- Rietveld analysis of the structure of Pb1-xTix O1+x by neutron diffraction
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The Rietveld neutron powder profile analysis of Pb1-xTixO1+x is reported. The structure is similar to the ∝-PbO one (P 4/nmm; Z=2). A contraction of the cell parameters is observed when substituting titanium for lead. The
- Garnier,Moreau,Gavarri
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- Preparation of Undoped Lead Titanate Ceramics via Sol-Gel Processing
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Crack-free, undoped PbTiO3 ceramics were fabricated successfully using sol-gel-synthesized powder prepared from chelated titanium alkoxide and lead acetate. The sintered ceramics, 8.3 mm in diameter and 6-8 mm thick, were 96% dense. In the present study, PbTiO3 ceramics with excess lead (Pb:Ti = 1.1:1.0) had large grains, averaging 14.3 μm. Lower-lead ceramics (Pb:Ti = 1.0:1.0 and 0.9:1.0) had smaller grains, averaging 1.8 μm. The PbTiO3 ceramics with a high lead content cracked during sintering at 1150°C, whereas the other ceramics did not crack. Excess lead, in a more-than-stoichiometric ratio, promoted grain growth and caused disintegration of the ceramics. Therefore, uncracked PbTiO3 ceramics apparently can be fabricated by avoiding excess lead, possibly because restricted grain growth in low-lead ceramics causes low residual stress over many small grains during transition. The electrical properties measured in the present study for PbTiO3 ceramics with a Pb:Ti ratio of 1:1 are d33 = 35 pC/N, K3 = 64, kp = 0.59, and kt ≈ 0.
- Kim, Sunuk,Jun, Myong-Cheol,Hwang, Soon-Cheol
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p. 289 - 296
(2008/10/09)
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