Synthesis and transport properties of SrTiO_3−xN_y/SrTiO_3−δlayered structures produced by microwave-induced plasma nitridation

Abstract

SrTiO 3−x N y /SrTiO 3−δ layered structures were synthesized from single crystals of SrTiO 3 (1 0 0) by ammonolysis using a microwave-induced plasma (MIP). Samples prepared using a low ammonia flow rate (50-100 mL min −1) gave nanocrystals of TiN at the surface, while the samples prepared in an ammonia flow in the range 125-175 mL min −1 did not show impurity phases. Electrical resistance measurements of SrTiO 3−x N y /SrTiO 3−δ single crystals show metallic-like behaviour in the temperature range 2-300 K, with a residual resistance ratio R(300 K)/R(4.2 K) of ca 50. The Hall mobility follows the power law µ H ∝ T −2.3 in the temperature range 150-300 K, which is attributed to n-type charge carriers.

Modification of SrTiO3 surface by nitrogen ion bombardment for enhanced photocatalysis

“…The N 1s spectrum consists of two components. The predominant one centered at 397.3 eV is attributed to N 3+ ions bonded to Ti or substitutional N ions, and another one centered at 398.9 eV is assigned to N 2− bonded with O [24,25]. No sign of nitrogen was found on untreated STO by XPS.…”

Synthesis, Crystal Structure and Optical Properties of LaNbON2

“…In addition, lanthanide doping into the A-sublattice can cause coupling of electronic conductivity or electrical polarization and magnetism. The resulting magnetoresistance, magneto capacitance and resistance switching effects are attractive for application in new memory devices and sensors [14][15][16]. Further interest in the area of oxynitrides is due to the discovery of large dielectric constants of BaTaO 2 Based on UV/Vis spectroscopic measurements and density functional theory (DFT) calculations for a number of d 0 -perovskite-type oxides (ABO 3 , B = Zr 4+ , Ti 4+ , Ta 5+ , Nb 5+ ) the electronegativity of the B-site cation increases in the following order: Zr 4+ < Ti 4+ ≈ Ta 5+ < Nb 5+ [21].…”

Thickness‐Dependent Strain Evolution of Epitaxial SrTiO3 Thin Films Grown by Ion Beam Sputter Deposition

“…For the XPS Ti 2p spectra, only Ti 4+ 2p 3/2 and Ti 4+ 2p 1/2 peaks were clearly observed on the film surface. However, the shoulder peaks at the lower binding energy corresponding to Ti 3+ 2p 3/2 (458.2 eV) and Ti 3+ 2p 1/2 states (456.4 eV) appeared for the inner film . The presence of Ti 3+ states gives us the evidence that the inner region of STO films was oxygen‐deficient relative to the surface.…”