Thermal Equation of State of Rhenium Diboride by High Pressure-Temperature Synchrotron X-ray Studies

Journal Article · Tue Jan 01 04:00:00 EST 2008 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.78.224106· OSTI ID:980653

Wang, Y; Zhang, J; Daemen, L; Lin, Z; Zhao, Y; Wang, L

The unit-cell volume of rhenium diboride (ReB{sub 2}) has been measured by synchrotron X-ray diffraction at pressures and temperatures of up to 7.5 GPa and 1100 K with a cubic anvil apparatus. From the pressure (P)-volume (V)-temperature (T) measurements, thermoelastic parameters were derived for ReB2 based on a modified high-T Birch-Murnaghan equation of state and a thermal-pressure approach. With the pressure derivative of the bulk modulus, K{sub O{prime}}, fixed at 4.0, we obtain: the ambient bulk modulus K{sub O}=334(23)GPa, temperature derivative of bulk modulus at constant pressure ({delta}K/{delta}T){sub P}=0.064(6)GPaK{sup -1}, volumetric thermal expansivity {alpha}{sub T}(K{sup -1})=a+bT with a=1.33(25)x10{sup -5}K{sup -1} and b=1.48(64)x10 8K 2, pressure derivative of thermal expansion ({delta}{alpha}/{delta}P){sub T}=5.76(95)x10{sup -7}GPa{sup -1}K{sup -1}and temperature derivative of bulk modulus at constant volume ({delta}K/{delta}T){sub v}=0.049(11) GPaK{sup -1}. The ambient bulk modulus derived from this work is comparable to previous experimental and theoretical results. These results, including the ambient bulk modulus and other thermoelastic parameters determined in present study, extend our knowledge of the fundamental thermophysical properties on ReB{sub 2} and are important to the development of theoretical and computational modelings of hard materials.

• Research Organization: Brookhaven National Laboratory (BNL) National Synchrotron Light Source
• Sponsoring Organization: Doe - Office Of Science
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 980653
• Report Number(s): BNL--93571-2010-JA
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 22 Vol. 78; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
EQUATIONS
EQUIPMENT
MATERIALS
RHENIUM
SYNCHROTRONS
THERMAL EXPANSION
VOLUME
X-RAY DIFFRACTION
national synchrotron light source