pure element meaning in English

纯元素

In this paper , aggas2 polycrystal was synthesized by two - zone vapor - transport ing and temperature - oscillating method ( tvtm ) with high pure elements silver ( ag ) , gallium ( ga ) , and sulfur ( s ) . in the synthetic procedure , s vapor was transported from lower temperature zone to the higher where s reacted with ag and ga to get aggas2 , and then aggas2 was temperature - oscillated many times between 1060 ? and 900 ? . by tvtm , it made the ampoule less crack rate and the material much better
本论文用银( ag ) 、镓( ga ) 、硫( s )三种高纯单质元素，采用一种新的合成工艺路线? ?二温区气相输运温度振荡法，从低温区以热对流的方式输运硫蒸汽到高温区与银和镓反应生成aggas _ 2 ，降低了合成安瓿爆炸几率；并在熔点附近快速温度振荡从而提高多晶质量。