Effect of calcining temperature on structural and dielectric properties of Li0.30Cr0.02Ni0.68O ceramics

Influence of Cr doping on structure and dielectric properties of LixCryNi1−x−yO ceramics

“…47-1049] without any secondary phases. This is consistent with previous research [21]. The crystallite size (D) was calculated using the Scherrer equation as follows:…”

“…Recently, CaCu 3 Ti 4 O 12 (CCTO) [1][2][3][4][5] and (A, B)-codoped NiO systems with the formula A x B y Ni 1 À x À y O [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] have been actively investigated due to their extraordinarily high dielectric constants (ε r $ 10 4 -10 5 ) with weak temperature and frequency dependence. It has been widely thought that the boundary layer capacitors (BLCs) model is the most likely explanation of their dielectric behavior.…”

“…This is responsible for the high dielectric constant of such material systems, which can be tuned by changing the elements, A and B, in A x B y Ni 1 À x À y O materials. Numerous authors reported tuned compositions of A (i.e., Li [6][7][8][9][10][11][12][13], Na [14], K [19]) and B (i.e., Al [7,17], Si [22], Ti [6,9,10,15,18], W [13], V [13,20], Cr [8,21], Co [11], Zr [12], Fe [16], Pr [23], Ta [24]). NiO is a Mott-Hubbard insulator at room temperature.…”

“…As the result, more charges accumulated at the grain boundary, resulting in its huge dielectric constant. To obtain a huge dielectric constant and a low loss tangent, Cr was used as a dopant in LiNiO lattice with the stoichiometry of Li 0.30 Cr 0.02 -Ni 0.68 O as reported by our group [8,21]. Huge dielectric constants (ε r $ 10 4 -10 5 ) were observed in these materials.…”

Electric Conduction Mechanisms Study within Zr Doped Mn3O4 Hausmannite Thin Films through an Oxidation Process in Air

“…No other experimental method provides a comparable dynamics resolution. In transition metal oxides and their mixed systems, the electrical conduction has been studied extensively due to its incompletely filled 3d shell (Alonso-Domínguez et al, 2016;Baghizadeh et al, 2015;Biju & Khadar, 2003;Boukhachem et al, 2016;Dridi et al, 2015;Khumpaitool & Khemprasit, 2014;Rouahi et al, 2016;Wypych et al, 2014). Among these metal oxides family, hausmannite Mn 3 O 4 has attracted much interest due to its typical intrinsic p-type conductivity (Bose & Biju, 2015aLarbi et al, 2014;Ulutas et al, 2016).…”