| 摘要 |
PCT No. PCT/FR96/00255 Sec. 371 Date Feb. 25, 1997 Sec. 102(e) Date Feb. 25, 1997 PCT Filed Feb. 16, 1996 PCT Pub. No. WO96/26464 PCT Pub. Date Aug. 29, 1996Non-linear single crystal obtained by crystallization of a congruent molten composition of general formula:M4LnO(BO3)3in which: M is Ca, or Ca partially substituted with Sr or Ba; Ln is one of the lanthanides of the group comprising Y, Gd, La and Lu. |
