High-pressure equation of state properties of bismuth oxide

Abstract

The high pressure equation of state response of hot pressed bismuth trioxide (Bi2O3) powder compacts is determined through a series of parallel plate impact gas-gun experiments. Loose powders of Bi2O3 are hot-pressed to an average density of 9.202 g/cm3, corresponding to 96% theoretical maximum density. Shock compaction of the compacts to pressures between 4-17 GPa reveal full consolidation occurring at pressures above ∼ 8 GPa. Using the experimentally determined Hugoniot of the 96% dense compact, calculations are performed to obtain the equation of state parameters for solid density Bi2O3.

Structural study of α-Bi2O3under pressure

“…We report the EOS of the monoclinic phase in both synthetic and mineral samples and compare it with that recently obtained [16] and with our theoretical calculations. The purpose of our study is to understand the structural behavior of -Bi 2 O 3 at high pressures in order to compare it with that of other V-group sesquioxides, like …”

“…The equation of state of both HP and HPC phases also were determined [12].However, scarce information is known about -Bi 2 O 3 at high pressures despite its industrial interest. Only a high-pressure Raman study of -Bi 2 O 3 proposed its amorphisation above 20 GPa [15], and the equation of state (EOS) of synthetic -Bi 2 O 3 was recently studied using shock waves [16].…”

Elastic and thermodynamic properties of α-Bi2O3 at high pressures: Study of mechanical and dynamical stability

“…The structural, vibrational, optical, electric and magnetic properties of -Bi 2 O 3 have been studied under different conditions of temperature or pressure [1,[8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. These studies report that this material has unusual magnetic and electrical properties such as the existence of internal magnetic fields and a longitudinal magnetoelectric effect [9,10].…”

“…These studies report that this material has unusual magnetic and electrical properties such as the existence of internal magnetic fields and a longitudinal magnetoelectric effect [9,10]. In addition, shock compression experiments have demonstrated that bismite can be used as thermite mixtures for high pressure (HP) applications [8]. In this context, powder X-ray diffraction and Raman scattering experiments have shown that -Bi 2 O 3 undergoes an amorphization at HP between 15 and 20 GPa depending on the hydrostatic conditions [16,22,23].…”

Laser photochemical deposition of magnetite nanograins in a-Fe/C/O composite: High-pressure metal oxide polymorph surviving ambient conditions

“…High-pressure studies of metal oxides have been given continuous attention leading to discoveries of unusual crystal and electronic structures and dielectric, magnetic and elastic properties not observed at ambient conditions [1][2][3][4][5][6][7][8][9][10][11][12]. Among these substances, the high-pressure form of magnetite (h-Fe 3 O 4 ), described as orthorhombic CaTi 2 O 4 -type structure [13,14], is an important counterpart to the face-centered cubic magnetite (fcc-Fe 3 O 4 ) observed at ambient pressure [15] and above Verwey metalinsulator phase transition (121 K) [16].…”