Ho-kwang (Dave) Mao
Staff Scientist
Office: 
R-127
Phone: 
(202) 478-8960

Ho-kwang Mao's research centers on ultra-high pressure physics, chemistry, material sciences, geophysics, geochemistry and planetary sciences using diamond-anvil cell techniques that he has pioneered. He received a Ph.D. and M.S. from University of Rochester in 1968 and 1966, and a B.S. in geology from National University in Taiwan, China in 1963.

Areas of interest: 

Related News

High Pressure
Washington, DC—In Earth’s interior, water (H2O) plays an important role in rock physics, but geoscientists rarely treat water in its constituent forms, that is as hydrogen plus oxygen. New work from a team led by the Geophysical Laboratory's Dave Mao has identified that hydrogen can escape from the water under conditions found in Earth’s lower mantle leading to a new paradigm in lower mantle chemistry. Their results were published in Proceeding of the National Academic Science, U.S.A.
Materials
Washington, DC— Using laboratory techniques to mimic the conditions found deep inside the Earth, a team of Geophysical Laboratory scientists led by Ho-Kwang “Dave” Mao has identified a form of iron oxide that they believe could explain seismic and geothermal signatures in the deep mantle. Their work is published in Nature.
High Pressure
Washington, DC—Colossal magnetoresistance is a property with practical applications in a wide array of electronic tools including magnetic sensors and magnetic RAM.
High Pressure
Washington, DC— A Carnegie-led team was able to discover five new forms of silica under extreme pressures at room temperature. Their findings are published by Nature Communications.
High Pressure
Washington, DC—Breaking research news from a team of scientists led by Carnegie’s Ho-kwang “Dave” Mao reveals that the composition of the Earth’s lower mantle may be significantly different than previously thought. These results are to be published by Science.
High Pressure
Washington, DC, 19 June 2013--Using novel high-pressure x-ray techniques, Geophysical Laboratory scientists Li Zhang, Yue Meng (HPCAT), Wenge Yang (HPSync), and Ho-kwang Mao, along with CDAC Partner Wendy Mao (Stanford) and colleagues from the University of Chicago have obtained the very first single-crystal structure of (Mg,Fe)SiO3 postperovskite phase under high pressure corresponding to the condition in the Earth’s D′′ layer.
High Pressure
Washington, DC — When materials are stressed, they eventually change shape. Initially these changes are elastic, and reverse when the stress is relieved. When the material’s strength is exceeded, the changes become permanent.
High Pressure
Washington, DC — Superconductivity is a rare physical state in which matter is able to conduct electricity—maintain a flow of electrons—without any resistance.
High Pressure
Washington, DC — Carbon is the fourth-most-abundant element in the universe and takes on a wide variety of forms, called allotropes, including diamond and graphite.
High Pressure
Washington, DC—Glasses differ from crystals. Crystals are organized in repeating patterns that extend in every direction. Glasses lack this strict organization, but do sometimes demonstrate order among neighboring atoms.

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