Diamond,with ultrahigh hardness,high wear resistance,high thermal conductivity,and so forth,has attracted worldwide attention.However,researchers found emergent reactions at the interfaces between diamond and ferrous ...Diamond,with ultrahigh hardness,high wear resistance,high thermal conductivity,and so forth,has attracted worldwide attention.However,researchers found emergent reactions at the interfaces between diamond and ferrous materials,which significantly affects the performance of diamond-based devices.Herein,combing experiments and theoretical calculations,taking diamond–iron(Fe)interface as a prototype,the counter-diffusion mechanism of Fe/carbon atoms has been established.Surprisingly,it is identified that Fe and diamond first form a coherent interface,and then Fe atoms diffuse into diamond and prefer the carbon vacancies sites.Meanwhile,the relaxed carbon atoms diffuse into the Fe lattice,forming Fe_(3)C.Moreover,graphite is observed at the Fe_(3)C surface when Fe_(3)C is over-saturated by carbon atoms.The present findings are expected to offer new insights into the atomic mechanism for diamondferrous material's interfacial reactions,benefiting diamond-based device applications.展开更多
Diamond possesses excellent thermal conductivity and tunable bandgap.Currently,the high-pressure,high-temperature,and chemical vapor deposition methods are the most promising strategies for the commercial-scale produc...Diamond possesses excellent thermal conductivity and tunable bandgap.Currently,the high-pressure,high-temperature,and chemical vapor deposition methods are the most promising strategies for the commercial-scale production of synthetic diamond.Although diamond has been extensively employed in jewelry and cutting/grinding tasks,the realization of its high-end applications through microstructure engineering has long been sought.Herein,we discuss the microstructures encountered in diamond and further concentrate on cutting-edge investigations utilizing electron microscopy techniques to illuminate the transition mechanism between graphite and diamond during the synthesis and device constructions.The impacts of distinct microstructures on the electrical applications of diamond,especially the photoelectrical,electrical,and thermal properties,are elaborated.The recently reported elastic and plastic deformations revealed through in situ microscopy techniques are also summarized.Finally,the limitations,perspectives,and corresponding solutions are proposed.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.12274371,62271450,U21A2070,21805247,12074345)Cross-Disciplinary Innovative Research Group Project of Henan Province(Grant No.232300421004).
文摘Diamond,with ultrahigh hardness,high wear resistance,high thermal conductivity,and so forth,has attracted worldwide attention.However,researchers found emergent reactions at the interfaces between diamond and ferrous materials,which significantly affects the performance of diamond-based devices.Herein,combing experiments and theoretical calculations,taking diamond–iron(Fe)interface as a prototype,the counter-diffusion mechanism of Fe/carbon atoms has been established.Surprisingly,it is identified that Fe and diamond first form a coherent interface,and then Fe atoms diffuse into diamond and prefer the carbon vacancies sites.Meanwhile,the relaxed carbon atoms diffuse into the Fe lattice,forming Fe_(3)C.Moreover,graphite is observed at the Fe_(3)C surface when Fe_(3)C is over-saturated by carbon atoms.The present findings are expected to offer new insights into the atomic mechanism for diamondferrous material's interfacial reactions,benefiting diamond-based device applications.
基金supported by the National Key Research and Development Program of China (Grant No.2022YFB3608604)National Natural Science Foundation of China (Grant Nos.12274371,52072345,62271450,U21A2070,and 62027816)+1 种基金Natural Science Foundation of Henan Province (Grant Nos.222300420077,222301420037)Foundation for the Returned Overseas Researchers of Henan Province.
文摘Diamond possesses excellent thermal conductivity and tunable bandgap.Currently,the high-pressure,high-temperature,and chemical vapor deposition methods are the most promising strategies for the commercial-scale production of synthetic diamond.Although diamond has been extensively employed in jewelry and cutting/grinding tasks,the realization of its high-end applications through microstructure engineering has long been sought.Herein,we discuss the microstructures encountered in diamond and further concentrate on cutting-edge investigations utilizing electron microscopy techniques to illuminate the transition mechanism between graphite and diamond during the synthesis and device constructions.The impacts of distinct microstructures on the electrical applications of diamond,especially the photoelectrical,electrical,and thermal properties,are elaborated.The recently reported elastic and plastic deformations revealed through in situ microscopy techniques are also summarized.Finally,the limitations,perspectives,and corresponding solutions are proposed.
