DOI: 10.1111/j.1151-2916.2001.tb00828.x. Positive Temperature Coefficient of Resistivity Effect in Highly Donor

Positive Temperature Coefficient of Resistivity Effect in Highly Donor–Doped Barium Titanate

10.1111/j.1151-2916.2001.tb00828.x

Crossref journal-article

Wiley

Journal of the American Ceramic Society (311)

Abstract

BaTiO3 ceramics doped with different La concentrations (0–12 mol%) were prepared by sintering under the reducing conditions of a nitrogen atmosphere containing 1% hydrogen. The critical donor concentration that causes blocking of the exaggerated grain growth was observed to be ∼10 mol% La. The samples, which were semiconducting after sintering under reducing conditions, were subsequently reoxidized by annealing in air to induce the positive temperature coefficient of resistivity (PTCR) effect. After reoxidation at 1150°C a noticeable PTCR effect was observed in the samples doped with La concentrations as high as 2.5 mol%. The room‐temperature resistivity after reoxidation was found to increase with increasing donor concentration due to an increase in the thickness of the insulating layers at the grain boundaries. TEM analysis showed that reoxidation of the samples caused precipitation of the Ti‐rich compound Ba6Ti17O40 inside the doped BaTiO3‐matrix grains.

Bibliography

Makovec, D., Ule, N., & Drofenik, M. (2001). Positive Temperature Coefficient of Resistivity Effect in Highly DonorâDoped Barium Titanate. Journal of the American Ceramic Society, 84(6), 1273â1280. Portico.

Authors 3

Darko Makovec (first)
Nina Ule (additional)
Miha Drofenik (additional)

References 23 Referenced 42

10.1111/j.1151-2916.1987.tb04999.x
10.1111/j.1151-2916.1990.tb09800.x
{'key': 'e_1_2_1_4_2', 'first-page': '1', 'article-title': 'Defect Chemistry and Electrical Transport Properties of Barium Titanate', 'volume': '3', 'author': 'Seuter A. M. J. H.', 'year': '1974', 'journal-title': 'Philips Res. Rep., Suppl.'} / Philips Res. Rep., Suppl. / Defect Chemistry and Electrical Transport Properties of Barium Titanate by Seuter A. M. J. H. (1974)
{'key': 'e_1_2_1_5_2', 'first-page': '526', 'article-title': 'The Kinetics of Equilibrium Restoration in Barium Titanate Ceramics', 'volume': '31', 'author': 'Wernicke R.', 'year': '1976', 'journal-title': 'Philips Res. Rep.'} / Philips Res. Rep. / The Kinetics of Equilibrium Restoration in Barium Titanate Ceramics by Wernicke R. (1976)
10.1023/A:1004794223988
{'key': 'e_1_2_1_7_2', 'first-page': '242', 'volume-title': 'Technical Chemical Calculations', 'author': 'Beskov S. D.', 'year': '1962'} / Technical Chemical Calculations by Beskov S. D. (1962)
{'key': 'e_1_2_1_8_2', 'first-page': '245', 'volume-title': 'Diffusion Phenomena in Thin Films And Microelectronic Materials', 'author': 'Handwerker C. A.', 'year': '1986'} / Diffusion Phenomena in Thin Films And Microelectronic Materials by Handwerker C. A. (1986)
10.1111/j.1151-2916.1994.tb09781.x
10.1111/j.1151-2916.1987.tb05723.x / J. Am. Ceram. Soc. / Topotaxy between BaTiO3 and Ba6Ti17O40 by Kraševec V. (1987)
D.MakovecandM.Drofenik “Microstructural Changes during the Reduction/ Reoxidation Process in Donor‐Doped BaTiO3Ceramics “J. Am. Ceram. Soc. in press.
10.1016/0038-1101(61)90080-6
10.1002/pssa.2211150116
10.1006/jssc.1996.7221
10.1111/j.1151-2916.1998.tb02575.x
10.1016/0025-5408(86)90227-8
{'key': 'e_1_2_1_17_2', 'first-page': '27', 'volume-title': 'Impedance Spectroscopy', 'author': 'Macdonald J. R.', 'year': '1987'} / Impedance Spectroscopy by Macdonald J. R. (1987)
10.1016/0038-1101(64)90068-1
{'issue': '3', 'key': 'e_1_2_1_19_2', 'first-page': '73', 'article-title': 'The PTC Effect of Barium Titanate', 'volume': '38', 'author': 'Daniels J.', 'year': '1978', 'journal-title': 'Philips Tech. Rev.'} / Philips Tech. Rev. / The PTC Effect of Barium Titanate by Daniels J. (1978)
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10.1007/BF00354542
10.1111/j.1151-2916.1965.tb14785.x
10.1111/j.1151-2916.1997.tb02789.x

Dates

Type	When
Created	15 years, 1 month ago (July 24, 2010, 1:46 a.m.)
Deposited	1 year, 9 months ago (Nov. 23, 2023, 2:37 a.m.)
Indexed	3 months, 1 week ago (May 21, 2025, 4:25 p.m.)
Issued	24 years, 2 months ago (June 1, 2001)
Published	24 years, 2 months ago (June 1, 2001)
Published Online	20 years, 8 months ago (Dec. 20, 2004)
Published Print	24 years, 2 months ago (June 1, 2001)

Funders 0

None

BibTeX

@article{Makovec_2001, title={Positive Temperature Coefficient of Resistivity Effect in Highly Donor–Doped Barium Titanate}, volume={84}, ISSN={1551-2916}, url={http://dx.doi.org/10.1111/j.1151-2916.2001.tb00828.x}, DOI={10.1111/j.1151-2916.2001.tb00828.x}, number={6}, journal={Journal of the American Ceramic Society}, publisher={Wiley}, author={Makovec, Darko and Ule, Nina and Drofenik, Miha}, year={2001}, month=jun, pages={1273–1280} }

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