For the first time the fabrication of ferroelectric SrBi2(Ta,Nb)(2)O-9 thin
film capacitors with RuO2 electrodes is conducted using a full chemical ro
ute. SrBi2(Ta,Nb)(2)O-9 sols were obtained from niobium and tantalum ethoxi
des mixed with bismuth and strontium 2-ethylhexanoates. RuO2 sols were prep
ared by dissolving an aqueous solution of ruthenium nitrosylnitrate into 2-
methoxyethanol. Capacitors were fabricated by spin coating the precursor so
lutions on silicon wafers according to the Si/RuO2/ SrBi2(Ta,Nb)(2)O-9/RuO2
sequence. Fully crystallized crack-free materials (RuO2 and SrBi2(Ta,Nb)(2
)O-9) were obtained bq, annealing at 700 degrees C for 2 h. Hysteresis loop
s (3-10 V) are similar to those observed using platinum electrodes. (C) 199
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