A systematic study on the structural, magnetic, and electrical transport properties was performed for the LaMnlxCUxO3 system. A single phase of orthorhornbic perovskite structure was formed for x = 0.05-0.40. A striki...A systematic study on the structural, magnetic, and electrical transport properties was performed for the LaMnlxCUxO3 system. A single phase of orthorhornbic perovskite structure was formed for x = 0.05-0.40. A striking paramagnetic-ferromagnetic transition and a considerable magnetoresistance effect were observed at the ferromagnetic ordering temperature Tc, but no insulator-metal transition induced by Cu-doping was observed. Below Tc, a visible unexpected drop was observed in the ac susceptibility and zero-field-cooled dc magnetization for the dilute doped samples with x≤0.10, which was proven to be associated with domain wall pinning effects by milling the bulk material into single domain particles. It is validated that there is no exchange interaction between Cu and Mn, and double exchange interactions between Mn^3＋ and Mn^4＋ are induced by Cu-doping in the anti-ferromagnetic LaMnO3 matrix, whereas the severe distortion and disorder caused by occupied-dopant prohibits charge carriers from hopping.展开更多
Neutron diffraction study on the structure of Bi_(2)Sr_(1.855)Ca_(1.145)Cu_(2)O_(8) was carried out.Data refinements show that the average subcell structure for Bi_(2)Sr_(1.855)Ca_(1.145)Cu_(2)O_(8) is in the best fit...Neutron diffraction study on the structure of Bi_(2)Sr_(1.855)Ca_(1.145)Cu_(2)O_(8) was carried out.Data refinements show that the average subcell structure for Bi_(2)Sr_(1.855)Ca_(1.145)Cu_(2)O_(8) is in the best fit of the space group Fmmm and the structure is described by alternate stacking of SrO-CuO_(2)-Ca-CuO_(2)-SrO slab and a double BiO layers.An oxygen layer sandwiched by the bismuth layers was conRrmed.展开更多
Since the Material Genome Initiative(MGI) was proposed, high-throughput based technology has been widely employed in various fields of materials science. As a theoretical guide, material informatics has been introduce...Since the Material Genome Initiative(MGI) was proposed, high-throughput based technology has been widely employed in various fields of materials science. As a theoretical guide, material informatics has been introduced based on machine learning and data mining and high-throughput computation has been employed for large scale search, narrowing down the scope of the experiment trials. High-throughput materials experiments including synthesis, processing, and characterization technologies have become valuable research tools to pin down the prediction experimentally, enabling the discovery-to-deployment of advances materials more efficiently at a fraction of cost. This review aims to summarize the recent advances of high-throughput materials experiments and introduce briefly the development of materials design based on material genome concept. By selecting representative and classic works in the past years, various high-throughput preparation methods are introduced for different types of material gradient libraries, including metallic, inorganic materials, and polymers. Furthermore, high-throughput characterization approaches are comprehensively discussed, including both their advantages and limitations. Specifically, we focus on high-throughput mass spectrometry to analyze its current status and challenges in the application of catalysts screening.展开更多
基金supported by Shanghai Rising-Star Program (No. 11QH1401000)the National Natural Science Foundation of China (No. 50932003)+1 种基金the Key Project of Chinese Ministry of Education (No. 211055)Shanghai Research Special Fund for Outstanding Young Teachers (No. sdl10009)
文摘A systematic study on the structural, magnetic, and electrical transport properties was performed for the LaMnlxCUxO3 system. A single phase of orthorhornbic perovskite structure was formed for x = 0.05-0.40. A striking paramagnetic-ferromagnetic transition and a considerable magnetoresistance effect were observed at the ferromagnetic ordering temperature Tc, but no insulator-metal transition induced by Cu-doping was observed. Below Tc, a visible unexpected drop was observed in the ac susceptibility and zero-field-cooled dc magnetization for the dilute doped samples with x≤0.10, which was proven to be associated with domain wall pinning effects by milling the bulk material into single domain particles. It is validated that there is no exchange interaction between Cu and Mn, and double exchange interactions between Mn^3＋ and Mn^4＋ are induced by Cu-doping in the anti-ferromagnetic LaMnO3 matrix, whereas the severe distortion and disorder caused by occupied-dopant prohibits charge carriers from hopping.
基金Supported by the National Natural Science Foundation of Chinathe National Center for Research and Development on Superconductivity.
文摘Neutron diffraction study on the structure of Bi_(2)Sr_(1.855)Ca_(1.145)Cu_(2)O_(8) was carried out.Data refinements show that the average subcell structure for Bi_(2)Sr_(1.855)Ca_(1.145)Cu_(2)O_(8) is in the best fit of the space group Fmmm and the structure is described by alternate stacking of SrO-CuO_(2)-Ca-CuO_(2)-SrO slab and a double BiO layers.An oxygen layer sandwiched by the bismuth layers was conRrmed.
基金supported by the Shanghai Sailing Program(Grant No.17YF1405700)the Shanghai Pujiang Program(Grant No.17PJ1402800)+2 种基金the National Natural Science Foundation of China(Grant No.21705106)the support of the Shanghai Institute of Materials Genome from the Shanghai Municipal Science,and the Technology Commissionthe Program for Professor of Special Appointment(Eastern Scholar)at the Shanghai Institution of Higher Learning(Grant No.TP2016023)
文摘Since the Material Genome Initiative(MGI) was proposed, high-throughput based technology has been widely employed in various fields of materials science. As a theoretical guide, material informatics has been introduced based on machine learning and data mining and high-throughput computation has been employed for large scale search, narrowing down the scope of the experiment trials. High-throughput materials experiments including synthesis, processing, and characterization technologies have become valuable research tools to pin down the prediction experimentally, enabling the discovery-to-deployment of advances materials more efficiently at a fraction of cost. This review aims to summarize the recent advances of high-throughput materials experiments and introduce briefly the development of materials design based on material genome concept. By selecting representative and classic works in the past years, various high-throughput preparation methods are introduced for different types of material gradient libraries, including metallic, inorganic materials, and polymers. Furthermore, high-throughput characterization approaches are comprehensively discussed, including both their advantages and limitations. Specifically, we focus on high-throughput mass spectrometry to analyze its current status and challenges in the application of catalysts screening.
