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Who first exceeded 100 gigapascals using a diamond-anvil cell?

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The 100 gigapascal (GPa) mark was first surpassed using a diamond-anvil cell in December 1975. This milestone was achieved by geophysicists Ho-kwang Mao and Peter M. Bell, who were affiliated with the Geophysical Laboratory of the Carnegie Institution of Washington. Following this achievement, they were able to reach pressures of approximately 300 GPa using the same apparatus.1