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Titolo:
High-temperature creep of polycrystalline BaTiO3
Autore:
Park, ET; Nash, P; Wolfenstine, J; Goretta, KC; Routbort, JL;
Indirizzi:
Argonne Natl Lab, Div Energy Technol, Argonne, IL 60439 USA Argonne Natl Lab Argonne IL USA 60439 ergy Technol, Argonne, IL 60439 USA IIT, Mech Mat & Aerosp Engn Dept, Chicago, IL 60616 USA IIT Chicago IL USA 60616 ch Mat & Aerosp Engn Dept, Chicago, IL 60616 USA Army Mat Lab, Adelphi, MD 20783 USA Army Mat Lab Adelphi MD USA 20783Army Mat Lab, Adelphi, MD 20783 USA
Titolo Testata:
JOURNAL OF MATERIALS RESEARCH
fascicolo: 2, volume: 14, anno: 1999,
pagine: 523 - 528
SICI:
0884-2914(199902)14:2<523:HCOPB>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
BARIUM-TITANATE; DEFORMATION; DIFFUSION; CERAMICS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
--discip_EC--
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Park, ET Argonne Natl Lab, Div Energy Technol, 9700 S Cass Ave, Argonne, IL 60439 USA Argonne Natl Lab 9700 S Cass Ave Argonne IL USA 60439 L 60439 USA
Citazione:
E.T. Park et al., "High-temperature creep of polycrystalline BaTiO3", J MATER RES, 14(2), 1999, pp. 523-528

Abstract

Compressive creep of dense BaTiO3 having linear-intercept grain sizes of 19.3-52.4 mu m was investigated at 1200-1300 degrees C by varying the oxygenpartial pressure from 10(2) to 10(5) Pa in both constant-stress and constant-crosshead-velocity modes. Microstructures of the deformed materials wereexamined by scanning and transmission electron microscopy. The stress exponent was approximate to 1, the grain-size dependence was approximate to 1/d(2), and the activation energy was approximate to 720 kJ/mole. These parameters, combined with the microstructural observations (particularly grain displacement and absence of deformation-induced dislocations), indicated thatthe dominant deformation mechanism was grain-boundary sliding accommodatedby lattice cation diffusion. Because of the absence of an oxygen partial pressure dependence, diffusion was probably controlled extrinsically.

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Documento generato il 27/11/20 alle ore 21:52:20