Some high-pressure transformations of geophysical significance

摘要: The consti tut ion of the mantle between depths 400 and 900 km is s t rongly influenced by occ u r ence a e i major phase n f o mat ions , nature which has been nves gated in this l abora to ry for v y [1]. A technique proved cons iderab le value an invest igat tab es ruc tu ra analogues (pa cu la ly germana tes ) common ca te m at high p . These have requent found new dense phases much lower than cor responding c cont inuation approach epo ed resen paper repara samples h g desc ibed epa red subjected range varying 100 250 kb, approx imate 900oc ighp apparatus This de vice ted essen pair Br idgman anvi ls with hea laced them [2]. Aft complet run sample was quenched under d examined opt ica X techniques. P on obtained known load anv ace together cal rmined co ec gradient edge center anvil measur ing equ obtain shov rans cen ter In accordance su Stishov [3] NaC1 scale J et al. [4], taken as 92 kb. Lengths most runs va 3 5 minutes Two percen water added fac ta reac these short imes exp were econna sance type, imed rmin success stable ans fo rma occur