Dense Sm and Mn Co-Doped BaTiO3 Ceramics with High Permittivity

Abstract

The structure, valence state, and dielectric properties of (Ba1−xSmx)(Ti0.99Mn0.01)O3 (BSTM) (x = 0.02‒0.07) ceramics prepared via a high temperature (1400 °C/12 h) solid state reaction were investigated. A homogeneous and dense microstructure was observed in all samples. With increasing Sm content, the crystal structure changed from tetragonal (x ≤ 0.06) to cubic (x = 0.07) and unit cell volume (V0) decreased continuously, which was mainly due to the substitution of Ba2+ ions by smaller Sm3+ ions in the perovskite lattice. Electron paramagnetic resonance investigation revealed that Mn ions were reduced from high valence to low valence under the role of Sm3+ donor, and only Mn2+ ions were observed at x = 0.07. The Curie temperature (Tc) moved to lower values, from 105.5 down to 20.4 °C, and the x = 0.07 sample satisfied Y5V specification with high permittivity (ε′RT > 13,000) and low loss (tan δ < 0.03).

Multifunctional barium titanate ceramics via chemical modification tuning phase structure

“…Another situation is when the mixed peak drops below RT , a rapid decrease in ε r at RT will occur, such as A‐site Sr 2+ and some rare earth ions (eg, Sm 3+ ), B‐site Zr 4+ , Hf 4+ or Sn 4+ , and other substitutions with similar effect. The only distinction is the difference on their doping content, as displayed Figure 12A‐C 54,56,59,61,63,70,153,157,163,207‐209 . Dielectric capacitors based on BT‐based ceramics (eg, X7R, X8R, X9R) require high ε r with excellent temperature and frequency stabilities.…”

“…A‐C, Evolution of room‐temperature ε r for cations doped BT ceramics 54,56,59,61,63,70,153,157,163,207‐209 . D, ε r ‐ T curves for oxides doped BT ceramics 210 .…”

Characterization and Physical Properties of Ba0.9Sb0.1TiO3 Solid Solution

“…Therefore, optimal addition of Sb 3+ to pure BT is considered to reduce the local disorder around the Ba 2+ atom and also affects the local structure of Ti 4 + [4]. have been actively studied by many researchers in the synthesis of BT substitutes for A and B sites [8,9].…”

Dielectric Properties in Transition Metal and Rare‐Earth‐Doped Multiferroic BaTiO3 Nanoparticles

“…It must be mentioned that there are also compounds where the peak value of the DC ϵ 0 increases, but the ferroelectric transition temperature T C decreases (e.g., by Cu or Sm doping [35,65,66] ) or vice versa-ϵ 0 decreases, whereas T C increases (e.g., by Nb doping [67] ). May be there is a combination, a competition between tensile and compressive strains.…”