摘要
在3．0－5．0GPa，1150－1750℃，1－480min条件范围内，合成了钠铝辉石，通过XRD、SEM及IR分析对比研究了人工翡翠和天然翡翠的微观精细结构；通过DAT分析测定了人工翡翠与天然翡翠的熔点，淬火实验检验了人工翡翠的熔点，通过退火及老化实验研究了翡翠的热稳定性。同时还就人工翡翠和天然翡翠的硬度、密度及折射率等其它物化性质进行了比较研究。根据上述研究总结了合成优质钠铝辉石翡翠的最佳实验条件为压力＞4．0GPa，温度＞1450℃，晶化时间＞45min。
Clinopyroxene NaAlSi2O6 was synthesized under varying pressures of 3.0-5.0GPa and at the temperature range of 1150-1750℃, for periods of 1-480min .The glass material was completely transformed into homogeneous penetrating fibrous texture of clinopyroxene NaAlSi2O6 when the crystallization was carried out on the optimum condition beyond 4.0GPa, 1450℃, and 45min . The microstructure of synthetic clinopyroxene NaAlSi2O6 was very similiar with that of natural one. Penetrating fibrous grains of the clinopyroxene were highly ordered when the sample was synthesized at above optimun crystalline condition.The six-fold coordination of the Al3+ in the presence of Si4+ in clinopyroxene NaAlSi2O6was transformed into foux-fold coordination of the Al3+ in both nepheline NaAlSiO4 and albite NaAlSi3O8 after it was treated at 1.013×105 Pa and 1173 K for 24 hrs. The other preconceived physical and chemical properties of synthetic clinopyroxene was higlily consistent with those of the natural sample. The clinopyroxene doped with Cr3+ , NaAlSi2O6:Cra+ (0.5-1.0wt%), which was synthesized beyond the optimum crystalline condition, was of brightness and, hardnes, compact,emerald,translucence.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
1994年第7期604-609,共6页
Acta Physico-Chimica Sinica
