The bond ionicity in RBa2Cu3O7 (R=Pr, Sm, Eu, Gd, Dy, Y, Ho, Er, Tm)

RBa2Cu3O7 (R = Pr, Sm, Eu, Gd, Dy, Y, Ho, Er, Tm) has been studied using complex chemical bond theory. The results indicated that with the decreasing of R radius, the ionicities for all considered types of bond decrease. This is in good agreement with the experimental fact that T-c decreases with the decreasing of R radius. PrBa2Cu3O7 with no Ba-site Pr in this calculation is also predicted to be a superconductor. This supports the conclusion obtained by Blackstead et al. The ionicity for each bond obeys the following order: Ba-O > R-O > Cu(2)-O(1) > Cu(2)-O(2,3) > Cu(1)-O(4) similar to Cu(1)-O(1).

LiMgAlF_6 : Tm~(3+) 的合成与光谱特性

采用高温固相反应法，ＬｉＦ／ＭｇＦ２／ＡｌＦ３＝１２０／１１０／１００，烧结温度为１００８Ｋ，烧结时间为４ｈ，在流动的高纯Ａｒ中合成了ＬｉＭｇＡｌＦ６：Ｔｍ３＋。对其结构和发光特性进行了研究。

一种新型的Nd：YAP激光眼科治疗机及临床应用

报导一种新型的Ｎｄ：ＹＡＰ激光眼科治疗机。应用于临床，对膜性白内障、青光眼等眼病的治疗取得较满意的治疗效果。

YP_5O_(14):Er~(3+),Tm~(3+)晶体的合成

研究了水热法合成晶体,浓度配比、生长温度对晶体生长习性的影响.合成了一系列化学计量比的Y_(1-x-0.3)Er_(0.3)Tm_xP_5O_(14)(x=0.01～0.1)晶体,观察和分析了晶体的缺陷及成因,测定和讨论了晶体结构.

钙钛矿型铝酸钇(YAP)晶体在还原气氛中的稳定性

关于YAP的相文献上有不同的报导。相图研究说明,在较低温度它将分解成YAG(Y_3Al_5O_(12))和YAM(Y_4Al_2O_9)。Abell等报导分解产物是YAG和未鉴别出来的x相,并推测可能是体系缺氧,而x相不能表示在膺二元体系相图中。我们认为在还原气氛中YAP是不稳定的。本文对石墨加热器处理的YAP晶体粉末通过化学分析和x线相分析进一步证实此推论。