On the breakdown of zircon upon “dry” thermal annealing
On the breakdown of zircon upon “dry” thermal annealing
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关于“干”热退火时锆石的分解
DOI：
10.1007/s00710-009-0087-9
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发表时间：
2009
影响因子：
1.8
通讯作者：
T. Häger
中科院分区：
文献类型：
--
作者：
T. Váczi;L. Nasdala;R. Wirth;M. Mehofer;E. Libowitzky;T. Häger
对不同来源的无次生化学蚀变和有次生化学蚀变的锆石样品在1400 °C下热处理96 h。由此产生的新相和纹理表明，在所有实验中，不同程度地发生了锆石分解成组分氧化物。发现坩埚材料对击穿的程度有很大影响，特别是在改变起始材料的情况下。在这项研究中，锆石颗粒破碎的进展阶段进行了描述。讨论了可能影响其分解的因素，包括辐射损伤、二次蚀变和外部反应条件（样品容器、气氛）。在锆英石的干法退火中，通常应避免使用氧化铝坩埚，以尽量减少不受控制的氧化物分解。
Zircon samples without and with secondary chemical alteration from diverse sources were subjected to heat treatment at 1400 °C for 96 h. Resulting new phases and textures suggest that decomposition of zircon into component oxides occurred in all experiments to various degrees. The crucible material was found to have a strong influence on the extent of breakdown, especially in the case of altered starting materials. In this study the progressive stages of the breakdown of zircon grains are described. The factors that may govern the decomposition are discussed, including radiation damage, secondary alteration and external reaction conditions (sample container, atmosphere). Alumina crucibles should generally be avoided in dry annealing of zircon, to minimise uncontrolled breakdown into oxides.