结合X射线粉末衍射和差示扫描量热法,系统研究了不同格位上的掺杂对Ba3Y(BO3)3晶体的生长和相变的影响. 研究发现,相同掺杂浓度10at%时,掺Nd3+的α-Ba3Y(BO3)3晶体的相变温度(1099.6℃)比掺Yb3+的晶体的相变温度(1145.3℃)低;且随着掺Nd3+浓度的降低,晶体的相变温度升高,晶体在降温过程中更容易发生相变. 在晶体中掺入Sr2+离子,可以有效提高Yb3+∶α-Ba3Y(BO3)3晶体的稳定性. 随着Sr2+掺入浓度的增加,晶体的熔点升高,相变温度降低. 当Sr2+掺杂浓度为16at%时,晶体的相变峰消失;当Sr2+掺杂浓度分别为5at%、10at%时,晶体仍然发生相变.
Phase transition is harmful to the quality of Re doped Ba3Y(BO3)3 crystals. In order to obtain high quality Yb3+∶α-Ba3Y(BO3)3 crystal, Sr2+ ions co-doped Yb3+∶α-Ba3Y(BO3)3 crystal was grown with CZ method. Effect of various dopants and substitution sites on the growth and phase transition of Ba3Y(BO3)3 crystal were investigated. The phase transition temperature of 10at% Nd3+∶α-Ba3Y(BO3)3 crystal is 1099.6℃, which is lower than that of 10at% Yb3+∶α-Ba3Y(BO3)3 crystal (1145.3℃). Furthermore, the phase transition temperature of Nd3+∶α-Ba3Y(BO3)3 crystals is increased with the increase of the contentration of Nd3+ ions. For 10at%Yb3+∶α-Ba3Y(BO3)3 crystal, the melting point is increased and the phase transition temperature is decreased with the increase of the concentration of the codoped Sr2+ ions. The endothermic peak of phase transition disappears when the concentration of Sr2+ ions reaches 16at%, yet phase transition still exists with Sr2+ concentration of 5at% or 10at%.
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