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Barium titanate

Protocol number:	M130162
Industry:	Chemistry, Geology / mineralogy
Feed Size:	< 80 µm
Desired Fineness:	d50 < 10 nm
Quantity:	100 ml
Recommendation:	To achieve a maximum fineness, we recommend using a Planetary Micro Mill PULVERISETTE 7 premium line with a ball acceleration of up to 95 g. We recommend using bowls and balls made of zirconium oxide.

Result 1

	Planetary Micro Mill PULVERISETTE 7 premium line main disk speed: 1100 rpm
Equipment:	80 ml grinding bowl made of zirconium oxide (ZrO2) + 100 g of 2,0 mm Ø ZrO2 grinding balls.
Feed quantity:	20 g
Feed Size:	< 80 µm (checked by optical microscopy)
Additive:	+ 45 ml water
Grinding time:	15 min
Final fineness:	d50 < 150 nm
Comments:	In our first test, we used 20 g of sample and started grinding with 2 mm Ø grinding balls. To maintain a motor oil like slurry (for an optimum grinding result), we added 45 ml of water. To avoid over pressure, we ground the sample in steps of 3 minutes, followed by a programmed pausing time of 10 minutes. After several cycles, the outside temperature of the bowl should be checked (remain below 80°C); grinding time or programmed pausing time might be readjusted afterwards. This is counting for the following grinding trial too. For a proper detection of fine particles (< 2 µm), Mie parameters are required. We don’t provide proper parameters for barium titanate and used best fitting. With this parameters, we found d50 < 150 nm after a total grinding time of 15 minutes. By proceeding grinding, equal d50 has been detected after 30 minutes of grinding too. For this, the used 2 mm grinding balls didn’t achieve a better grinding result. A change of balls might be required (e.g. < 0,1 mm Ø) to improve the grinding result. We packed this sample for demonstration and used an equal perpetrated sample for pre grinding in result 2.
Download:	M130162_BaTiO3_-_2mm__15min.pdf

Result 2

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