Abstract

Raman spectra and mid-range and far infrared spectra have been measured on polycrystalline norsethite [BaMg(C03)2], barytocalcite [BaCa(CO3)2], the high-temperature modification of barytocalcite, huntite [CaMg3(C03)4], benstonite [Ca7Ba6(CO3)i3], and alstonite [CaBa(CO3)2], Factor-group calculations permit the assignment of the internal modes of the known structures. Effects of ordering in these derivative structures appear mainly in the IR spectra. A degree of translational disorder in the high-temperature modification of barytocalcite and in alstonite appears as a line broadening of the symmetric stretching mode in the Raman spectra.

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