A kind of preparation method of low titanium dry forsterite single crystal under high temperature and high pressure conditions

Abstract

The invention discloses a preparation method of low-titanium dry forsterite single crystal under high temperature and high pressure conditions. The tetrabutyl titanate was added to 50 ml of anhydrous ethanol solution; the jar was sealed and stirred with a thick plastic film for 24 hours, and then 30 ml of 69-70% acid solution was added at 80 ° C, 1000 rpm and stirred for 24 hours ; Evaporate all the solution in the jar to dryness at 150°C, put the mixed powder in a platinum crucible; calcine at a high temperature in a high-temperature muffle furnace; grind and mix the calcined sample in an agate mortar and evenly press it into a disc, three The sheets are stacked in a platinum crucible, roasted and ground into powder in a high-temperature oxygen atmosphere furnace, pressed into a cylinder, sealed in a gold-palladium alloy tube, and sintered at high temperature and high pressure to obtain a forsterite single crystal; it solves the technical blank of low-titanium olivine single crystal preparation.

Description

technical field [0001] The invention belongs to the technical field of mineral single crystal sample synthesis under high temperature and high pressure conditions, and particularly relates to a preparation method of low titanium dry forsterite single crystals under high temperature and high pressure conditions. Background technique [0002] Olivine is one of the most important constituent minerals of the upper mantle. Forsterite is the most important endmember component of mantle olivine. Its electrical properties, elasticity, diffusion, thermoelasticity coefficient and other physical properties under high temperature and high pressure conditions received extensive attention from geophysicists. Throughout the world, the experimental equipment used in the high temperature and high pressure experimental research on forsterite mainly includes: autoclave, piston cylinder, multi-face top press, diamond pressure cavity, etc. Due to the many experimental techniques and methods, mo...

AI Technical Summary

Problems solved by technology

Due to the limitation of the experimental chamber of the multi-faced press and the calibration accuracy of the recovered samples obtained by synthesis, geoscientists may use natural olivine to replace artificially synthesized low-titanium forsterite (due to the relatively low titanium content and distribution very inhomogeneous) or extrapolated to low-titanium olivine by using relatively high-titanium-containing forsterite, and the use of this initial experimental sample cannot truly reveal its various geophysical properties

Regardless of whether it is natural olivine or extrapolation from high titanium content to low titanium content, it is difficult to adjust the titanium content value arbitrarily, which leads to a large gap in the numerical simulation of the physical properties of the application of titanium-containing forsterite in high temperature and high pressure experiments. deviation

So far, there is no relevant report on the synthetic method of the titanium-containing olivine experimental samples corresponding to the titanium content in natural forsterite below 50ppm wt%.