Effects of Physico-chemical Factors of Sol on the Degree of Preferred Orientation in <TEX>$Pb(Mg, Zn)_{1/3}Nb_{2/3}O_3$</TEX> Thin Films

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J. Korean Ceram. Soc. > Volume 32(3); 1995 > Article

Journal of the Korean Ceramic Society 1995;32(3): 305.

Sol의 물리화학적 변수들이 $Pb(Mg, Zn)_{1/3}Nb_{2/3}O_3$ 박막의 우선 배향성에 미치는 효과

조문규, 장현명, 김광수¹

포항공과대학 재료공학과 유전재료 물리화학 연구실
¹일본국 무기재질 연구소

Effects of Physico-chemical Factors of Sol on the Degree of Preferred Orientation in $Pb(Mg, Zn)_{1/3}Nb_{2/3}O_3$ Thin Films

ABSTRACT

Thin films of Pb(Mg, Zn)1/3Nb2/3O3 were fabricated by spin coating the Pb-Mg-Zn-Nb-O complex alkoxide sols on(111) Pt-coated MgO (100) planes. It was observed that the content of H2O and the rheological characteristics of sol greatly influenced the orientation of perovskite grains after thin-film formation. A strong preferential orientation of (100)-type planes of the perovskite grains was obtained for the sol aged for 15 days with the molar ratio of H2O to total metal alkoxides=2. As small angle X-ray scattering experiment in the Porod region was performed to correlate the observed preferential orientation with the network structure of precursors at various stage of aging. It was shown that the degree of branching of the Pb-Mg-Zn-Nb-O precursor chain had a direct effect on the preferred oreintation, and weakly branched precursor systems led to highly oriented grains after thin-film formation.

Key words: PMZN, Preferred orientation, (100) perovskite, Aging time, SAXS