system. The composition Pd<sub>80</sub>Si<sub>20</sub> has been milled, starting from pure elemental powders, in different milling conditions and the MA process followed by X-ray and differential scanning calorimetry measurements. It has been found that for high levels of energy transfer the system evolves towards the formation of the intermetallic Pd<sub>3</sub>Si. At lower levels of energy transfer, formation of a stable intermetallic phase is hindered and the reaction product is a fully amorphous phase. The amorphous structure of the MA sample has been compared with an amorphous melt-spun ribbon of the same composition.</p></div>","PeriodicalId":17534,"journal":{"name":"Journal of The Less Common Metals","volume":"175 1","pages":"Pages 79-90"},"PeriodicalIF":0.0,"publicationDate":"1991-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0022-5088(91)90351-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71731615","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}
Pub Date : 1991-09-20DOI: 10.1016/0022-5088(91)90359-C
B.Chafik El Idrissi, G. Venturini, B. Malaman, D. Fruchart
{"title":"Magnetic structures of TbMn6Sn6 and HoMn6Sn6 compounds from neutron diffraction study","authors":"B.Chafik El Idrissi, G. Venturini, B. Malaman, D. Fruchart","doi":"10.1016/0022-5088(91)90359-C","DOIUrl":"https://doi.org/10.1016/0022-5088(91)90359-C","url":null,"abstract":"","PeriodicalId":17534,"journal":{"name":"Journal of The Less Common Metals","volume":"8 1","pages":"143-154"},"PeriodicalIF":0.0,"publicationDate":"1991-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79200844","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}
Pub Date : 1991-09-20DOI: 10.1016/0022-5088(91)90346-6
P. Kritsalis, L. Coudurier, C. Parayre, N. Eustathopoulos
{"title":"Influence of adsorption and interfacial reactions induced by chromium and titanium on the wettability of vitreous carbon by NiPd brazing alloys","authors":"P. Kritsalis, L. Coudurier, C. Parayre, N. Eustathopoulos","doi":"10.1016/0022-5088(91)90346-6","DOIUrl":"https://doi.org/10.1016/0022-5088(91)90346-6","url":null,"abstract":"","PeriodicalId":17534,"journal":{"name":"Journal of The Less Common Metals","volume":"62 1","pages":"13-27"},"PeriodicalIF":0.0,"publicationDate":"1991-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79314329","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}
Pub Date : 1991-09-20DOI: 10.1016/0022-5088(91)90361-7
Ingrid Lindeberg, Y. Andersson
{"title":"The crystal structure of the low temperature form of Co2As","authors":"Ingrid Lindeberg, Y. Andersson","doi":"10.1016/0022-5088(91)90361-7","DOIUrl":"https://doi.org/10.1016/0022-5088(91)90361-7","url":null,"abstract":"","PeriodicalId":17534,"journal":{"name":"Journal of The Less Common Metals","volume":"109 1","pages":"163-169"},"PeriodicalIF":0.0,"publicationDate":"1991-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82500733","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}
Pub Date : 1991-09-20DOI: 10.1016/0022-5088(91)90355-8
Brigitte Eisenmann, Jürgen Klein
K2[GeAs2], Rb2[SnAs2], Cs2[SiP2], Cs2[SiAs2] and Cs2[SnAs2] were prepared from molten mixtures of the elements under an argon atmosphere in Al2O3 crucibles. The compounds form needle-shaped crystals, which are sensitive to moisture. The structures are of the K2[SiP2] type and contain the polyanionic chains composed of edge-sharing tetrahedra, isoelectronic and isostructural with SiS2. The structures were refined from X-ray single-crystal data: space group Ibam (No. 72), Z = 4. K2[GeAs2]: a = 1329.2(4) pm, b = 702.8(3) pm, c = 654.8(3) pm Rb2[SnAs2]: a = 1397.4(4) pm, b = 745.4(3) pm, c = 694.2(3) pm Cs2[SiP2]: a = 1412.7(4) pm, b = 746.2(3) pm, c = 619.6(3) pm Cs2[SiAs2]: a = 1442.5(4) pm, b = 757.1(3) pm, c = 642.0(3) pm Cs2[SnAs2]: a = 1465.7(4) pm, b = 773.3(3) pm, c = 695.3(3) pm
{"title":"SiS2-isostrukturelle Anionen [SiP22−], [GeAs22−] und [SnAs22−] in Alkaliverbindungen","authors":"Brigitte Eisenmann, Jürgen Klein","doi":"10.1016/0022-5088(91)90355-8","DOIUrl":"https://doi.org/10.1016/0022-5088(91)90355-8","url":null,"abstract":"<div><p>K<sub>2</sub>[GeAs<sub>2</sub>], Rb<sub>2</sub>[SnAs<sub>2</sub>], Cs<sub>2</sub>[SiP<sub>2</sub>], Cs<sub>2</sub>[SiAs<sub>2</sub>] and Cs<sub>2</sub>[SnAs<sub>2</sub>] were prepared from molten mixtures of the elements under an argon atmosphere in Al<sub>2</sub>O<sub>3</sub> crucibles. The compounds form needle-shaped crystals, which are sensitive to moisture. The structures are of the K<sub>2</sub>[SiP<sub>2</sub>] type and contain the polyanionic chains <span><math><msub><mi></mi><mn>∞</mn></msub><msup><mi></mi><mn>1</mn></msup><mtext>[SiP</mtext><msub><mi></mi><mn><mtext>4</mtext><mtext>2</mtext></mn></msub><msup><mi></mi><mn>2−</mn></msup><mtext>], </mtext><msub><mi></mi><mn>∞</mn></msub><msup><mi></mi><mn>1</mn></msup><mtext>[SiAs</mtext><msub><mi></mi><mn><mtext>4</mtext><mtext>2</mtext></mn></msub><msup><mi></mi><mn>2−</mn></msup><mtext>], </mtext><msub><mi></mi><mn>∞</mn></msub><msup><mi></mi><mn>1</mn></msup><mtext>[GeAs</mtext><msub><mi></mi><mn><mtext>4</mtext><mtext>2</mtext></mn></msub><msup><mi></mi><mn>2−</mn></msup><mtext>] and </mtext><msub><mi></mi><mn>∞</mn></msub><msup><mi></mi><mn>1</mn></msup><mtext>[SnAs</mtext><msub><mi></mi><mn><mtext>4</mtext><mtext>2</mtext></mn></msub><msup><mi></mi><mn>2−</mn></msup><mtext>]</mtext></math></span> composed of edge-sharing tetrahedra, isoelectronic and isostructural with SiS<sub>2</sub>. The structures were refined from X-ray single-crystal data: space group <em>Ibam</em> (No. 72), <em>Z</em> = 4. K<sub>2</sub>[GeAs<sub>2</sub>]: <em>a</em> = 1329.2(4) pm, <em>b</em> = 702.8(3) pm, <em>c</em> = 654.8(3) pm Rb<sub>2</sub>[SnAs<sub>2</sub>]: <em>a</em> = 1397.4(4) pm, <em>b</em> = 745.4(3) pm, <em>c</em> = 694.2(3) pm Cs<sub>2</sub>[SiP<sub>2</sub>]: <em>a</em> = 1412.7(4) pm, <em>b</em> = 746.2(3) pm, <em>c</em> = 619.6(3) pm Cs<sub>2</sub>[SiAs<sub>2</sub>]: <em>a</em> = 1442.5(4) pm, <em>b</em> = 757.1(3) pm, <em>c</em> = 642.0(3) pm Cs<sub>2</sub>[SnAs<sub>2</sub>]: <em>a</em> = 1465.7(4) pm, <em>b</em> = 773.3(3) pm, <em>c</em> = 695.3(3) pm</p></div>","PeriodicalId":17534,"journal":{"name":"Journal of The Less Common Metals","volume":"175 1","pages":"Pages 109-117"},"PeriodicalIF":0.0,"publicationDate":"1991-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0022-5088(91)90355-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71731603","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}
Pub Date : 1991-09-20DOI: 10.1016/0022-5088(91)90360-G
Ingrid Lindeberg, Y. Andersson
{"title":"The ternary system Co-Ga-As at 800 °C","authors":"Ingrid Lindeberg, Y. Andersson","doi":"10.1016/0022-5088(91)90360-G","DOIUrl":"https://doi.org/10.1016/0022-5088(91)90360-G","url":null,"abstract":"","PeriodicalId":17534,"journal":{"name":"Journal of The Less Common Metals","volume":"80 1","pages":"155-162"},"PeriodicalIF":0.0,"publicationDate":"1991-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75302425","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}
Pub Date : 1991-09-20DOI: 10.1016/0022-5088(91)90349-9
T. Ogawa, T. Iwai, M. Kurata
{"title":"Demixing of U-Zr alloys under a thermal gradient","authors":"T. Ogawa, T. Iwai, M. Kurata","doi":"10.1016/0022-5088(91)90349-9","DOIUrl":"https://doi.org/10.1016/0022-5088(91)90349-9","url":null,"abstract":"","PeriodicalId":17534,"journal":{"name":"Journal of The Less Common Metals","volume":"4 1","pages":"59-69"},"PeriodicalIF":0.0,"publicationDate":"1991-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81492509","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}
Pub Date : 1991-09-20DOI: 10.1016/0022-5088(91)90351-4
F. Padella, E. Paradiso, N. Burgio, M. Magini, S. Martelli, W. Guo, A. Iasonna
{"title":"Mechanical alloying of the Pd-Si system in controlled conditions of energy transfer","authors":"F. Padella, E. Paradiso, N. Burgio, M. Magini, S. Martelli, W. Guo, A. Iasonna","doi":"10.1016/0022-5088(91)90351-4","DOIUrl":"https://doi.org/10.1016/0022-5088(91)90351-4","url":null,"abstract":"","PeriodicalId":17534,"journal":{"name":"Journal of The Less Common Metals","volume":"73 1","pages":"79-90"},"PeriodicalIF":0.0,"publicationDate":"1991-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90032526","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}
Pub Date : 1991-09-20DOI: 10.1016/0022-5088(91)90350-D
R. Gürler , J.N. Pratt
Phase relationships in the system Mo-Pd in the temperature range 880–1100°C were re-investigated using ultra-rapidly solidified samples. The finely divided microstructures produced using this technique were found to achieve equilibrium on annealing much more rapidly than conventionally prepared materials. Optical microscopy, X-ray diffraction methods and scanning and analytical electron microscopy were used for phase characterization. The solubility limits of the molybdenum-rich and palladium-rich terminal solid solutions were established. No intermediate phases were found at the temperatures investigated.
{"title":"Constitutional studies of molybdenum-palladium alloys using ultra-rapidly solidified samples","authors":"R. Gürler , J.N. Pratt","doi":"10.1016/0022-5088(91)90350-D","DOIUrl":"https://doi.org/10.1016/0022-5088(91)90350-D","url":null,"abstract":"<div><p>Phase relationships in the system Mo-Pd in the temperature range 880–1100°C were re-investigated using ultra-rapidly solidified samples. The finely divided microstructures produced using this technique were found to achieve equilibrium on annealing much more rapidly than conventionally prepared materials. Optical microscopy, X-ray diffraction methods and scanning and analytical electron microscopy were used for phase characterization. The solubility limits of the molybdenum-rich and palladium-rich terminal solid solutions were established. No intermediate phases were found at the temperatures investigated.</p></div>","PeriodicalId":17534,"journal":{"name":"Journal of The Less Common Metals","volume":"175 1","pages":"Pages 71-78"},"PeriodicalIF":0.0,"publicationDate":"1991-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0022-5088(91)90350-D","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71731614","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}
Pub Date : 1991-09-20DOI: 10.1016/0022-5088(91)90345-5
K. Schwetz, P. Karduck
{"title":"Investigations in the boron-carbon system with the aid of electron probe microanalysis","authors":"K. Schwetz, P. Karduck","doi":"10.1016/0022-5088(91)90345-5","DOIUrl":"https://doi.org/10.1016/0022-5088(91)90345-5","url":null,"abstract":"","PeriodicalId":17534,"journal":{"name":"Journal of The Less Common Metals","volume":"83 1","pages":"1-11"},"PeriodicalIF":0.0,"publicationDate":"1991-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83762030","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}
扫码关注我们
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号