Since the positive influences of defects on the performance of electroceramics were discovered, investigations concerning on defects and aliovalent doping routes have grown rapidly in the fields of inorganic chemistry and condensed matter physics. In this article, we summarized the types of defects in electroceramics as well as characterization tools of defects and highlighted the effects of intrinsic and extrinsic defects on the material performances with the emphasis on dielectric, ferroelectric, and piezoelectric properties. We mainly introduced defect related theoretical simulation and experimental results in several typical incipient ferroelectrics, ferroelectrics, and antiferroelectrics. Hence, the influences of defects on the crystal lattice were summed up, and then the main physical mechanisms were highlighted. Particularly, the performance enhancements of aliovalently doped electroceramics were also evaluated and reviewed. Finally, the outlook and challenges were discussed on the basis of their current developments. This article covers not only an overview of the state-of-the-art advances of defects and aliovalent doping routes in electroceramics but also the future prospects that may open another window to tune the electrical performance of electroceramics via intentionally introducing certain defects.

Defects and Aliovalent Doping Engineering in Electroceramics.

Structural and luminescence behavior of Sm3+ ions doped lead boro-telluro-phosphate glasses

3D-Ising ferromagnetic characteristics and magnetocaloric study in Pr0.4Eu0.2Sr0.4MnO3 manganite

Synthesis and characterization of thermoluminescent Li2B4O7 nanophosphor

Thermoluminescence studies on Cu-doped Li2B4O7 single crystals

Judd–Ofelt analysis of spectroscopic properties of Sm3+ ions in K2YF5 crystal

Critical behavior of Y-doped Nd0.7Sr0.3MnO3 manganites exhibiting the tricritical point and large magnetocaloric effect

We report the results of magnetic, X-ray powder diffraction, infrared and temperature dependent Raman spectra of the La0.8Sr
 x
 Ca0.2-x
 MnO3 (0 ≤ x ≤ 0.2) manganite. The structure refinement using the Rietveld method indicates that the partial substitution of strontium for calcium (for x ≥ 0.15) modifies the orthorhombic structure of the CaMnO3 perovskite towards a rhombohedral phase. Magnetic measurement confirms the increase in the Curie temperature from 180 K for La0.8Ca0.2MnO3 to 307 K for La0.8Sr0.2MnO3, respectively. It is argued that the substitution with the larger Sr2+ ion strengthens the double-exchange interaction and gives rise to the observed increase of transition temperatures. All manganites show two IR active vibrational modes around 400 and 600 cm−1. Moreover, when x ≤ 0.1, the absorption band around 400 cm−1 splits into two peaks. In addition, we have analyzed the frequencies and widths of the observed Raman modes as a function of temperature for all samples with various Sr content. The mode splitting is attributed to both magnetic ordering and large orthorhombic distortion in doped rhombohedral manganites.

Structural, magnetic, infrared and Raman studies of La 0.8 Sr x Ca 0.2- x MnO 3 (0 ≤ x ≤ 0.2)

Effect of doping on the luminescence properties of Li2B4O7

Magnetic visible-light activated photocatalyst ZnFe2O4/BiVO4/g-C3N4 for decomposition of antibiotic lomefloxacin: Photocatalytic mechanism, degradation pathway, and toxicity assessment.

B.T. Huy

Papers

Judd–Ofelt analysis of spectroscopic properties of Sm3+ ions in K2YF5 crystal

Critical behavior of Y-doped Nd0.7Sr0.3MnO3 manganites exhibiting the tricritical point and large magnetocaloric effect

Structural, magnetic, infrared and Raman studies of La 0.8 Sr x Ca 0.2- x MnO 3 (0 ≤ x ≤ 0.2)

Effect of doping on the luminescence properties of Li2B4O7

Magnetic visible-light activated photocatalyst ZnFe2O4/BiVO4/g-C3N4 for decomposition of antibiotic lomefloxacin: Photocatalytic mechanism, degradation pathway, and toxicity assessment.