It is the physiochemical nature of lead-based perovskites Pb(B)O3 that upon reaction of the component oxides a large volumetric expansion occurs. In addition to perovskites, Pb- and Bi-based pyrochlores (A2B2O7) and the layered structure compound Bi4Ti3O12 also exhibit similar physiochemical behavior. At the temperature of maximum expansion, the associated morphological development results in a porous skeletal type structure consisting of fine particulates that can be readily broken down further by milling. The level of expansion and ease of comminution was shown to be strongly dependent on the starting powder size, using perovskite Pb(ZrTi)O3 as the example. Using this concept of 'reactive calcination,' the state of optimum soft agglomeration and subsequent milling can allow for fully reacted powder with submicron particle size.
|Original language||English (US)|
|Number of pages||6|
|Journal||NIST Special Publication|
|State||Published - Jan 1991|
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