Hydrothermal Synthesis and Mössbauer Spectra Study of Hydrogarnet Sr3Fe2(OH)12

Abstract

Abstract: A single phase hydrogarnet Sr₃Fe₂(OH)₁₂was synthesized from mild hydrothermal systems. For Sr₃Fe₂(OH)₁₂, the hydroxyl groups of Sr_OH dodecahedra were decomposed in the form of four water molecules around 573 K. On heating Sr-Fe hydrogarnet in air or oxygen, an oxidation process from Fe(Ⅲ) to Fe(Ⅳ) takes place. Valence variation of the framework ions Fe(Ⅲ) determined the decomposition process and the structural types of the products. Two octahedra of Fe(OH)₆in Sr-Fe hydrogarnet were first detected by combining Mössbauer spectra and XPS.

Key words: Hydrothermal synthesis, Hydrogarnet, Mö, ssbauer spectrum

CLC Number:

O611.64

TrendMD:

LI Guang-She, MAO Ya-Chun, LI Xi-Rong, ZHU Lian-Jie, FENG Shou-Hua. Hydrothermal Synthesis and Mössbauer Spectra Study of Hydrogarnet Sr₃Fe₂(OH)₁₂[J]. Chem. J. Chinese Universities, 1998, 19(8): 1195.

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Hydrothermal Synthesis and Mössbauer Spectra Study of Hydrogarnet Sr₃Fe₂(OH)₁₂

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