Diamant träffar städet med ultrahögt tryck som överstiger 500 GPA-tryck

Recently, Professor Huang Xiaoli from the School of Physics at Jilin University, Professor Tang Aoqing from Jilin University, Professor Cui Tian from Ningbo University, and others have made significant progress in pressure loading technology based on diamond anvil devices. They have achieved a breakthrough of 500 GPa pressure for the first time in China. The research results, titled "Unified Ekvation av tillstånd av volfram upp till 527 GPA med användning av modifierade torsionala diamantstruvceller, "publicerades i tidskriften Phys . Rev . B 111, 21, 4101 (2025) .

 

In recent years, significant progress has been made in high-pressure loading technology, but obtaining pressures above 400 GPa using traditional diamond anvil cell (DAC) still faces significant challenges. Previous experimental studies have shown that the double cup-shaped deformation of diamond is a limiting factor for achieving a pressure of 400 GPa based on traditional DAC. Developing new ultra-high voltage loading technology is an effective way to solve the urgent problems in this field. At present, a two-stage DAC (ds DAC) using nanocrystalline diamond (NCD) hemisphere as the secondary anvil can achieve a pressure of 1 TPA. However, the complex experimental operation difficulty of ds DAC and the extreme size and shape of the NCD hemisphere limit its further application in sample loading and in-situ measurement. In 2018, the Dewaele and Jenei teams independently proposed circular diamond anvil cell (t-DAC) models for achieving pressures above 500 GPa, but subsequent experiments failed to break through the pressure limit of 500 GPa. At present, the design parameters and stress distribution pattern of t-DAC are still unclear, so it is avgörande för att avslöja sin anvilyttrycksfördelning och deformationsmekanism under ultimat tryck .

 

Forskningsteamet utvidgade den isotermiska tillståndsekvationen av volfram (W) metall till den nuvarande posten av 527 GPA extremt högtryck baserat på guldekvationen för tillstånd (EOS) erhållen från synchrotronstrålning röntgendiffraktionsexperiment som använder förbättrade annulära diamant Anvil-celler (Mt DAC) crystal structure of tungsten still maintains its body centered cubic (bcc) structure and no phase transition occurs. By adopting an improved annular machining process to optimize the force distribution of mt DAC, the traditional DAC's pressure limit of 400 GPa has been successfully exceeded, achieving ultra-high pressures above 500 GPa. Finite element analysis shows that Boehler Almax Typ MT DAC har extremt låg maximal ekvivalent spänning och maximal huvudstam, vilket är avgörande för att förbättra tryckgränsen . Detta forskningsresultat kommer att ge viktig referens för att utöka tryckbelastningstekniken och kalibrera experimentellt tryck under extrema förhållanden .}}

 

The first author of the article is Ding Yingji, a doctoral student at the National Key Laboratory of High Voltage and Superhard Materials, Jilin University. The corresponding authors are Professor Huang Xiaoli and Associate Professor Jiang Shuqing from the School of Physics, Jilin University, and Professor Cui Tian from Ningbo University. This study received funding from the National Key Research och utvecklingsprogram för unga forskare samt starkt stöd från Shanghai Synchrotron -strålningskälla och den franska ESRF -källan .

 

Fullt textlänk för papperet:

https: // Journals . APS . org/prb/pdf/10.1103/physrevb .111.214101