Conductivity of SrTiO3 based oxides in the reducing atmosphere at high temperature

Electrical and structural properties of Nb-doped SrTiO3 ceramics

“…It was observed that a maximum value of the unit cell parameter occurs for x=0.02. We think that for a small niobium Hashimoto suggests [8] that reactions (2) and (3) take place even in air. The presence of Ti 3+ and Nb 4+ products of (2) and (3) reactions, as a result of their ionic radius, cause the increase of unit cell parameter.…”

“…Its total electrical conductivity can be increased by doping a rare earth element into the A sublattice or a transition metal into the B sublattice [8][9][10]. Doped strontium titanates have been investigated since early 1980's, although most of the oldest works deal with the lanthanum doping [11][12][13][14][15].…”

“…Doped strontium titanates have been investigated since early 1980's, although most of the oldest works deal with the lanthanum doping [11][12][13][14][15]. Later, the yttrium addition to the pure strontium titanate and the deficiency on the strontium site has been examined [7,8,16,17]. Recently, the attention has been paid again to the niobium doping into the B sublattice [18][19][20][21], where Nb 5+ substitutes Ti 4+ , bringing more oxide ions or more electrons into the system.…”

“…Recently, the attention has been paid again to the niobium doping into the B sublattice [18][19][20][21], where Nb 5+ substitutes Ti 4+ , bringing more oxide ions or more electrons into the system. Niobium-doped samples have several significantly improved properties [8,16,[18][19][20], depending on where the oxygen incorporates in the structure and to which extent the extra charge of Nb 5+ is compensated. Either the cation vacancies are created in order to fulfill the electroneutrality condition or there must be excessive oxygen ions occupying the interstitial oxygen positions in perovskites.…”

Electrical properties of Y0.08Sr0.92Ti0.92Nb0.08 O3−δ after reduction in different reducing conditions

“…Conductivity of SrTiO 3 based oxides can be increased by doping a rare earth element into sublattice A or a transition metal into sublattice B [9]. For example, the Y x Sr 1−x TiO 3 (0 < x < 0.1) compound was reported as a prospective anode material for SOFCs [3,[10][11][12][13].…”