The Growing of Lead Titanate Crystals and Some of their Properties

Item

Title
The Growing of Lead Titanate Crystals and Some of their Properties
Date
1952
Index Abstract
Not Available
Photo Quality
Undetermined
Creator
Rogers, H. H.
Corporate Author
Massachusetts institute of Technology
Extent
21
PB Number
PB108708
Identifier
AD0004803
Access Rights
Unknown
Distribution Classification
1
DTIC Record Exists
Yes
Distribution Change Authority Correspondence
None
Distribution Conflict
No
Abstract
Small high-purity single crystals of PbTiO sub 3 were grown fro m a melt consisting of TiO sub2 and an excess of PbO. The preparation of a large single crystal by the Bridgman-Stockbarger method is described. Subsequent crystal fracturing upon cooling is interpreted by visual observation and x-ray measurements. PbTiO sub3 appears to be the only stable compound in the system PbO-TiO sub2. The chemical reactivity of PbTiO sub 3 is discussed, and data on the thermal dissociation into PbO vapor and solid TiO sub2 are given. PbTiO sub3 is piezoelectric at room temperature, has the domains characteristic of a ferroelectric substance, and undergoes a reversible color change from red to yellow when cooled through the Curie point (about 490 deg C). The density of a cracked crystal, measured at 25 deg C, was 7.96 g/ml, or 99.2% of x-ray density. The birefringence at 25 deg C was measured as a function of wave length (at 5800 A, n subscript max. -n subscript min. = 0.011).
Report Availability
Not available via Contrails
Date Issued
1952-02
Index In
PB/AD Index
Type
report