SrTiO3-based thermoelectrics: Progress and challenges

Although SrTiO3-based perovskites showed a lot of promise as n-type thermoelectric (TE) materials, they demonstrated a low figure of merit value primarily because of their high lattice thermal cond...

High-Entropy Perovskites: An Emergent Class of Oxide Thermoelectrics with Ultralow Thermal Conductivity

Enhanced thermoelectric properties of vanadium doped SrTiO3: A resonant dopant approach

Electronic structure engineering of SrTiO3 via rhodium doping: A DFT study

High-entropy MTiO3 perovskite oxides with glass-like thermal conductivity for thermoelectric applications

Microstructure and properties of La2O3-doped tungsten-based bulk material and its densification mechanism during spark plasma sintering process

In this study, from the viewpoint of reducing the weight of a steel/steel composite plate, a ferrite-based low-density steel composite plate composed of A-side with density of about 7.15 g·cm−3 and B-side with density of about 7.10 g·cm−3 was fabricated using electroslag remelting followed by hot forging. The microstructure and properties of the composite plate and its ballistic penetration characteristics were investigated. The microstructures of the A-side and B-side were characterized by crossed-laminated microstructure composed mainly of banded δ-ferrite and α-ferrite distributed between the bands. The content, length, and width of the banded δ-ferrite on the A-side were respectively lower or smaller than those on the B-side. The hardness and compressive strength of the A-side respectively being about 420 ± 6 HV0.5 and 2250 MPa were higher than those of the B-side respectively being about 326 ± 12 HV0.5 and 1808 MPa. The microstructure and composition of the miscibility zone with a thickness of about 45 µm between the A-side and B-sid had no obvious difference with its adjacent side. No intermetallic compounds could be identified in the miscibility zone. The composite plate could resist the vertical ballistic penetration of 7.62 mm-caliber armor piercing incendiary projectile with an initial velocity of about 800 m/s at 50 m from the plate. When ballistic penetration was conducted from the A-side, the projectile could not reach the miscibility zone and the microstructure and fracture characteristics of the projectile hole was dominated by shear bands (SBs) and dimples. When ballistic penetration was conducted from the B-side, the projectile could pass through the miscibility zone and reach A-side but could not penetrate the A-side; and the microstructure and fracture characteristics of the projectile hole was dominated by cracks and local rheological. The main reasons for the different ballistic penetration characteristics near the projectile hole formed by ballistic penetration from A-side and B-side were attributed to the different microstructure and properties between both sides. The crossed-laminated structure in A-side has a positive effect on the anti-penetration properties of the composite plate. 

Investigation on a ferrite-based low-density steel composite plate with crossed-laminated structure and its ballistic penetration characteristics

SrTiO3 is a promising thermoelectric material for high temperature application of waste heat electrical generation. However, its dimensionless figure of merit (zT) is restricted by its high thermal conductivity, which results from the simple perovskite structure and light elements of SrTiO3. In this paper, we successfully obtained complex structured bulk SrTiO3 with a TiO2 second phase and a porous structure by tuning the doping ratios of the heavy elements La and Nb, resulting in a low thermal conductivity of 1.97 W m−1 K−1 and a high zT value of 0.31 at 1050 K. The first-principles calculation was utilized to calculate the formation energy, effective mass and electron band structure of La–Nb co-doped SrTiO3, and the effects of the parameters on the thermoelectric properties were also discussed. We found that the doping ratio of La to Nb changed the electron band structure and controlled the formation of the TiO2 second phase, which affected the electrical transport and thermal transport properties, respectively. The formation of the in situ TiO2 second phase was related to the high formation energy derived from the high Nb concentration. These results offer an approach for the design of other thermoelectric materials with low thermal conductivity and a high power factor.

First-principles calculations and high thermoelectric performance of La–Nb doped SrTiO 3 ceramics

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Papers

Microstructure and properties of La2O3-doped tungsten-based bulk material and its densification mechanism during spark plasma sintering process

Investigation on a ferrite-based low-density steel composite plate with crossed-laminated structure and its ballistic penetration characteristics

First-principles calculations and high thermoelectric performance of La–Nb doped SrTiO 3 ceramics