Nanoscale highly refractory metal alloys in primitive meteorites: condensation processes in the early solar system

原始陨石中的纳米级高难熔金属合金：早期太阳系的凝结过程

• 批准号: 168326840
• 负责人: Professor Dr. Gerd Schönhense, since 6/2010
• 金额: --
• 依托单位: Institut für Physik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/168326840?language=en
• 关键词: Nanoscale; highly; refractory; metal; alloys

Carbonaceous meteorites contain material that formed in the earliest phases of solar system history. Its investigation contributes to answering questions from astrophysics and geosciences, a key aspect being the origin of the first solids. Calculations predict the most refractory metals to be the first to condense from a cooling gas of solar composition. Primitive meteorites contain these elements as rare refractory metal nuggets (RMN), alloys of metals with low vapor pressure. During preliminary work (funded by DFG, SCHO 341/10- 1) we have found direct evidence for a condensation origin of RMN and have estimated the cooling rate of the gaseous environment from which the first solids formed. Our previous studies were based on chemically separated particles. The aim of the proposed project is the in situ identification of RMN in thin sections followed by analysis of chemical and morphological properties with atomic resolution using transmission electron microscopy. The investigations may enable us to achieve more detailed knowledge concerning the evolution of the gaseous reservoir from which these first solids formed.

碳质陨石含有太阳系历史最早阶段形成的物质。它的研究有助于回答天体物理学和地球科学的问题，其中一个关键方面是第一个固体的起源。计算预测，最难熔的金属将首先从由太阳组成的冷却气体中凝结出来。原始陨石含有这些元素作为稀有的难熔金属块（RMN），具有低蒸气压的金属合金。在前期工作（由DFG资助，SCHO 341/10- 1）中，我们发现了RMN凝结起源的直接证据，并估计了形成第一个固体的气体环境的冷却速率。我们以前的研究是基于化学分离的颗粒。拟议项目的目的是在薄片中原位鉴定RMN，然后使用透射电子显微镜用原子分辨率分析化学和形态特性。这些研究可以使我们获得关于气态储层演化的更详细的知识，这些气态储层是由气态储层形成的。

项目成果

CONDENSATION OF REFRACTORY METALS IN ASYMPTOTIC GIANT BRANCH AND OTHER STELLAR ENVIRONMENTS

渐近巨星分支和其他恒星环境中难熔金属的凝聚

• DOI: 10.1088/0004-637x/793/1/20
• 发表时间: 2014
• 期刊: The Astrophysical Journal
• 作者: Schwander;Schönhense
• 通讯作者: Schönhense

Composition and clues to the origin of refractory metal nuggets extracted from chondritic meteorites

从球粒陨石中提取的难熔金属块的成分和来源线索

• DOI: 10.1111/maps.12366
• 发表时间: 2014
• 期刊: Meteoritics & Planetary Science
• 影响因子: 2.2
• 作者: Schwander;Harries;Schönhense;Ott U.
• 通讯作者: Ott U.

Synthesis of refractory metal nuggets and constraints on the thermal histories of nugget‐bearing Ca, Al‐rich inclusions

难熔金属熔核的合成及对含熔核富钙、铝夹杂物热历史的限制

• DOI: 10.1111/maps.12440
• 发表时间: 2015
• 期刊: Meteoritics & Planetary Science
• 影响因子: 2.2
• 作者: Schwander;Schönhense;Ott U.
• 通讯作者: Ott U.

Formation of refractory metal nuggets and their link to the history of CAIs

难熔金属块的形成及其与 CAI 历史的联系

• DOI: 10.1016/j.gca.2015.07.014
• 发表时间: 2015
• 期刊: Geochimica et Cosmochimica Acta
• 影响因子: 5
• 作者: Schwander;Kööp;Schönhense
• 通讯作者: Schönhense