Syntheses and electronic behaviors of net-worked, alternating hafnium-organic moiety hybrid copolymers

Okada, Akira; Kuroda, Taketoshi; Seguchi, Yasuhiro; Kawahara, Tetsuro; Yoshihara, Masakuni

doi:10.1007/s10853-006-0352-9

Cited by 2 publications

(1 citation statement)

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“…However, only a few attempts to synthesize HfC following alternative pathways have been published so far, either starting from oxygen containing hafnium organic compounds or hafnocene dichloride. [17][18][19][20][21][22][23] Although introduced oxygen might be removed during processing, experimental procedures avoiding oxidic intermediates would be preferable. Following that thought, our research group occupied itself with the synthesis of non-oxide polymeric precursors containing hafnium-carbon bonds and their subsequent pyrolytic conversion into hafnium carbide.…”

Section: Introductionmentioning

confidence: 99%

The preparation of HfC/C ceramics via molecular design

et al. 2011

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Polymer derived ceramics have received lots of attention throughout the last few decades. Unfortunately, only a few precursor systems have been developed, focusing on silicon based polymers and ceramics, respectively. Herein, the synthesis of novel hafnium containing organometallic polymers by two different approaches is reported. Dialkenyl substituted hafnocene monomers were synthesized and subsequently polymerized via a free radical mechanism. Salt metathesis reactions of hafnocene dichloride with bifunctional linkers led to the formation of polymeric materials. NMR spectroscopic methods--in solution as well as in the solid state--were used to characterize the organometallic polymers. Ceramics were finally obtained after cross-linking and thermal treatment under argon (T(max) = 1800 °C). SEM investigations, elemental analyses, Raman spectroscopy and XRD investigations identified the pyrolyzed products as partially crystalline HfC/C mixed phases.

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