Reinhard Boehler

from Wikipedia, the free encyclopedia

Reinhard Boehler , also Böhler, (* 1947 ) is a German geophysicist and mineralogist.

Boehler studied at the University of Tübingen with an intermediate diploma in physics and chemistry in 1968, a diploma in mineralogy in 1970 and a doctorate in 1974. As a post-doctoral student he was at GC Kennedy at the Institute of Geophysics and Planetary Physics (IGPP) at the University of California, Los Angeles , where he became Assistant Research Geophysicist and Head of the High Pressure Laboratory.

From 1986 he was at the Max Planck Institute for Chemistry in Mainz (working group high pressure mineral physics) as head of the high pressure research group and he became director there. In 2012, he joined the Carnegie Institution's Geophysics Laboratory in Washington, DC as a Senior Scientist

At the MPI in Mainz, he headed the high pressure laboratory and researched the (thermal) behavior of materials in the deep mantle and core (especially iron) at very high pressures (adiabatic temperature gradient , Grüneisen parameters , thermal expansion coefficients ). He developed new high-pressure techniques ( diamond stamp cells heated with lasers ) and carried out the first high-pressure experiments at temperatures above 4000 Kelvin and the first iron melting experiments under conditions like those in the earth's core (pressures up to 2 megabars and temperatures above 5000 degrees Celsius). Among other things, he found a very high melting point for perovskite (a main component of the lower earth's mantle) under pressure conditions at the boundary between the earth's mantle and core. Experiments by him and L. Chudinovskikh in 2001 provided an explanation for the 660 km discontinuity in the lower mantle.

In 1993 he determined the temperature at the transition to the inner solid core of the earth at around 4850 degrees Celsius. Since there the inner solid core merges into the outer liquid core, this corresponds to the melting point of iron at these pressures. In 2013, French scientists corrected Agnès Dewaele's (the melting point is 1000 degrees higher at around 6000 degrees Celsius), and they also found that the results from 1993 were probably due to the observation of a recrystallization process that was wrongly interpreted as melting.

In 1997 he received the Louis Néel Medal and in 2005 the Schlumberger Award from the Mineralogical Society of Great Britain and Ireland .

He is President of the International Association for the Advancement of High Pressure Science and Technology (AIRAPT).

Fonts

  • with M. Ross, P. Söderlind, DB Boercker: High-pressure melting curves of Argon, Krypton, and Xenon: Deviation from corresponding states theory , Physical Review Letters 86, 5731-5734 (2001).
  • with L. Chudinovskikh: High-pressure polymorphs of olivine and the 660-km seismic discontinuity , Letters of Nature 411, 574-577 (2001), PMID 11385569
  • with D. Errandonea, B. Schwager, R. Ditz, Ch. Gessmann, M. Ross: Systematics of transition-metal melting , Physical Review B 63, 132104 (2001).
  • Temperatures in the Earth's core from melting point measurements of iron at high static pressure , Nature 363, 1993, 534-536
  • High pressure experiments and the phase diagram of lower mantle and core materials , Reviews of Geophysics, 38, 2000, 221–245
  • Melting temperature of the earth's mantle and core , Annual Review of Earth and Planetary Science, 24, 1996, 15-40
  • Melting of mantle and core materials at very high pressures , Philosophical Transactions Royal Society, A 354, 1996, 1256-1278

Web links

Individual evidence

  1. ↑ Topic of the dissertation: Direct determination of the phase boundary quartz-coesite in the temperature range 800 - 1100 ° C. : Compressibility and thermal expansion of [alpha] quartz at pressures up to 50 kbar and temperatures up to 1000 ° C
  2. ↑ Boehler Temperatures in the Earth's core from melting-point measurements of iron at high static pressures , Nature 363, 1993, 534-536. Measured values ​​in the 1 Mbar range were extrapolated to 3.3 Mbar at the border to the inner core.
  3. ↑ Center of the earth: a thousand degrees hotter than previously measured Pro Physik, April 26, 2013
  4. ↑ Laudatory speech
  5. ^ Schlumberger Award
personal data
SURNAME Boehler, Reinhard
BRIEF DESCRIPTION German geophysicist and mineralogist
DATE OF BIRTH 1947