This article is cited in 29 papers

Transport and optical properties of iron borate FeBO$_3$ under high pressures

I. A. Trojan^a, M. I. Eremets^b, A. G. Gavriliuk^a, I. S. Lyubutin^c, V. A. Sarkisyan<sup>c

a</sup> Institute for High Pressure Physics, Russian Academy of Sciences
^b Max Planck Institute for Chemistry, Mainz
^c Institute of Cristallography Russian Academy of Sciences, Moscow

Abstract: The optical absorption spectra of iron borate FeBO$_3$ were measured in diamond anvil cells at high pressures up to $P=82\,$GPa. The electronic transition with an abrupt jump in the absorption edge from $\sim 3$ to $0.8\,$eV was observed at $P\approx 46\,$GPa. The resistance and its temperature dependence were directly measured for FeBO$_3$ at high pressures up to $140\,$GPa. It was established that the electronic transition at $P\approx 46\,$GPa was accompanied by the insulator-semiconductor transition. In the high-pressure phase, the thermoactivation gap decreases smoothly at $46<P<140\,$GPa approximately from $0.55$ to $0.2\,$eV following the linear law. The extrapolated value of the pressure at which the sample becomes fully metallic is equal to about $210\,$GPa.

PACS: 71.27.+a, 71.30.+h, 81.40.-z

Received: 21.05.2003

 English version: Journal of Experimental and Theoretical Physics Letters, 2003, 78:1, 13–16

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