Cracking during Pyrolysis of Oxide Thin Films‐Phenomenology, Mechanisms, and Mechanics
作者： San-Yuan Chen , I-Wei Chen
DOI: 10.1111/J.1151-2916.1995.TB09066.X
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摘要: Cracking phenomena of oxide (BaTiO{sub 3} and Pb(Zr{sub 1{minus}x}Ti{sub x})O{sub 3}) thin films prepared from metal carboxylate alkoxide solutions were studied. At a higher heating rate in reducing atmosphere, cracks formed with morphology similar to that seen dried mud or on cracked glazes. lower an O{sub 2} apparently degassing bubbles small crystallites, starlike, short cracks. The critical conditions for these two cracking modes associated transient stress maxima during pyrolysis: first at intermediate temperature, when the maximum weight loss occurred, then toward completion pyrolysis, as nearly ceramic state was approached. A viscous analysis fracture energy considerations used rationalize observed scaling relations between crack thickness, spacing, processing parameters.
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