Journal
INORGANIC MATERIALS
Volume 41, Issue 12, Pages 1308-1312Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1007/s10789-005-0307-6
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The vaterite-to-calcite phase transition in spheroidal vaterite particles produced by reacting aqueous Ca(NO3)(2) and Na2CO3 solutions at 20 +/- 1 degrees C under 2.6-MHz sonication was studied by scanning electron microscopy and x-ray diffraction. The results are interpreted as evidence that the transformation of vaterite, a metastable phase under ordinary conditions, to calcite follows a relay recrystallization mechanism: vigorous ultrasonic stirring leads to energetic collisions between vaterite and calcite particles, resulting in a transition of the metastable phase to the stable one, followed by the formation of calcite aggregates consisting of 2 to 14 particles.
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