Gas–Solid Exchange Reaction: Zinc Vapor and Polycrystalline Zinc Orthosilicate

Abstract

The exchange kinetics of zinc vapor with polycrystalline zinc orthosilicate have been studied in a static system in the temperature range 760–1000 °C.The kinetic data reveal two rate laws. The initial rate is assigned to a transport step, i.e. mobility of zinc with D = 10−8 exp (−34 ± 5 kcal/RT ) cm2 s−1. The rate at high annealing times is a composite of the initial rate and a particle growth process, e.g. sintering.