同位体均質結晶の育成 : メルトの蒸発,過冷却,重力の効果 : バルク結晶成長V

概要

論文の詳細を見る
Behaviors of stable oxygen isotopes in crystallizing melts at high temperature have been poorly understood. Due to complicated behaviors of isotopes, it remained difficult to synthesis of isotopically homogeneous crystal Possible effects for cause of isotopic heterogeneity: (1) melt evaporation, (2) supercooling before crystallization, and (3) gravity were examined experimentally and theoretically Melt evaporations evaluated by vacuum heating experiment on some silicon melts always suggest negative isotope fractionation between vapor and melt (α_<v-m><1.0). Supercooling produces positive isotope fractionation between crystal and melt (α_<x-m>. 1.0). For the melt, gravity decreases vapor loss from melts and minimize the isotope fractionation (α_<v-m>.1.0). These fractionations simultaneously affect the FZ crystallization system. Consideration of over-all fractionation factor is necessary for prediction of isotope heterogeneity in the products.
日本結晶成長学会の論文
2002-07-01