Magnetically soft Fe-Co-based nanocrystalline alloy films were produced by two preparation methods:One using a new energetic cluster deposition technique and another using a conventional magnetron sputtering technique...Magnetically soft Fe-Co-based nanocrystalline alloy films were produced by two preparation methods:One using a new energetic cluster deposition technique and another using a conventional magnetron sputtering technique.Their structural,static magnetic properties and high-frequency magnetic characteristics were investigated.In the energetic cluster deposition method,by applying a high-bias voltage to a substrate,positively charged clusters in a cluster beam were accelerated electrically and deposited onto a negatively biased substrate together with neutral clusters from the same cluster source,to form a high-density Fe-Co alloy cluster-assembled film with good high-frequency magnetic characteristics.In the conventional magnetron sputtering method,only by rotating substrate holder and without applying a static inducing magnetic field on the substrates,we produced Fe-Co-based nanocrystalline alloy films with a remarkable in-plane uniaxial magnetic anisotropy and a good soft magnetic property.The obtained Fe-Co-O,Fe-Co-Ti-N,and Fe-Co-Cr-N films all revealed a high real permeability exceeding 500 at a frequency up to 1.2 GHz.This makes Fe-Co-based nanocrystalline alloy films potential candidates as soft magnetic thin film materials for the high-frequency applications.展开更多
FeCoN soft magnetic thin films are prepared by using the reactive direct-current magnetron sputtering technique. It is found that the addition of N2 can reduce the coercivity of the FeCoN film, and excellent soft magn...FeCoN soft magnetic thin films are prepared by using the reactive direct-current magnetron sputtering technique. It is found that the addition of N2 can reduce the coercivity of the FeCoN film, and excellent soft magnetic properties can be obtained when the ratio of N2 flow to total gas flow is 10%. The influences of texture, grain size, and stress on the magnetic properties and the high-frequency behaviors of the films are also discussed.展开更多
An Fe–44Ni nanocrystalline（NC） alloy thin film was prepared through electrodeposition. The relation between the microstructure and corrosion behavior of the NC film was investigated using electrochemical methods an...An Fe–44Ni nanocrystalline（NC） alloy thin film was prepared through electrodeposition. The relation between the microstructure and corrosion behavior of the NC film was investigated using electrochemical methods and chemical analysis approaches. The results show that the NC film is composed of a face-centered cubic phase（γ-（Fe,Ni）） and a body-centered cubic phase（α-（Fe,Ni）） when it is annealed at temperatures less than 400℃. The corrosion resistance increases with the increase in grain size, and the corresponding corrosion process is controlled by oxygen reduction. The NC films annealed at 500℃ and 600℃ do not exhibit the same pattern, although their grain sizes are considerably large. This result is attributed to the existence of an anodic phase, Fe0.947Ni0.054, in these films. Under this condition, the related corrosion process is synthetically controlled by anodic dissolution and depolarization.展开更多
Refractory high-entropy alloys(HEAs)possess many useful properties such as high strength and high-temperature stability.So far,most studies on refractory HEAs have been limited to a few well-known compositions and on ...Refractory high-entropy alloys(HEAs)possess many useful properties such as high strength and high-temperature stability.So far,most studies on refractory HEAs have been limited to a few well-known compositions and on their coarse-grain bulk forms.Here we fabricate nanocrystalline(TiZrHf)_(x)(NbTa)_(1−x)HEA thin films with a large range of compositions(x=0.07–0.90)by the direct current(DC)magnetron co-sputtering technique and measure their mechanical properties using the nanoindentation method.All the as-deposited HEA thin films show a solid-solution body-centered cubic(bcc)structure.As the compositional ratio(x)increases,the elastic modulus decreases from 153 to 123 GPa,following the trend of the rule of mixture.As x increases,the hardness first decreases from 6.5 GPa(x=0.07)to the lowest value(4.6 GPa,x=0.48)and then increases to the highest value(7.1 GPa,x=0.90),showing a concave trend.The change in hardness might be attributed to the combinational influence caused by the atomic size and modulus effects,as well as the texture effect.The authors also propose a few open questions for future studies on this and related HEA systems.展开更多
系统研究两种不同形态的硅氧合金薄膜,用甚高频PECVD系统制备的非晶硅氧和纳米硅氧薄膜的特性,以及其在纳米硅薄膜叠层薄膜太阳电池中的应用。实验中主要通过对不同的气体流量比的优化、沉积功率和沉积压力的优化,分别制备出光学带隙约...系统研究两种不同形态的硅氧合金薄膜,用甚高频PECVD系统制备的非晶硅氧和纳米硅氧薄膜的特性,以及其在纳米硅薄膜叠层薄膜太阳电池中的应用。实验中主要通过对不同的气体流量比的优化、沉积功率和沉积压力的优化,分别制备出光学带隙约为2.1 e V,折射率约为3的a-SiO_x∶B∶H薄膜,作为非晶硅顶电池的p1层,以及带隙为2.2~2.5 e V,折射率为2.0~2.5,晶化率为20%~50%的nc-SiO_x∶P∶H薄膜,作为非晶硅/纳米硅叠层电池的中间反射层和纳米硅的底电池n2层。最后将优化后的a-SiO_x∶B∶H和nc-SiO_x∶P∶H薄膜应用到非晶硅/纳米硅薄膜叠层电池中,在0.79 m^2的玻璃基板上制备出初始峰值功率为101.1 W、全面积初始转换效率为12.8%、稳定峰值功率为87.3 W、全面积稳定转换效率为11.1%的非晶硅/纳米硅叠层电池。展开更多
基金supported by the National Natural Science Foundation of China (Grant Nos.50671087,50971108)the National Outstanding Youth Science Foundation of China (Grant No.50825101)the Intellectual Cluster Project of the Ministry of Education,Culture,Sports,Science,and Technology,Japan,Aichi Prefecture,Nagoya City and Aichi Science and Technology Foundation
文摘Magnetically soft Fe-Co-based nanocrystalline alloy films were produced by two preparation methods:One using a new energetic cluster deposition technique and another using a conventional magnetron sputtering technique.Their structural,static magnetic properties and high-frequency magnetic characteristics were investigated.In the energetic cluster deposition method,by applying a high-bias voltage to a substrate,positively charged clusters in a cluster beam were accelerated electrically and deposited onto a negatively biased substrate together with neutral clusters from the same cluster source,to form a high-density Fe-Co alloy cluster-assembled film with good high-frequency magnetic characteristics.In the conventional magnetron sputtering method,only by rotating substrate holder and without applying a static inducing magnetic field on the substrates,we produced Fe-Co-based nanocrystalline alloy films with a remarkable in-plane uniaxial magnetic anisotropy and a good soft magnetic property.The obtained Fe-Co-O,Fe-Co-Ti-N,and Fe-Co-Cr-N films all revealed a high real permeability exceeding 500 at a frequency up to 1.2 GHz.This makes Fe-Co-based nanocrystalline alloy films potential candidates as soft magnetic thin film materials for the high-frequency applications.
基金Project supported by the National Natural Science Foundation of China (Grant Nos. 10874060 and 60803035)
文摘FeCoN soft magnetic thin films are prepared by using the reactive direct-current magnetron sputtering technique. It is found that the addition of N2 can reduce the coercivity of the FeCoN film, and excellent soft magnetic properties can be obtained when the ratio of N2 flow to total gas flow is 10%. The influences of texture, grain size, and stress on the magnetic properties and the high-frequency behaviors of the films are also discussed.
基金financially supported by the Major State Basic Research Development Program of China (No. 2014CB643300)the National Natural Science Foundation of China (No. U1560104)the National Environmental Corrosion Platform (NECP)
文摘An Fe–44Ni nanocrystalline（NC） alloy thin film was prepared through electrodeposition. The relation between the microstructure and corrosion behavior of the NC film was investigated using electrochemical methods and chemical analysis approaches. The results show that the NC film is composed of a face-centered cubic phase（γ-（Fe,Ni）） and a body-centered cubic phase（α-（Fe,Ni）） when it is annealed at temperatures less than 400℃. The corrosion resistance increases with the increase in grain size, and the corresponding corrosion process is controlled by oxygen reduction. The NC films annealed at 500℃ and 600℃ do not exhibit the same pattern, although their grain sizes are considerably large. This result is attributed to the existence of an anodic phase, Fe0.947Ni0.054, in these films. Under this condition, the related corrosion process is synthetically controlled by anodic dissolution and depolarization.
基金support from the Discovery Grants Program(No.RGPIN-2018-05731)the Natural Sciences and Engineering Research Council of Canada(NSERC)+3 种基金New Frontiers in Research Fund-Exploration(No.NFRFE-2019-00603)Dean’s Spark Assistant Professorship in the Faculty of Applied Science&Engineering atUniversity of Toronto.M.J.R.H.acknowledges the financial support from Vanier Canada Graduate Scholarship(NSERC),Ontario Graduate Scholarship,and Queen Elizabeth II/Eleanor and Burnett Thall Graduate ScholarshipCanada Foundation for Innovation(CFI)-John R.Evans Leaders Fund(JELF)Project#38044.
文摘Refractory high-entropy alloys(HEAs)possess many useful properties such as high strength and high-temperature stability.So far,most studies on refractory HEAs have been limited to a few well-known compositions and on their coarse-grain bulk forms.Here we fabricate nanocrystalline(TiZrHf)_(x)(NbTa)_(1−x)HEA thin films with a large range of compositions(x=0.07–0.90)by the direct current(DC)magnetron co-sputtering technique and measure their mechanical properties using the nanoindentation method.All the as-deposited HEA thin films show a solid-solution body-centered cubic(bcc)structure.As the compositional ratio(x)increases,the elastic modulus decreases from 153 to 123 GPa,following the trend of the rule of mixture.As x increases,the hardness first decreases from 6.5 GPa(x=0.07)to the lowest value(4.6 GPa,x=0.48)and then increases to the highest value(7.1 GPa,x=0.90),showing a concave trend.The change in hardness might be attributed to the combinational influence caused by the atomic size and modulus effects,as well as the texture effect.The authors also propose a few open questions for future studies on this and related HEA systems.
文摘系统研究两种不同形态的硅氧合金薄膜,用甚高频PECVD系统制备的非晶硅氧和纳米硅氧薄膜的特性,以及其在纳米硅薄膜叠层薄膜太阳电池中的应用。实验中主要通过对不同的气体流量比的优化、沉积功率和沉积压力的优化,分别制备出光学带隙约为2.1 e V,折射率约为3的a-SiO_x∶B∶H薄膜,作为非晶硅顶电池的p1层,以及带隙为2.2~2.5 e V,折射率为2.0~2.5,晶化率为20%~50%的nc-SiO_x∶P∶H薄膜,作为非晶硅/纳米硅叠层电池的中间反射层和纳米硅的底电池n2层。最后将优化后的a-SiO_x∶B∶H和nc-SiO_x∶P∶H薄膜应用到非晶硅/纳米硅薄膜叠层电池中,在0.79 m^2的玻璃基板上制备出初始峰值功率为101.1 W、全面积初始转换效率为12.8%、稳定峰值功率为87.3 W、全面积稳定转换效率为11.1%的非晶硅/纳米硅叠层电池。
