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Y. Li et al. /Materials Research bulletin 37(2002)1401-1409 (a) mixed powders (b)reduced powders (c)hot-pfessed body Fig. 2. XRD patterns of the Al2O3/30 vol. BN (a)mixed powders; (b)reduced powders and (c)hot- pressed body(●)aAl2O3;(口)tBN;(■)hBN:(◇) boric acid;(△)urea;(o) Sialon;(V) Al18B4O33L/ / N$7   %    ) (/0  #' 3 & & + #'  & & &  & #' -   & &, #' -  + #' -+ #' -+ #'  &+ #'  + #' 1+ #' *@< / *<)< )*   * +   !  , - .//0 1
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