Reaction condition screening^a,b.

Entry	Piezoelectric material	Milling ball	Yield [%]
1c	BaTiO3 (<3 μm)	ZrO2	15
2	BaTiO3 (<3 μm)	Steel	>99
3	PZT	Steel	95
4d	None (Na2SO4)	Steel	22
5e	None (NaCl)	Steel	16
6	None	Steel	12
7f	BaTiO3 (<3 μm)	Steel	Trace
8	BaTiO3 (0.6–1 μm)	Steel	99
9	BaTiO3 (200 nm)	Steel	99
10g	BaTiO3 (<3 μm)	Steel	Trace
11h	BaTiO3 (<3 μm)	Steel	20

^a1a (0.2 mmol) and BaTiO₃ (<3 μm, 0.2 mmol) in a 2 mL PE milling jar, five 4 mm stainless-steel balls, 3800 rmp.

^bIsolated yields.

^cFive 4 mm ZrO₂ balls, 3800 rpm.

^dAnhydrous Na₂SO₄ (1.9 mmol) as solid grinding aid in the absence of BaTiO₃.

^eNaCl (1.9 mmol) as solid grinding aid in the absence of BaTiO₃.

^fThe reaction was performed under N₂ in a glovebox.

^gThe reaction was carried out in CH₃CN (0.1 M) with a stirring bar at room temperature for 20 min with an air balloon.

^hThe reaction was carried out in acetone (0.1 M) under ultrasonic agitation at room temperature for 20 min with an air balloon.