We present the results of quality factor measurements for rod samples made of fused silica. To decrease the dissipation we annealed our samples. The highest quality factor that we observed was Q = (2.03 ± 0.01) × 10 8 for a mode at 384 Hz. This is the highest published value of Q in fused silica measured to date.

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Disordered Structures of Rare-Earth Scandoborates of the HuntiteFamily.-Single crystals of solid solutions of huntite-type scandoborates (Ln 1 ,Ln 2 )(Lu,Sc) 3 (BO 3 ) 4 (Ln 1 : La, Ce, Nd; Ln 2 : Nd, Gd, Y) are grown and subjected to detailed X-ray and crystallo-chemical analyses. An irregular and disordered structure of these solid solutions is established. -(KUZ'MICHEVA, G. M.; RYBAKOV, V. B.; NOVIKOV, S. G.; AGEEV, A. YU.; KUTOVOI, S. A.; KUZ'MIN, O. V.; Zh. Neorg. Khim. 44 (1999) 3, 352-366; Moskovskii gos. akad. tonkoi khim. tekhnol. im. Lomonosova, Moskva, Russia; RU)