本文研究了高温高压水热法合成α-Al2O3晶体的形状和表面形态.原料为Al(OH)3,矿化剂的浓度为1M KBr、0.1 M KOH,填充度35%, 温度388℃时,可部分自发生成α-Al2O3晶体.温度超过395℃以上,可全部转化成α-Al2O3晶体,晶体形状为六棱柱体,显露底面{0001}和柱面{21 10}、{1120}、{1210},晶体的表面呈现阶梯.在矿化剂为1M KOH,填充度35%,温度为380℃时,部分自发生成α-Al2O3晶体,晶体的底面{0001}和柱面{1120}消失,呈现双锥形;当温度达到395℃时,可全部转化成α-Al2O3晶体,晶体呈双锥形,晶面呈条状阶梯形;温度达到405℃以上,晶体又呈现六棱柱体.
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