SEMICONDUCTING PROPERTIES OF UNDOPED TiO 2

Nowotny, J.; Radecka, M.; Rękas, M.

doi:10.1016/s0022-3697(96)00204-1

Cited by 113 publications

(136 citation statements)

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“…Figure 3 represents a collection of the reported electrical conductivity data at 1273 K. As seen, there is a substantial scatter of both absolute values of data and their temperature dependence. This collection of TiO at 1273 K determined in the present work along with the data reported in the literature [6,11,19,28,29,31,32] showing the discrepancies in the absolute values of data and their…”

Section: Brief Reference Overviewsupporting

confidence: 41%

“…This will be achieved in the present study by simultaneous measurements of selfconfirmatory measurements of two electrical properties in well defined experimental conditions for polycrystalline 2 TiO [7]. The data of Blumenthal et al [11][12][13] [32], suggest that the related electrical properties may be considered in terms of the models described by the Strongly Reduced Regime and the Reduced Regime. Figure 3 represents a collection of the reported electrical conductivity data at 1273 K. As seen, there is a substantial scatter of both absolute values of data and their temperature dependence.…”

Section: Brief Reference Overviewmentioning

confidence: 95%

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Electrical properties of polycrystalline TiO₂ at elevated temperatures. Electrical conductivity

Nowotny

Бак

Burg

2007

Physica Status Solidi (b)

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IN MEMORIAM. This paper is dedicated to the memory of Dr. J. Bruce Wagner, Jr. (1926–2006), long time Professor of Materials Science and Engineering at the Northwestern University, Evanston, IL and Regents Professor of the Arizona State University, Tempe, AZ. Professor Wagner was prominent scientist in the area of solid‐state science, electrochemistry and high temperature chemistry. He served as Director of the Material Research Centre at the Technological Institute of Northwestern University, Director of the Centre for Solid State Science at the Arizona State University. He was also the President of the Electrochemical Society.The present work reports the electrical properties for high purity polycrystalline TiO2 using the measurements of electrical conductivity in the temperature range 1123–1323 K and in the gas phase of controlled oxygen activity (10–13 Pa < p (O2) < 105 Pa). The slope of the log σ vs. log p (O2) dependence is –1/5.4, which is considered in terms of mixed electronic and ionic compensation. The electrical conductivity data within the n –p transition were used for the determination of the conductivity components related to electrons, electron holes and ions. These data were used for the determination of the n –p transition point. The band gap determined from the conductivity components related to electronic charge carriers is equal to 2.8 eV. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Section: Brief Reference Overviewsupporting

confidence: 41%

Section: Brief Reference Overviewmentioning

confidence: 95%

Electrical properties of polycrystalline TiO₂ at elevated temperatures. Electrical conductivity

Nowotny

Бак

Burg

2007

Physica Status Solidi (b)

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“…8 This nonstoichiometry causes unintentional doping often referred to as self-doping characterized by electronic states generated by vacancies, including both undercoordinated Ti and O atoms, and structural defects in TiO 2 . 9 In highly defective material, self-doping can produce large variations in conductivity and obscure or even dominate intentional doping. Forro and co-workers 10 reported that the resistivity of single crystal anatase with oxygen deficiency can vary between 10 À1 and 10 1 Xcm, and exhibits metal-like characteristics (dq=dT > 0) in the 300-60 K temperature range.…”

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confidence: 99%

Electrical property measurements of Cr-N codoped TiO2 epitaxial thin films grown by pulsed laser deposition

Jaćimović

Gáal

Magrez

et al. 2013

Applied Physics Letters

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The temperature dependent resistivity and thermo-electric power of Cr-N codoped TiO2 were compared with that of single element N and Cr doped and undoped TiO2 using epitaxial anatase thin films grown by pulsed laser deposition on (100) LaAlO3 substrates. The resistivity plots and especially the thermoelectric power data confirm that codoping is not a simple sum of single element doping. However, the negative sign of the Seebeck coefficient indicates electron dominated transport independent of doping. The narrowing distinction among the effects of different doping methods combined with increasing resistivity of the films with improving crystalline quality of TiO2 suggest that structural defects play a critical role in the doping process.

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“…With respect to conduction this assumption may be correct when the electronic component of conduction is the predominant one while the ionic component may be ignored. This is the case for extremely reduced TiO2, however, the TiO2 that is either moderately reduced or oxidized are influenced by ionic charge carriers [16,17]. It was shown that the transference number related to ionic defects may reach 50% at the n-p transition point [17].…”

Section: Postulation Of the Problemmentioning

confidence: 99%

“…The most common approach in the studies of defect [16,17]. So far, however, the impact of ionic charge carriers on thermopower remains unknown.…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric power of mixed electronic-ionic conductors II. Case of titanium dioxide

Бак

Nowotny

Rękas

et al. 2004

Ionics

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Abstract. The purpose of the present work is the determination of the thermopower components corresponding to different charge carriers (electrons, electron holes and ions) for TiO 2 and the use of these data for evaluation of the effect of symmetry between these two properties. The procedure of the determination of these components was based on the following two approximations: 9 The first approximation is based on a symmetrical model assuming a consistency between thermopower and electrical conductivity within the n-p transition (minimum of electronic component of the electrical conductivity corresponds to zero value of the electronic component of thermopower). 9 The second approximation is based on the apparent asymmetry between thermopower and electrical conductivity within the n-p transition as determined from the first approximation. The analysis, based on the data of the electronic components of thermopower and electrical conductivity for TiO2 single crystal, results in the band gap (using the Jonker formalism). The determined band gap is equal to 2.77 eV and 2.57 eV at the first and the second approximations, respectively, while the band gap determined from the experimentally measured data is equal 3.35 eV. These values are consistent with the band gap determined from the data of electrical conductivity corresponding to the n-p transition point (Eg = 3.16 eV) and for the data measured experimentally and those free of the ionic conductivity component (Eg = 2.79 eV). The obtained results indicate that thermopower and electrical conductivity most likely exhibit the effect of symmetry.

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SEMICONDUCTING PROPERTIES OF UNDOPED TiO 2

Cited by 113 publications

References 38 publications

Electrical properties of polycrystalline TiO₂ at elevated temperatures. Electrical conductivity

Electrical properties of polycrystalline TiO₂ at elevated temperatures. Electrical conductivity

Electrical property measurements of Cr-N codoped TiO2 epitaxial thin films grown by pulsed laser deposition

Thermoelectric power of mixed electronic-ionic conductors II. Case of titanium dioxide

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SEMICONDUCTING PROPERTIES OF UNDOPED TiO 2

Cited by 113 publications

References 38 publications

Electrical properties of polycrystalline TiO2 at elevated temperatures. Electrical conductivity

Electrical properties of polycrystalline TiO2 at elevated temperatures. Electrical conductivity

Electrical property measurements of Cr-N codoped TiO2 epitaxial thin films grown by pulsed laser deposition

Thermoelectric power of mixed electronic-ionic conductors II. Case of titanium dioxide

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Product

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Electrical properties of polycrystalline TiO₂ at elevated temperatures. Electrical conductivity

Electrical properties of polycrystalline TiO₂ at elevated temperatures. Electrical conductivity