双生和同外延在CaCO3多晶生长形态上的合作。一、霰石

IF 6.1 3区 材料科学 Q1 Biochemistry, Genetics and Molecular Biology Journal of Applied Crystallography Pub Date : 2023-10-20 DOI:10.1107/s1600576723008208
Dino Aquilano, Marco Bruno, Stefano Ghignone, Linda Pastero
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引用次数: 0

摘要

方解石和文石是caco3多晶中最丰富的两种,也以其丰富的形态和习性而闻名,这与孪生有关。此外,方解石→文石转变已经争论了很长一段时间,尽管迄今为止,从实验和理论的角度来看,每种晶型中发生的同外延都被忽视了。孪生是常见的,不幸的是,它可能是欺骗性的,因为它可能被误认为是同质外延,从而导致混淆关于许多晶体聚集体的生长机制。在这里,进行了实验和理论研究,以调查文石中的孪晶和同晶外延:(i)由横向{010}和{110}文石形成的接触和穿透聚集体的孪晶和同晶外延之间的联系;(ii){001}类松石与{010}类松石和棱柱形{110}文石之间的同外延关系。这项工作试图提供一种新的方法来监测文石的生长机制,在这种情况下,文石不是作为单晶而是作为集合体获得的。在我们即将进行的方解石研究中将探讨一个类似的问题。
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Twinning and homoepitaxy cooperation in the already rich growth morphology of CaCO3 polymorphs. I. Aragonite
Calcite and aragonite are the two most abundant among the CaCO 3 polymorphs and are also well known for their rich morphology and habit, to which twinning relevantly contributes. Moreover, the calcite → aragonite transformation has been debated for a long time, even though the homo-epitaxies occurring within each polymorph have been overlooked, to date, from both experimental and theoretical points of view. Twinning is common and unfortunately can be deceptive as it can be mistaken for homo-epitaxy, thus leading to confusion regarding the growth mechanisms of many crystal aggregates. Here, experimental and theoretical studies were carried out to investigate the twinning and homo-epitaxy that operate in aragonite: (i) the connection between twinning and homo-epitaxy for contact and penetration aggregates made by the lateral {010} and {110} aragonite forms; (ii) the homo-epitaxial relationships among the {001} pinacoid and both the {010} pinacoid and the prismatic {110} aragonite forms. This work attempts to provide a new approach to monitoring the growth mechanisms of aragonite in cases where it is obtained not as a single crystal but as an aggregate. An analogous problem will be explored in our forthcoming work on calcite.
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来源期刊
CiteScore
10.00
自引率
3.30%
发文量
178
审稿时长
4.7 months
期刊介绍: Many research topics in condensed matter research, materials science and the life sciences make use of crystallographic methods to study crystalline and non-crystalline matter with neutrons, X-rays and electrons. Articles published in the Journal of Applied Crystallography focus on these methods and their use in identifying structural and diffusion-controlled phase transformations, structure-property relationships, structural changes of defects, interfaces and surfaces, etc. Developments of instrumentation and crystallographic apparatus, theory and interpretation, numerical analysis and other related subjects are also covered. The journal is the primary place where crystallographic computer program information is published.
期刊最新文献
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