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    • 8. 发明专利
    • Bi-SUBSTITUTED RARE EARTH IRON GARNET SINGLE CRYSTAL, METHOD FOR PRODUCING SAME AND OPTICAL DEVICE
    • 双重选择的稀土红土GARNET单晶,其生产方法和光学器件
    • JP2012012283A
    • 2012-01-19
    • JP2010286830
    • 2010-12-23
    • Namiki Precision Jewel Co Ltd並木精密宝石株式会社
    • SHIRAKI KENICHIFUKUHARA TAKASHINARITA KENJI
    • C30B29/28C30B19/04H01F1/34
    • C01G49/02C01G49/0018C01G49/0054C01P2002/52C01P2002/54C30B19/02C30B29/28G02F1/09H01F10/24
    • PROBLEM TO BE SOLVED: To provide a garnet single crystal which contains no lead while using a crucible made of platinum, is free from deterioration in quality and rich in mass-productivity, and has an insertion loss of ≤0.10 dB.SOLUTION: A Bi-substituted rare earth iron garnet single crystal has a composition represented by RBiFeAO(wherein, R must contain Gd, and may optionally contain at least one rare earth element; A represents at least one element selected from a group consisting of Ga, Al, In, or the like; x is >0.7 and ≤1.5; and w is >0 and ≤1.5), does not contain Pb but contains Pt, and contains Mn or at least one element of the group II elements. When Mn or the at least one element of the group II elements is expressed as M, the concentration (atppm) of M in the Bi-substituted rare earth iron garnet single crystal is expressed as [M], and the concentration (atppm) of Pt is expressed as [Pt], and further, the relational expression Δ of [M] and [Pt] is represented as Δ=(0.8[M])-[Pt], the value of Δ is set to be within the range of -0.34 to 2.87 atppm.
    • 要解决的问题:为了提供在使用铂制坩埚时不含铅的石榴石单晶,其质量没有劣化并且生产率高,并且具有≤0.10dB的插入损耗。 解决方案:双取代稀土铁石榴石单晶具有由R 3-x Bi x 12 (其中,R必须包含 Gd,并且可以任选地含有至少一种稀土元素; A表示选自由Ga,Al,In等组成的组中的至少一种元素; x> 0.7和≤1.5;并且w> 0和≤ 1.5),不含Pb但含有Pt,并含有Mn或II族元素的至少一种元素。 当Mn或II族元素中的至少一种元素表示为M时,Bi取代稀土铁石榴石单晶中M的浓度(atppm)表示为[M],浓度(atppm)表示为 Pt表示为[Pt],此外,[M]和[Pt]的关系式Δ表示为Δ=(0.8 [M]) - [Pt],Δ的值被设定在范围 为-0.34至2.87 atppm。 版权所有(C)2012,JPO&INPIT