Pressure-induced high-spin/low-spin disproportionated state in the Mott insulator FeBO.

The pressure-induced Mott insulator-to-metal transitions are often accompanied by a collapse of magnetic interactions associated with delocalization of 3d electrons and high-spin to low-spin (HS-LS) state transition. Here, we address a long-standing controversy regarding the high-pressure behavior of an archetypal Mott insulator FeBO and show the insufficiency of a standard theoretical approach assuming a conventional HS-LS transition for the description of the electronic properties of the Mott insulators at high pressures. Using high-resolution x-ray diffraction measurements supplemented by Mössbauer spectroscopy up to pressures ~ 150 GPa, we document an unusual electronic state characterized by a "mixed" HS/LS state with a stable abundance ratio realized in the [Formula: see text] crystal structure with a single Fe site within a wide pressure range of ~ 50-106 GPa.

Verwey-Type Charge Ordering and Site-Selective Mott Transition in FeO under Pressure.

The metal-insulator transition driven by electronic correlations is one of the most fundamental concepts in condensed matter. In mixed-valence compounds, this transition is often accompanied by charge ordering (CO), resulting in the emergence of complex phases and unusual behaviors. The famous example is the archetypal mixed-valence mineral magnetite, FeO, exhibiting a complex charge-ordering below the Verwey transition, whose nature has been a subject of long-time debates.

[Interferonogenic activity of the strain BH-3 duck hepatitis virus type I ()].

Introduction: Duck viral hepatitis type I (DVH-I) is a poorly studied contagious disease caused by RNA-containing duck (Anatinae) hepatitis virus type I (Picornaviridae: Avihepatovirus: Avihepatovirus A). This infection is widespread in many countries, including Russia, and causes significant damage to industrial duck breeding. The study of interferonogenic activity of its etiologic agent strains is of great importance in solving the problem of developing effective means to control the disease.

Revealing the Complex Nature of Bonding in the Binary High-Pressure Compound FeO_{2}.

Extreme pressures and temperatures are known to drastically affect the chemistry of iron oxides, resulting in numerous compounds forming homologous series nFeOmFe_{2}O_{3} and the appearance of FeO_{2}. Here, based on the results of in situ single-crystal x-ray diffraction, Mössbauer spectroscopy, x-ray absorption spectroscopy, and density-functional theory+dynamical mean-field theory calculations, we demonstrate that iron in high-pressure cubic FeO_{2} and isostructural FeO_{2}H_{0.5} is ferric (Fe^{3+}), and oxygen has a formal valence less than 2.

THE KINETICS OF THE INACTIVATION OF THE HEPATITIS VIRUS TYPE I (AVIHEPATOVIRUS, PICORNAVIRIDAE).

Experimental data on the kinetics of the inactivation of the vaccine strain of the duckling hepatitis virus of the type I with increased temperature and aminoethyl ethylenimine are presented. It was shown that the vaccine strain 3M-UNIIP of the hepatitis virus of ducklings of type I was comparatively thermostable at 56°C and sensitive to the action of aminoethyl ethylenimine; the time of complete inactivation of the virus at a final concentration of 0.1% at 37°C was 24 h.