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Solid–Solid Solutions

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The temperature-composition phase diagram of two solids, A and B, which are immiscible in the solid phase but form miscible liquids, shows that when the temperature is low, these two exist as separate, pure solids (A and B). As the temperature increases, they transition into a single-phase liquid solution where A and B coexist. Moving from point a1 to a2 in the phase diagram, the composition changes such that solid B begins to separate from the solution, enriching the remaining liquid with A.

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Updated: Jun 5, 2026

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of Chalcogenidoplumbates(II or IV)

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Published on: December 29, 2016

The solid solution Na(0.39)(NH(4))(1.61)SO(4)·Te(OH)(6).

Lilia Ktari, Mohamed Abdelhedi, Mohamed Dammak

Acta Crystallographica. Section E, Structure Reports Online

|January 5, 2011

Summary

This study details the crystal structure of sodium ammonium sulfate-telluric acid, revealing its composition and arrangement. The structure features alternating planes of telluric acid and sulfate groups, with cations located between these layers.

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Area of Science:

Inorganic Chemistry
Crystallography
Solid-State Chemistry

Background:

Solid solutions of the type M(1-x)(NH4)xSO4·Te(OH)6, where M represents alkali metals (K, Rb, Cs), are known.
These compounds exhibit interesting structural and chemical properties due to the partial substitution of ammonium ions by alkali metal cations.

Purpose of the Study:

To determine the crystal structure of the title compound, sodium ammonium sulfate-telluric acid (1/1), Na(0.39)(NH4)(1.61)SO4·Te(OH)6.
To understand the structural relationship with other known solid solutions in the M(1-x)(NH4)xSO4·Te(OH)6 series.

Main Methods:

Single-crystal X-ray diffraction analysis was employed to elucidate the crystal structure.
Structural characterization involved identifying atomic positions, coordination environments, and bonding interactions.

Main Results:

The compound Na(0.39)(NH4)(1.61)SO4·Te(OH)6 is isostructural with other members of the M(1-x)(NH4)xSO4·Te(OH)6 series.
The crystal structure consists of alternating planes of telluric acid [Te(OH)6] octahedra and sulfate (SO4) tetrahedra.
Sodium (Na+) and ammonium (NH4+) cations are statistically distributed in the same crystallographic site located between these planes.
Hydrogen bonding (O-H⋯O and N-H⋯O) plays a crucial role in stabilizing the overall structure.

Conclusions:

The structural characterization confirms the partial substitution of ammonium by sodium in the sulfate-telluric acid framework.
The findings contribute to the understanding of solid solution formation and structural diversity in inorganic compounds.
The identified hydrogen bonding network highlights the importance of non-covalent interactions in stabilizing complex crystal structures.