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Journal of Physics F: Metal Physics最新文献

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Magnetovolume effect in ferromagnetic metals 铁磁性金属中的磁体积效应
Journal of Physics F: Metal Physics Pub Date : 1988-09-01 DOI: 10.1088/0305-4608/18/9/025
I. Takahashi, M. Shimizu
{"title":"Magnetovolume effect in ferromagnetic metals","authors":"I. Takahashi, M. Shimizu","doi":"10.1088/0305-4608/18/9/025","DOIUrl":"https://doi.org/10.1088/0305-4608/18/9/025","url":null,"abstract":"It is shown that the magnetovolume effect in ferromagnetic metals can be estimated by using two functions, b(M,V)= delta F(M,V)/ delta M and p(M,V)=- delta F(M,V)/ delta V, where F(M,V) is the free energy of the system with magnetic moment M and volume V. The magnetovolume effect in ferromagnetic BCC iron at zero temperature is estimated numerically by using the spin density functional formalism. The band structure used in the numerical calculation is obtained by the linear muffin-tin orbital method. The calculated results of the magnetovolume effect indicate the necessity to improve the local spin density approximation in the ferromagnetic state.","PeriodicalId":16828,"journal":{"name":"Journal of Physics F: Metal Physics","volume":"2 1","pages":"2081-2088"},"PeriodicalIF":0.0,"publicationDate":"1988-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83561364","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: 5
Theoretical strain-induced elastic anomalies in metals and alloys 金属和合金中理论应变引起的弹性异常
Journal of Physics F: Metal Physics Pub Date : 1988-09-01 DOI: 10.1088/0305-4608/18/9/012
J. Marschall, F. Milstein
{"title":"Theoretical strain-induced elastic anomalies in metals and alloys","authors":"J. Marschall, F. Milstein","doi":"10.1088/0305-4608/18/9/012","DOIUrl":"https://doi.org/10.1088/0305-4608/18/9/012","url":null,"abstract":"The theoretical large-strain elastic response of crystals has long been a subject of interest. Although various atomic models have been used in a variety of theoretical computations, considerations that have largely been neglected are the anomalous stress and elastic moduli variations that occur when a Brillouin zone boundary is brought into contact with the Fermi surface as a result of deformation. The present work rationalises these occurrences for axial loadings of BCC and FCC crystals. Various pseudopotential model computations are carried out for the specific case of (100) uniaxial loading. With q a reciprocal lattice vector, kf the Fermi wavenumber, lambda 1 the axial stretch in (100) loading and z the valence, the results are summarised as plots of the 'critical value' of lambda 1 (i.e. lambda 1 at q=2kf) against z. Examples of pseudopotential model computations of the elastic moduli Cij of Al as q to 2kf are also presented.","PeriodicalId":16828,"journal":{"name":"Journal of Physics F: Metal Physics","volume":"56 1","pages":"1913-1925"},"PeriodicalIF":0.0,"publicationDate":"1988-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87538052","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: 4
Magnetic transitions in dysprosium: a calorimetric study 镝中的磁跃迁:一项量热研究
Journal of Physics F: Metal Physics Pub Date : 1988-09-01 DOI: 10.1088/0305-4608/18/9/028
H. Astrom, G. Benediktsson
{"title":"Magnetic transitions in dysprosium: a calorimetric study","authors":"H. Astrom, G. Benediktsson","doi":"10.1088/0305-4608/18/9/028","DOIUrl":"https://doi.org/10.1088/0305-4608/18/9/028","url":null,"abstract":"The nature of the magnetic transitions in high-purity dysprosium has been investigated with a high-resolution microcalorimeter. Single crystals of two purities corresponding to RRR values of 88 (Dy(A)) and 15 (Dy(B)) have been studied. At Tn the authors have observed an energy peak for both materials of 7 J mol-1 extending over a few tenths of a degree. The transition temperatures were 180.6+or-0.1 K for Dy(A) and 178.7+or-0.1 K for Dy(B). A small thermal hysteresis in TN was observed for both materials. The data suggest a weak first-order transition at TN. The first-order nature of the ferromagnetic transition has been confirmed. The latent heat measured was 35+or-2 J mol-1 and 17+or-3 J mol-1 and the transition temperature 91.1+or-0.2 and 90.3+or-0.2 K for Dy(A) and Dy(B) respectively. The latent heats are in fair agreement with calculated values. Commensurate turn-angle effects have been sought in the helical regime. For Dy(A) small energy peaks of 0.2+or-0.1 J mol-1 were observed at 166+or-2 K and 173+or-1 K. The temperatures for the energy changes are close to two of the temperatures of commensurability obtained from neutron diffraction data.","PeriodicalId":16828,"journal":{"name":"Journal of Physics F: Metal Physics","volume":"59 1","pages":"2113-2120"},"PeriodicalIF":0.0,"publicationDate":"1988-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84006597","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: 8
Interplay of the Boltzmann-type ordinary transport and quantum corrections in Ag-Cu-Ge amorphous alloy system. I. Temperature dependence of electrical resistivity Ag-Cu-Ge非晶合金体系中玻尔兹曼型普通输运与量子修正的相互作用。电阻率的温度依赖性
Journal of Physics F: Metal Physics Pub Date : 1988-09-01 DOI: 10.1088/0305-4608/18/9/018
U. Mizutani, K. Sato, I. Sakamoto, K. Yonemitsu
{"title":"Interplay of the Boltzmann-type ordinary transport and quantum corrections in Ag-Cu-Ge amorphous alloy system. I. Temperature dependence of electrical resistivity","authors":"U. Mizutani, K. Sato, I. Sakamoto, K. Yonemitsu","doi":"10.1088/0305-4608/18/9/018","DOIUrl":"https://doi.org/10.1088/0305-4608/18/9/018","url":null,"abstract":"The electrical resistivity has been measured in the temperature range 2-300 K for (Ag0.5Cu0.5)1-xGex amorphous alloys over a wide composition range 0<or=x<or=0.95. The scattering mechanism is analysed in the metallic regime, which is assumed to persist up to 60 at.% Ge alloy or the resistivity below approximately 1000 mu Omega cm. In the low-resistivity regime below about 200 mu Omega cm, the rho -T characteristics can be consistently explained in terms of the ordinary scattering mechanism based on the Boltzmann equation or the generalised Faber-Ziman theory. In the high-resistivity regime above 200 mu Omega cm, the quantum corrections are shown to play a significant role: the rho -T characteristics below 15 K and above about 30 K are essentially caused by the electron-electron and the electron-phonon interaction respectively. The dominant role of quantum corrections has been also confirmed by studying the effect of the dimensionality on the rho -T characteristics.","PeriodicalId":16828,"journal":{"name":"Journal of Physics F: Metal Physics","volume":"7 1","pages":"1995-2007"},"PeriodicalIF":0.0,"publicationDate":"1988-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81628529","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: 16
Electrical and optical properties of discontinuous Al films near the percolation threshold 在渗透阈值附近不连续Al膜的电学和光学性质
Journal of Physics F: Metal Physics Pub Date : 1988-09-01 DOI: 10.1088/0305-4608/18/9/023
E. Dobierzewska-Mozrzymas, P. Bieganski
{"title":"Electrical and optical properties of discontinuous Al films near the percolation threshold","authors":"E. Dobierzewska-Mozrzymas, P. Bieganski","doi":"10.1088/0305-4608/18/9/023","DOIUrl":"https://doi.org/10.1088/0305-4608/18/9/023","url":null,"abstract":"The electrical and optical properties of discontinuous Al films on NaCl substrates have been investigated. The temperature dependence of the resistance and the TCR were determined in situ under vacuum conditions for films with various volume fractions q. The reflectivity was measured in the spectral range from 220 to 700 nm. It has been found that the electrical and optical properties of the film are subject to significant changes near the percolation threshold, which is characterised by the critical range of the volume fraction ( Delta qc). This behaviour is to be attributed to the change in the type of conduction and in the character of optical properties. Films having volume fractions q Delta qc the optical anomalies disappear and the TCR is greater than zero.","PeriodicalId":16828,"journal":{"name":"Journal of Physics F: Metal Physics","volume":"60 1","pages":"2061-2067"},"PeriodicalIF":0.0,"publicationDate":"1988-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79481116","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: 13
An icosahedral phase formed during annealing of ion-irradiated Fe-Mo amorphous films 离子辐照Fe-Mo非晶薄膜退火过程中形成二十面体相
Journal of Physics F: Metal Physics Pub Date : 1988-09-01 DOI: 10.1088/0305-4608/18/9/001
C. Shang, Jiahao Li, H. D. Li, B. Liu
{"title":"An icosahedral phase formed during annealing of ion-irradiated Fe-Mo amorphous films","authors":"C. Shang, Jiahao Li, H. D. Li, B. Liu","doi":"10.1088/0305-4608/18/9/001","DOIUrl":"https://doi.org/10.1088/0305-4608/18/9/001","url":null,"abstract":"An icosahedral phase has been observed in the Fe-Mo system for the first time. The new icosahedral phase was formed during thermal annealing of ion-irradiated Fe-Mo amorphous films, which were prepared by sputtering from an Fe50Mo50 alloy ingot. The atomic concentration of this phase was determined by in situ energy-dispersive spectra (EDS) to be around Fe40Mo60 which has been proved to be a favourable composition for ion-induced amorphisation in this system.","PeriodicalId":16828,"journal":{"name":"Journal of Physics F: Metal Physics","volume":"50 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1988-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84702730","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: 6
Thermal expansion and ultrasonic velocity and attenuation at the continuous Neel transition in Cr+0.2 at.% V Cr+0.2 at连续Neel转变时的热膨胀、超声速度和衰减。% V
Journal of Physics F: Metal Physics Pub Date : 1988-09-01 DOI: 10.1088/0305-4608/18/9/009
P. C. D. Carmargo, E. P. Castro, E. Fawcett
{"title":"Thermal expansion and ultrasonic velocity and attenuation at the continuous Neel transition in Cr+0.2 at.% V","authors":"P. C. D. Carmargo, E. P. Castro, E. Fawcett","doi":"10.1088/0305-4608/18/9/009","DOIUrl":"https://doi.org/10.1088/0305-4608/18/9/009","url":null,"abstract":"The thermal expansion of a high quality Cr+0.2 at.% V single crystal shows a well defined continuous Neel transition in contrast with the weak first-order transition in Cr. The change in the nature of the ultrasonic velocity and attenuation anomalies at the phase transition also supports the idea that a tricritical point occurs at some concentration less than 0.2 at.% V in Cr.","PeriodicalId":16828,"journal":{"name":"Journal of Physics F: Metal Physics","volume":"41 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1988-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87655694","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: 5
Comparative investigation of structural and transport properties of L10 NiPt and Copt phases; the role of magnetism L10 NiPt和Copt相结构和输运性质的比较研究磁性的作用
Journal of Physics F: Metal Physics Pub Date : 1988-09-01 DOI: 10.1088/0305-4608/18/9/021
C. Leroux, M. Cadeville, V. Pierron-Bohnes, G. Inden, F. Hinz
{"title":"Comparative investigation of structural and transport properties of L10 NiPt and Copt phases; the role of magnetism","authors":"C. Leroux, M. Cadeville, V. Pierron-Bohnes, G. Inden, F. Hinz","doi":"10.1088/0305-4608/18/9/021","DOIUrl":"https://doi.org/10.1088/0305-4608/18/9/021","url":null,"abstract":"The retilt 01 :I compar;itivc investigation of strueturiil and transport properties of equiatomic NiPt and C'oPt ph;ies. in their ordered and disordered states. iire presented and dicusetl. The tho compounds displa) the same hind ol order-disorder transforma- tion LI,,-h, in rhcir pir;imagnetic tate. In thi stud!. atrcntion viis paid to make iiieiiiiremcnts on ampies in well detined thermod~n,imie state. U hich can he either equilihriuin statcs or quenched one. Thi in~estig;ition hi)& that the atomic disorder gencr;ited hy the thermal effect or h) contitution:il deleet (o('C-toichiometr! ) hiis jimilur consequences on the structure (tetragon;ility ratio) irnd on the reidual rcistivit) in the tho compounds. A grcat ditt'erence occur in the high-Tmistivity. he lo^ and iit the 0-1) translormation temperature (T,),)). Whcre;i NiPt displa)s ;I hehakiour typical of this kind of transforina- tion. Copt how unexpected rcults. in particular ii decrease in its resistibity ;it To,,. Such ;I dil'lerence can he e.;pl;iincd by taking into account the pin-disorder cattcring contribu- tion to the resistiity. which I larger in Copt than in NiPt. A process hased on the existence ol Huctu;iting Ioc,il magnetic moment and magnetic short-range order in the p;iramagnetic state of C'oPt i propowd to expl;iin the ohserved hehaviour qualitatiely.","PeriodicalId":16828,"journal":{"name":"Journal of Physics F: Metal Physics","volume":"374 1","pages":"2033-2051"},"PeriodicalIF":0.0,"publicationDate":"1988-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75123288","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: 134
Calculation of diffraction patterns of the icosahedral phase 二十面体相衍射图样的计算
Journal of Physics F: Metal Physics Pub Date : 1988-09-01 DOI: 10.1088/0305-4608/18/9/010
Dongshan Zhao, Renhui Wang, Yifan Cheng, Zhouguang Wang
{"title":"Calculation of diffraction patterns of the icosahedral phase","authors":"Dongshan Zhao, Renhui Wang, Yifan Cheng, Zhouguang Wang","doi":"10.1088/0305-4608/18/9/010","DOIUrl":"https://doi.org/10.1088/0305-4608/18/9/010","url":null,"abstract":"The method of calculating electron diffraction patterns of the simple quasilattice developed by Elser (1985, 1986) has been generalised to the case where the icosahedral phase is stacked with 20 prolate and oblate rhombohedra and each rhombohedron has the same atomic decoration. The electron diffraction patterns and the powder X-ray and neutron diffraction patterns for four atomic models have been calculated and compared with experimental ones.","PeriodicalId":16828,"journal":{"name":"Journal of Physics F: Metal Physics","volume":"10 1","pages":"1893-1904"},"PeriodicalIF":0.0,"publicationDate":"1988-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89228494","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: 4
A laboratory EXAFS facility adapted to thin-film studies 适用于薄膜研究的实验室EXAFS设备
Journal of Physics F: Metal Physics Pub Date : 1988-09-01 DOI: 10.1088/0305-4608/18/9/029
J. Mimault, T. Girardeau, M. Jaouen
{"title":"A laboratory EXAFS facility adapted to thin-film studies","authors":"J. Mimault, T. Girardeau, M. Jaouen","doi":"10.1088/0305-4608/18/9/029","DOIUrl":"https://doi.org/10.1088/0305-4608/18/9/029","url":null,"abstract":"The authors describe an experimental set-up which offers laboratory EXAFS facilities for thin-film characterisation. To be close to the usual transmission-mode EXAFS, they use the specular reflectivity properties of X-rays on solid surfaces. An application to the ion beam mixing of an Fe-Al multilayered sample is reported.","PeriodicalId":16828,"journal":{"name":"Journal of Physics F: Metal Physics","volume":"8 1","pages":"2121-2134"},"PeriodicalIF":0.0,"publicationDate":"1988-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88548213","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: 0
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