Infrared dielectric response of BaTaO2N

Combined experimental and theoretical assessments of the lattice dynamics and optoelectronics of TaON and Ta3N5

“…This modification introduces outstanding characteristic of hardness, which leads to high chemical and thermal stability as well as mechanical durability [1][2][3][4]. Straightforwardly, replacement of oxygen atoms with nitrogen atoms also changes the optical properties, which potentially enables the utilization of metal nitrides and oxynitrides as safe pigment materials to replace toxic metal-containing pigment materials [5][6][7][8][9]. Considering that the oxygen replacement with nitrogen results in bandgap reduction, additional interest in metal nitrides and oxynitrides fuels their development as visible light-responsive photocatalysts [10][11][12].…”

First‐principles and molecular‐dynamics study of structure and bonding in perovskite‐type oxynitrides ABO2N (A = Ca, Sr, Ba; B = Ta, Nb)

“…Among these, alkalineearth-based transition-metal oxynitrides such as ABO 2 N belong to a family of compounds which often adopt the BaTiO 3 perovskite (or perovskite-like) structure in which three O 2− ions are replaced by two O 2− and one N 3− ions such that the increased anionic charge must be compensated by exchanging Ti 4+ against either Ta 5+ or Nb 5+ . Fortunate enough, these slightly more complex phases offer a variety of novel physical phenomena 1 due to their remarkable optical 2 and dielectric properties 3 as well as their potential for applications in catalysis 4 and ionic conduction. 5 The phase BaTaO 2 N was first synthesized by Marchand et al, 6 and the structure was determined as being the cubic perovskite type (space group Pm3m, no.…”

Processing of dielectric oxynitride perovskites for powders, ceramics, compacts and thin films

“…200 was observed for BaTaO 2 N thin films 36 (which will be discussed later in the thin-film section). In addition, a comparison between BaTaO 2 N and BaTiO 3 was conducted using infrared reflection spectroscopy and the dielectric response of BaTaO 2 N was found not to reach very high values 7 . The high dielectric permittivity of BaTaO 2 N and SrTaO 2 N should be carefully studied using dense samples produced by other shaping methods, such as conventional pressureless sintering or thin-film growth.…”

“…Nonstoichiometry was introduced into oxynitride perovskites, which resulted in notable electronic transport properties, such as thermoelectricity in SrMoO 2-x N 1+x , and colossal magnetoresistance in EuNbO 2+x N 1-x and EuWO 1+x N 2-x 6 . The dielectric response of BaTaO 2 N was first deduced from the infrared reflection spectra of a pelletized polycrystalline sample 7 . Relatively large dielectric constants have also been reported for oxynitride perovskites, especially ATaO 2 N, where A = Ba, Sr 8 .…”