铬钇铝红色料的组成与结构的研究

STUDY ON THE COMOSITION AND STRUCTURE OF THE Cr-Y-Al RED PIGMENT

采用经典分析和仪器分析研究了铬钇铝红色料的化学组成 ,采用XRD和SEM研究了试样的矿物组成、微观组成和晶体结构 ,采用重力沉降法和激光法分析了试样的颗粒大小和组成 ,采用光电测色仪分析了试样的呈色特征和色度参数。本文还对铬钇铝红的呈色机理作了探讨。通过研究认为铬钇铝红是一种具有钙钛矿型结构的新型陶瓷色料 ,其主要化学组成是稀土氧化物Y2 O3 和三氧化二铝 (Al2 O3 ) ,Cr2 O3 作为着色氧化物引入。该色料的主晶相是钇铝榴石 (Al2 O3 ·Y2 O3 )占绝大多数 ,次晶相只占少量 ,有二钇铝榴石 ( 2Al2 O3 ·Y2 O3 )、萤石 (CaF2 )和刚玉 (α -Al2 O3 )等。铬钇铝红的着色机理可归因于Cr3 + 取代了钇铝榴石中的部分Al3 + 使晶格发生畸变 ,导致Cr3 + 的激发 ,对可见光谱选择性吸收后在 60 0 -70 0nm处形成特征反射带 。

This article respectively used the classics analysis and the instrumental analysis,XRD and SEM,the gravitational settling analysis method and the laser analysis method,the photoelectricity cryoscope to study the chemical composition,the mineral composition,the microscopic composition and the crystal structure of the Cr-Y-Al red pigment,to analyze the sample particle size and composition,the color generation characteristic and colorimetric parameter.This article also researched the Cr-Y-Al color generation mechanism.Through the research,we think that the Cr-Y-Al red pigment is a kind of new ceramic pigment that has the perovskite structure.Its main chemical composition are rare earths Y 2O 3 and aluminum oxide(Al 2O 3) and Cr 2O 3 is colour oxide.Its marjor crystal phase is the yttrium aluminum garnet (Al 2O 3·Y 2O 3) in the most and the inferior crystal phase is two yttriums aluminum garnet (2Al 2O 3·Y 2O 3),fluorspar(CaF 2) and corundum(a-Al 2O 3) and so on.The colour generation mechanism might is that:Cr 3+ substitutes for Al 3+ in yttrium aluminum granet and cause the crystal lattice to have the distortion and Cr 3+ stimulation,form the characteristic reflection band after the visible spectrum selective absorption in 600～700nm,then produce red colour.