Spectroscopic properties of untloped YAG and YAP grown under rediicing protective attilosphere were coinpared. Blue (with F centre) or brown (with 0-centre) varieties both of t h e inaterials were p r o p r e d in t h e dependence of t h e Al,O,:Y,O, ratio in t h e melt. Colour intensity depends on the H,O : H, ratio in t h o protective atmosphere and on t h e s i p of electrical potential above t h e melt luvel.Tho coloration limy he easily reunoved by an annealing at > 1200-1400 "C. All t h e irregularities of the colourations or their reinowing b>-annealing iriay lie attributed t o t h e presence of iinpurities.
E s werdcn spektroskopische Eigenschaften der undotiertcn i i n d unter retluziereiitlcr Atmosphiire geziichteten YAG und Y A P verglichen. Blaue (mit F-Zentren) odrr Iiraiine (rnit O--Zentreri) Varietiiten der heiden Materialien wurtlen in Abhiingigkoit volt1Alto, :Y,O,-Verhiiltriis i n der Schniclze gewonneri. Die I n t e n s i t i t der Fiirbung hiingt voiii H,O : H,-Vcrhiiltnis in der Schutxatinosphiire untl voiii Sinn tles elektr-ischeii Potcntials iilier der Sc:hinelzc al).Din Fiirbring karin iiian leicht bei einer Teitiperung h i > 1200-1400 'C entferrierr. Die Al~weichutigen tier Fiirbung oder der Fml)iinderring bei Temperlung inuW iinan allein tlcr Ariwcsrnkicit, von Verrinreinigringeri zuschreihrn.
Spectral properties of YAG and YAP grown in vacuum or under Ar-H, protective atmosphere were compared. The latter contained small amounts of argon which was detected by a laser mass spectral analysis. Ar impurity evokes brown colour of unannealed crystals and strenghtens anomalous red colour of annealed (particularly in 0,) YAP
Thermoluminescence (TL) of several types of corundum crystals is described. Undoped crystals showed a weak TL at 15 and 110°C with emission at 330 and 495 nm. Good TL response at 275°C is shown by Cr doped (0.03 wt%) crystals grown by Verneuil method in the oxygen cone of the flame annealed in hydrogen at 1500–1800°C.
The most intensive TL response is shown by crystals doped with Ti and Mo (∼ 10−3wt.%) grown by Czochralski method in reducing conditions. The former may be used to the detection of γ‐rays dose ≥ 10−3 − 10−2 Gy, the latter ≥ 10−7 − 10−6 Gy.
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