岫玉的穆斯鲍尔谱、电子顺磁共振谱和红外光谱特征  

M■SSBAUER, EPR AND IR SPECTROSCOPIC CHARACTERISTICS OF XIUYAN JADE

作　　者：曹俊臣[1] 阚学敏[1] 温桂兰 许荣旗 

机构地区：[1]中国科学院地质新技术研究所,广州510640

出　　处：《矿物学报》1994年第3期292-297,共6页Acta Mineralogica Sinica

摘　　要：本文采用X射线衍射、化学分析、穆斯鲍尔诺、EPR谱和红外光谱，对不同颜色的岫岩玉（岫玉）进行了测试。测试结果如下：绿色岫玉主要由叶蛇纹石组成，黄色岫玉由叶蛇纹石和利蛇纹石组成。穆斯鲍尔谱显示出Fe2＋和Fe3＋的两个双吸收特征。Fe2＋：化学位移为1．122mm／s，四极分裂为2.701～2.721mm／s，占据八面体位置；Fe3＋：化学位移为0．155～0.355mm／s，四极矩为0．337～0．470mm／s，占据四面体位置。电子顺磁共振谱显示出中心场0．336T附近，存在一个具有超精细结构的六重吸收，g≈2．0，与处于八面体上的高自旋Mn2＋有关。在低场区（0．16T附近），出现两个吸收线，g分别为4．29和3．88，与处于四面体位置的Fe3＋有关。红外光谱显示出与叶蛇纹石有关的OH－振动吸收带（3665～3670cm－1）；在3690～3680cm－1间显示出与利蛇纹石有关的吸收肩。1070，980cm－1出现Si－O振动吸收，另尚有5个吸收带（610，560，445，400，300cm－1）。随着绿色的加重和质量的提高，岫玉中Fe2＋和Mn2＋的浓度也增加。证实了岫玉的绿色与Fe2＋→Fe3＋的荷移有关，岫玉的黄色与O2－→Fe3＋荷移有关。Xiuyan jade samples of different colors were examined by X-ray diffraction, chemical analysis, Mossbauer spectrometry, EPR and IR spectroscopy.The green Xiuyan jade consists of antigorite and yellow one, lizardite.The Mossbauer spectra display two double-absorption characteristics of Fe2＋and Fe3＋. For Fe2＋, its chemical shift is 1. 122~1.143 (mm/s), quadrupole splitting is 2. 701~2.721 (mm/s),and it occupies the octahedron position. For Fe3+ its chemical shift is 0. 155 ~ 0. 355 (mm/s),quadrupole splitting is 0. 337~0. 470 (mm/s), and it occupies the tetrahedron position.The EPR spectra show that near 3360 G there appear the sixtet absorption spectra indicating the superfine structure, g≈2. 0, which are connected with high-spin Mn2＋ located in the octahedron. In the low-field range (near 0. 16 T) there are two absorption lines, g = 4. 29 and 3. 88,whidh are connected with Fe3+ located in the tetrahedron.The IR spectra display an absorption bahd of OH－ (3665~ 3670cm－1 ), which is connected with the antigorite. The absorption shoulder appears at 3690~3680cm－1, which is connected with the lizardite. The vibration absorption of Si-O at 1070, 980cm－1 and five absorption bands at 610,445, 400, 300m－1 are observed.With enchancing green colour and increasing quality, the concentratons of Fe3＋ and Mn2＋would increase, too. This indicates that the green color of Xiuyan jade is connected with the charge transfer of Fe2＋ →Fe3＋. The yellow color of Xiuyan jade is connected with the charge transfer of O2－→Fe3＋.

关 键 词：岫岩玉 穆斯堡尔谱 电子顺磁共振 

分 类 号：P575.4[天文地球—矿物学]