Pressure Induced Amorphization of Antiferromagnetic FePO_4 and Fe(OH)_2
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X-ray diffraction studies were performed in b-FePO<SUB>4</SUB> and Fe (OH) <SUB>2</SUB> In FePO<SUB>4</SUB>, at P=2. 5 (5) GPa, a transformation to a coexisting new crystalline and amorphous phase is observed with about equal abundance. The crystalline phase is identified as VCrO<SUB>4</SUB>-type where Fe<SUP>III</SUP> and P<SUP>V</SUP> ions, are six-fold and four-fold coordinated, respectively. The pressure cycle is hysterectic. The onset of pressure-induced amorphization in Fe (OH) <SUB>2</SUB> is at ∼ 1 GPa however is incomplete to the highest pressure (P ∼ 24 GPa). Evidence exists that anisotropic, short-range-order is involved in the amorphization process.
- The Review of High Pressure Science and Technology
The Review of High Pressure Science and Technology 7, 356-358, 1998
The Japan Society of High Pressure Science and Technology