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21.多晶石墨多晶石墨是具有一定大小的和清晰的结晶区域的石墨材料,而不管它们晶体结构的完整性和择优定向性如何(参见石墨材料,清晰结晶区域)。注:术语多晶石墨通用于多颗粒石墨,定义是相一致的,但是这并不确切,因为多颗粒石墨的所有颗粒本身是多晶的,多晶石墨可能呈无规则的定向、程度不同的择优定向或如在某些热解石墨中那样呈高度定向的结构(高定向热解石墨)。但是,在典型的多晶结构和高定向热解石墨(HOPG)的“单晶状”结构之间没有明显的过渡[参
21. Polycrystalline Graphite Polycrystalline graphite is a graphite material of a certain size and distinct crystalline region, regardless of the integrity and preferential orientation of their crystal structure (see Graphite, Clear Crystallization Area). Note: The term polycrystalline graphite is common to multiparticulate graphite and the definition is consistent, but this is not exact, since all particles of multiparticulate graphite are themselves polycrystalline and polycrystalline graphite may be randomly oriented and of varying degrees Preferentially oriented or highly oriented structure (highly oriented pyrolytic graphite) as in some pyrolytic graphite. However, there is no significant transition between the typical polycrystalline structure and the “monocrystalline” structure of highly oriented pyrolytic graphite (HOPG) [see