کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1329733 978924 2008 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Uncontrollable expansion of PbZn1/3Nb2/3O3–PbTiO3 perovskite⇒pyrochlore transition during spark plasma sintering: Mechanism proposal using infinite periodic minimal surfaces
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Uncontrollable expansion of PbZn1/3Nb2/3O3–PbTiO3 perovskite⇒pyrochlore transition during spark plasma sintering: Mechanism proposal using infinite periodic minimal surfaces
چکیده انگلیسی

The PbZn1/3Nb2/3O3–PbTiO3 phase (PZN–PT) prepared by mechanosynthesis exhibits interesting relaxor properties when transformed into nanostructured ceramic by spark plasma sintering. When trying to obtain denser ceramic to enhance physical properties, the PZN–PT phase transformation from perovskite to pyrochlore structure induces the graphite die explosion. An explanation of this phenomenon is based on the reorganization of the lone pairs corresponding to Pb2+ cations into the large cavities of pyrochlore network, inducing an important cell volume increase, together with the speed of transformation depicted in the light of infinite periodic minimal surfaces describing the perovskite (P-surface) and the pyrochlore (F-surface) networks, respectively.

The explosive phenomenon observed during the sintering of PZN–PT phase using spark plasma sintering is directly linked to the perovskite⇒pyrochlore phase transition and the volume increase related to the role of the Pb lone pairs. Infinite periodic minimal surfaces have been used to describe the structures and the phase transition.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Solid State Chemistry - Volume 181, Issue 11, November 2008, Pages 2918–2923
نویسندگان
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