Electronic conduction in quenched ceramic samples of highly reduced lanthanum doped SrTiO3

Odekirk, B.; Balachandran, U.; Eror, N. G.; Blakemore, J. S.

doi:10.1016/0025-5408(82)90146-5

Cited by 28 publications

(13 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Low calcination temperatures (973-1173 K in air), respectively, low sintering temperatures of 1623 K were used-resumably leading to oxygen-rich samples 'Sr 1-x La x TiO 3+δ ' (δ > 0). In this report, Ruddlesden-Popper phase model, which is represented as 'xSrO·2Sr 1-3x/2 La x TiO 3 ', was proposed, and some articles described the supporting data for this model [6,[13][14][15], although detecting the phase by XRD is very difficult. In this phase, without the reduction of Ti, the A-site vacancy in the perovskite-structured part 'Sr 1-3x/2 La x TiO 3 ' increases with the increase of La concentration x.…”

Section: Crystal Phase and Lattice Parameter At Room Temperaturementioning

confidence: 97%

See 1 more Smart Citation

A study on the structural and electrical properties of lanthanum-doped strontium titanate prepared in air

Hashimoto

Kindermann

Poulsen

et al. 2005

Journal of Alloys and Compounds

View full text Add to dashboard Cite

Section: Crystal Phase and Lattice Parameter At Room Temperaturementioning

confidence: 97%

“…Donor doping to strontium titanate is widely studied as a means of the conductivity improvement [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. An example is La-doped SrTiO 3 series.…”

Section: Introductionmentioning

confidence: 99%

A study on the structural and electrical properties of lanthanum-doped strontium titanate prepared in air

Hashimoto

Kindermann

Poulsen

et al. 2005

Journal of Alloys and Compounds

View full text Add to dashboard Cite

“…Reduction of Ti introduces electrons into the Ti 3 d orbital involved in the conduction. Donor doping of strontium titanate is also widely studied as a means to improve the conductivity [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. An example is the La doped SrTiO 3 series.…”

Section: Introductionmentioning

confidence: 99%

“…However, Sr 1−x La x TiO 3−α , where α can adopt both positive and negative values, shows a lack of reproducibility of the structure-and conductivity data [4][5][6][7][8][9][10][11][12][13][14][15][16][17]. Howard et al reported that the lattice parameter increased with increasing La concentration "x" in Sr 1−x La x TiO 3−α [8] while Eror et al reported that the lattice parameter decreased with increaseing "x" [9,10].…”

Section: Introductionmentioning

confidence: 99%

Conductivity and expansion at high temperature in Sr0.7La0.3TiO3−α prepared under reducing atmosphere

et al. 2006

View full text Add to dashboard Cite

Sr 0.7 La 0.3 TiO 3−α specimens were prepared in reducing atmosphere, and the structural and electrical properties were studied. The lattice parameter of Sr 0.7 La 0.3 TiO 3−α at room temperature was larger than that expected from Vegard's law between SrTiO 3 and LaTiO 3 due to the reductive expansion. The conductivity of this specimen was 100 S cm −1 at 1000 • C, p O 2 = 10 −13 Pa. However, the conductivity was not preserved after an oxidation-reduction cycle. Over p O 2 = 10 2 Pa, the conductivity drastically dropped with increasing p O 2 . The thermal expansion coefficient of Sr 0.7 La 0.3 TiO 3−α was 11.8 × 10 −6 K −1 in 9% H 2 /N 2 (room temperature -1000 • C). In this Sr 0.7 La 0.3 TiO 3−α , the chemical expansion on oxidation reached l/l o = 0.51%, when changing p O 2 from 10 −11 Pa to 2 × 10 4 Pa (air) at 1000 • C.

show abstract

“…At the upper end of that Po~ range, the lattice contains excess oxygen, has Sr vacancies in the perovskite cells, and parts of SrO planes interleaving those perovskite units (28). High temperature (27) and low temperature (26) conductivity measurements indicate that this requires Pos -~ 10 -is arm for the 1325 K equilibration. High temperature (27) and low temperature (26) conductivity measurements indicate that this requires Pos -~ 10 -is arm for the 1325 K equilibration.…”

Section: Resultsmentioning

confidence: 99%

Ceramic SrTiO3 Photoanodes: Enhancement of Photoactivity Through Donor Doping

Odekirk¹,

Blakemore²

1983

J. Electrochem. Soc.

Self Cite

View full text Add to dashboard Cite

Results are reported for the photoactivity of lanthanum-doped, strongly reduced SrTiOs in microcrystalline ceramic form. Photoanodes of LaxSr~_~ TiO3 (withx up to 0.01) were used in photoelectrochemical cells with simulated AM2 solar illumination, and aqueous electrolytes of various pH. The photoresponse was highest for strongly basic electrolytes, and 1M NaOH was used for subsequent experiments. Samples with heavy doping and strong reduction (heated at 1325 K with Po2 ~< 10 -~s atm, and quenched) showed good photoactivity without external bias. Impurity band formation forx I> 0.003 provides an extension of the spectral response to longer wavelengths, and improves the quantum efficiency. Weakly doped samples (x < 0.002) show a modest photo-oxidation after operation in a PEC cell for several hours, but this feature is absent for larger doping. No significant photodecomposition effects were seen after operation at AM2 illumination for up to 50 hr. 9 Electrochemical Society Active Member. ABSTRACTVarious pieces of sintered strontium titanate doped with metal oxides were used as photoanodes in aqueous solutions. Some of them (having Ru, V, Cr, Ce, Co, Rh) caused photocurrents with light in the visible region. The production of oxygen at the semiconductor electrode and hydrogen at the counterelectrode was confirmed. For the electrode doped with RuO2, the quantum efficiency of the photocurrents with the visible light (400-500 nm) reachedca. 2% under anodic polarization. Based on these results and the reflection and electroluminescence spectra of the sinter, it is concluded that the photocurrent arises from an electronic transition from a dopant level to the conduction band, the former lying a little above the valence band.

show abstract

Electronic conduction in quenched ceramic samples of highly reduced lanthanum doped SrTiO3

Cited by 28 publications

References 42 publications

A study on the structural and electrical properties of lanthanum-doped strontium titanate prepared in air

A study on the structural and electrical properties of lanthanum-doped strontium titanate prepared in air

Conductivity and expansion at high temperature in Sr0.7La0.3TiO3−α prepared under reducing atmosphere

Ceramic SrTiO3 Photoanodes: Enhancement of Photoactivity Through Donor Doping

Contact Info

Product

Resources

About