2005
DOI: 10.1007/s10832-005-2926-3
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Defects and Transport in Langasite II: Donor-doped (La3Ga4.75Nb0.25SiO14)

Abstract: The electrical conductivity of Nb doped langasite (La 3 Ga 4.75 Nb 0.25 SiO 14 ) was examined as a function of temperature and oxygen partial pressure by complex impedance spectroscopy. A pO 2 -independent regime was found at high pO 2 followed by a pO −1/6 2 dependent regime at low pO 2 . A defect model consistent with these results was derived in which the electron density n is fixed by the density of ionized Nb donors at high pO 2 and by the generation of oxygen vacancies at low pO 2 . The temperature and o… Show more

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Cited by 11 publications
(17 citation statements)
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“…The value can be compared with the conductivity σ R of the langasite single crystals. Accompanying concentration cell and thermoelectric power measurements confirmed the dominance of ionic conduction [80][81][82].…”
Section: Hydrogen Free Atmospheresmentioning
confidence: 66%
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“…The value can be compared with the conductivity σ R of the langasite single crystals. Accompanying concentration cell and thermoelectric power measurements confirmed the dominance of ionic conduction [80][81][82].…”
Section: Hydrogen Free Atmospheresmentioning
confidence: 66%
“…The electrical conductivity of langasite is measured in the temperature range from 400 to 1050 • C. In the first part of this section, the conductivity data of polycrystalline langasite presented in [80][81][82] are summarized. These results are compared with that of single crystalline langasite in the second part.…”
Section: Electrical Conductivitymentioning
confidence: 99%
“…In order to engineer both the conductivity and the oxygen nonstoichiometry of langasite, we characterized its electrical properties under equilibrium conditions and determined its defect structure [12,13]. In [12], acceptor doped langasite was shown to be a mixed ionic-electronic conductor with the ionic conducting specie being the oxygen vacancy fixed in concentration by the acceptor impurity.…”
Section: Introductionmentioning
confidence: 99%
“…The electronic conductivity is dominated by electrons under reducing conditions for low acceptor levels and by holes under oxidizing conditions for higher acceptor levels with characteristic −1/4 and +1/4 power law dependences on pO 2 , respectively. In [13], donor doped langasite was shown to be a predominantly electronic conductor via electrons. At high pO 2 , the electron density is fixed by ionized donors; whereas at lower pO 2 , electrons generated by reduction dominate with a characteristic −1/6 power law dependence on pO 2 .…”
Section: Introductionmentioning
confidence: 99%
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