DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: High-pressure phase transitions and melt structure of Pb O 2 : An analog for silica

Journal Article · · Physical Review. B
ORCiD logo [1];  [2]; ORCiD logo [3];  [2]
  1. Univ. of California, Santa Cruz, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); University of California, Berkeley
  2. Univ. of California, Berkeley, CA (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

In situ x-ray diffraction measurements and inverse Monte Carlo simulations of pair distribution functions were used to study the structural response of PbO2 under pressure and to characterize the local structure of liquid PbO2. Two phase transitions are observed upon room-temperature compression of crystalline PbO2 up to ~65 GPa. Here, the starting mixture of rutile structured β– PbO2 and orthorhombic α– PbO2 undergoes a transition to a ZrO2-type orthorhombic phase with space group Pbca at ~21 GPa. Above 42 GPa, the Pbca phase transforms to a cotunnite-type phase with space group Pnam. In this paper, we also report short-range order in liquid PbO2, showing ~8–9-fold and 4–5-fold coordination around Pb and O atoms, respectively.

Research Organization:
Univ. of California, Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231; NA0004032
OSTI ID:
1875285
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 6 Vol. 105; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

References (37)

The high-pressure phase transformations of PbO2: An in-situ X-ray diffraction study journal September 1980
Ab initio two-phase molecular dynamics on the melting curve of SiO2 journal October 2010
Empirical potential Monte Carlo simulation of fluid structure journal January 1996
High pressure induced phase transformation of SiO2 and GeO2: difference and similarity journal August 2004
Calibration of the ruby pressure gauge to 800 kbar under quasi-hydrostatic conditions journal January 1986
Local structure of molten AuGa2 under pressure: Evidence for coordination change and planetary implications journal May 2018
Ten-fold coordinated polymorph and metallization of TiO 2 under high pressure journal January 2015
Lone-pair distribution and plumbite network formation in high lead silicate glass, 80PbO·20SiO2 journal January 2013
High-pressure phase transitions in SnO2 journal April 2005
Determination of the variation of the fluorescence line positions of ruby, strontium tetraborate, alexandrite, and samarium-doped yttrium aluminum garnet with pressure and temperature journal July 2011
Prediction of a hexagonal SiO2 phase affecting stabilities of MgSiO3 and CaSiO3 at multimegabar pressures journal January 2011
Prevalence of Earth-size planets orbiting Sun-like stars journal November 2013
Prediction of 10-fold coordinated TiO 2 and SiO 2 structures at multimegabar pressures journal May 2015
DIOPTAS : a program for reduction of two-dimensional X-ray diffraction data and data exploration journal May 2015
On the uniqueness of structure extracted from diffraction experiments on liquids and glasses journal September 2007
The high-pressure phase transition sequence from the rutile-type through to the cotunnite-type structure in journal March 1996
Optical-absorption edge of CsI up to 58 GPa journal August 1984
X-ray diffraction study of the phase transitions and structural evolution of tin dioxide at high pressure:ffRelationships between structure types and implications for other rutile-type dioxides journal May 1997
Transition to a crystalline high-pressure phase in α − GeO 2 at room temperature journal April 2000
Ab initio studies of high-pressure transformations in GeO 2 journal March 2001
High-pressure form of pyrite-type germanium dioxide journal July 2003
Structural stability of silica at high pressures and temperatures journal February 2005
Partial structure factors from disordered materials diffraction data: An approach using empirical potential structure refinement journal September 2005
High-pressure phases in SnO 2 to 117 GPa journal January 2006
High-pressure behavior of TiO 2 as determined by experiment and theory journal April 2009
Identification of post-pyrite phase transitions in SiO 2 by a genetic algorithm journal May 2011
Melting and metallization of silica in the cores of gas giants, ice giants, and super Earths journal July 2015
Theoretical and Experimental Evidence for a New Post-Cotunnite Phase of Titanium Dioxide with Significant Optical Absorption journal July 2011
Experimental and Theoretical Identification of a New High-Pressure TiO 2 Polymorph journal December 2001
A beamline for high-pressure studies at the Advanced Light Source with a superconducting bending magnet as the source journal August 2005
FIT2D : a multi-purpose data reduction, analysis and visualization program journal March 2016
High-Pressure-High-Temperature Polymorphism of the Oxides of Lead journal April 1961
The Pyrite-Type High-Pressure Form of Silica journal August 2005
Dissociation of MgSiO3 in the Cores of Gas Giants and Terrestrial Exoplanets journal February 2006
Shock compression of stishovite and melting of silica at planetary interior conditions journal January 2015
Crystal structure and compressibility of lead dioxide up to 140 GPa journal January 2014
Structural analysis of orthorhombic ZrO2 by high resolution neutron powder diffraction.
  • Ohtaka, Osamu; Yamanaka, Takamitsu; Kume, Shoichi
  • Proceedings of the Japan Academy. Ser. B: Physical and Biological Sciences, Vol. 66, Issue 10 https://doi.org/10.2183/pjab.66.193
journal January 1990