INFRARED-SPECTROSCOPY OF YTTRIUM ALUMINUM, YTTRIUM GALLIUM, AND YTTRIUM IRON GARNETS
INFRARED-SPECTROSCOPY OF YTTRIUM ALUMINUM, YTTRIUM GALLIUM, AND YTTRIUM IRON GARNETS
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DOI：
10.1063/1.351846
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发表时间：
1992-07-15
影响因子：
3.2
通讯作者：
CAMPBELL, KR
中科院分区：
文献类型：
--
作者：
HOFMEISTER, AM;CAMPBELL, KR
所有17个红外晶格模式的钇铝，钇镓，和钇铁石榴石Y3 R2（RO 4）3从单晶反射和吸收光谱，粉末技术。根据石榴石之间及相关系列内的化学替代关系，确定了12种模式的对应关系。与钇的平移相关的模式的频率在整个系列中几乎是恒定的。所有其他模式的频率随着单元体积的增加而准线性地减小。值的高，低频率的介电常数是在良好的协议与独立的测量，也Lyddane-Sachs-Teller关系被发现持有。使用Brout公式的修改从振动光谱计算体积模量与K（T）的实验值线性相关。
All 17 infrared lattice modes for yttrium aluminum, yttrium gallium, and yttrium iron garnets Y3R2(RO4)3 are obtained from single-crystal reflection and absorption spectroscopy, and the powder technique. Assignments for 12 modes are firmly establish based on chemical substitution among these garnets and within related series. Frequencies of the modes associated with translation of yttrium are nearly constant across the series. Frequencies of all other modes decrease quasilinearly as cell volume increases. Values the high and low frequency dielectric constants are in good agreement with independent measurements; also, the Lyddane-Sachs-Teller relationship was found to hold. Calculations of bulk moduli from vibrational spectra using a modification of Brout's formula linearly correlate with experimental values for K(T).