Lead titanate
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| Names | |
|---|---|
| Other names
Lead(II) titanate
Lead titanium oxide Lead(II) titanium oxide | |
| Identifiers | |
| ECHA InfoCard | 100.031.841 |
PubChem CID
|
|
| Properties | |
| PbTiO3 | |
| Molar mass | 303.09 g/mol |
| Appearance | Yellow powder |
| Density | 7.52 g/cm3 |
| Insoluble | |
| Hazards | |
| Main hazards | Toxic (T) Dangerous for the environment (N) May damage fertility or unborn child |
| R-phrases (outdated) | R20/22, R33, R50/53, R61, R62[1] |
| S-phrases (outdated) | S45, S53, S60, S61[1] |
| NFPA 704 | |
| Lethal dose or concentration (LD, LC): | |
LD50 (median dose)
|
12000 mg/kg (rat) |
| Related compounds | |
Other anions
|
Lead dioxide Lead acetate |
Other cations
|
Caesium titanate Iron(II) titanate |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
| Infobox references | |
Lead(II) titanate is an inorganic compound with the chemical formula PbTiO3. It is the lead salt of titanic acid. Lead(II) titanate is a yellow powder that is insoluble in water.
At high temperatures, lead titanate adopts a cubic perovskite structure. At 760 K,[2] the material undergoes a second order phase transition to a tetragonal perovskite structure which exhibits ferroelectricity. Lead titanate is one of the end members of the lead zirconate titanate (Pb[ZrxTi1-x]O3 0≤x≤1, PZT) system, which is technologically one of the most important ferroelectric and piezoelectric ceramics; PbTiO3 has a high ratio of k33 to kp with a high kt.
Lead titanate occurs in nature as mineral macedonite.[3][4]
Toxicity[edit]
Lead titanate is toxic, like other lead compounds. It irritates skin, mucous membranes and eyes. It may also cause harm to unborn babies and might have effects on fertility.[5]
Solubility in water[edit]
The solubility of hydrothermally-synthesized perovskite-phase PbTiO3 in water was experimentally determined at 25 and 80 °C to depend on pH and vary from 4.9x10−4 mol/kg at pH≈3, to 1.9x10−4 mol/kg at pH≈7.7, to "undetectable" (<3.2x10−7 mol/kg) in the range 10<pH<11. At still higher pH values, the solubility increased again. The solubility was apparently incongruent and was quantified as the analytical concentration of Pb.[6]
References[edit]
- ^ a b Alfa Aesar "Archived copy". Archived from the original on 2011-07-07. Retrieved 2010-09-12.
- ^ Noheda, Cereceda, Iglesias, Lifante, Gonzalo, Chen and Wang, Phys. Rev. B 51, 16388 (1995)
- ^ Radusinović, Dušan and Markov, Cvetko "Macedonite - lead titanate: a new mineral", American Mineralogist 56, 387-394 (1971), http://www.minsocam.org/ammin/AM56/AM56_387.pdf
- ^ Burke, E.A.J. and Kieft, C. "Second occurrence of makedonite, PbTiO3, Långban, Sweden", Lithos 4, 101-104 (1971)
- ^ http://www.alfa.com/content/msds/USA/35671.pdf
- ^ Jooho Moon, Melanie L. Carasso, Henrik G. Krarup, Jeffrey A. Kerchner, "Particle-shape control and formation mechanisms of hydrothermally derived lead titanate", Journal of Materials Research, Vol. 14, No.3, March 1999.[1]