采用SEM和TEM对河蚌壳的珍珠层和棱柱层进行了研究,结果表明:珍珠层呈砖墙结构,珍珠层的文石小板片呈不规则多边形,是由纳米级矿物岛组成的多晶体;文石小板片之间观察到了矿物桥的存在,呈随机分布;在珍珠层与棱柱层之间存在一个过渡区.采用XRD对河蚌壳的珍珠层和棱柱层的结晶取向进行分析,结果表明珍珠层除了在(002)晶面上具有非常明显的择优取向外,同时在(014)、(012)等晶面上也存在一定的择优取向性.通过DTA和TG实验对河蚌壳的相变行为进行了研究,发现蚌壳中文石相在有机质的影响下,其相转变温度(360～380℃)与天然文石(450～500℃)相比要低.
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