Specific Heat of an Ising Linear-Chain Crystal

Structural and Spectroscopic Study of the (Mg, Ni)2(OH)(AsO4) Arsenates

“…Most of the studies in these systems were carried out on mineral samples (10,11). However, hydrothermal techniques could be used in the preparation of these kinds of compounds giving rise to new phases with interesting structural characteristics and physical properties.…”

Hydrothermal Synthesis at High Pressure and Temperature of the Mg 7.5 Ni 6 H 3 (AsO 4 ) 8 (OH) 6 and Mg 8 Ni 4 H 6 (PO 4 ) 8 (OH) 6 Compounds

“…In this work we report on the hydrothermal synthesis, structural characterization and spectroscopic and magnetic properties of the Mg 7.5 Ni 6 H 3 (AsO 4 ) 8 (OH) 6 and Mg 8 Ni 4 H 6 (PO 4 ) 8 (OH) 6 compounds, whose crystal structure is related to that of the dumortierite mineral. 6 and Mg 8 Ni 4 H 6 (PO 4 ) 8 (OH) 6 compounds were prepared using hydrothermal conditions.…”

“…[3,4]. An important part of these studies was carried out on mineral samples [5,6]. So, the preparation of phosphates and arsenates by hydrothermal techniques is an alternative way to obtain materials related to minerals.…”

“…6 and Mg 8 Ni 4 H 6 (PO 4 ) 8 (OH) 6 compounds were prepared using hydrothermal conditions. The (Mg,Ni) 3 (XO 4 ) 2 Á 8H 2 O (X ¼ P, As) phases [7] were used as starting materials.…”

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The Mg 7.5 Ni 6 H 3 (AsO 4 ) 8 (OH) 6 and Mg 8 Ni 4 H 6 (PO 4 ) 8 (OH) 6 compounds have been synthesized by using hydrothermal techniques at high pressure and temperature. The crystal structure of the arsenate phase has been refined with the Rietveld method.

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