### Abstract

A lattice gas model is suggested for describing the order-disorder transition of mobile particles in BCC cage lattices such as α-AgI, Ag _{2}S, NbH _{x}, etc. The effect of repulsive first- and second-neighbour interactions is studied by a six sub-lattice mean-field approximation. With a fixed number of mobile particles determined by the composition of AgI the mean-field approximation predicts that the disordering process strongly depends on the ratio of the second- and first-neighbour interactions. Beside the low-temperature ordered state and the high-temperature random distribution two further intermediate states are found to be stable. This fact results in three different kinds of disordering process. The results suggest a new interpretation of the alpha phase of AgI.

Original language | English |
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Pages (from-to) | 3775-3787 |

Number of pages | 13 |

Journal | Journal of Physics C: Solid State Physics |

Volume | 19 |

Issue number | 20 |

DOIs | |

Publication status | Published - júl. 20 1986 |

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### ASJC Scopus subject areas

- Physics and Astronomy(all)
- Condensed Matter Physics

### Cite this

**Lattice gas model on tetrahedral sites of a BCC lattice.** / Szabó, G.

Research output: Article

*Journal of Physics C: Solid State Physics*, vol. 19, no. 20, pp. 3775-3787. https://doi.org/10.1088/0022-3719/19/20/013

}

TY - JOUR

T1 - Lattice gas model on tetrahedral sites of a BCC lattice

AU - Szabó, G.

PY - 1986/7/20

Y1 - 1986/7/20

N2 - A lattice gas model is suggested for describing the order-disorder transition of mobile particles in BCC cage lattices such as α-AgI, Ag 2S, NbH x, etc. The effect of repulsive first- and second-neighbour interactions is studied by a six sub-lattice mean-field approximation. With a fixed number of mobile particles determined by the composition of AgI the mean-field approximation predicts that the disordering process strongly depends on the ratio of the second- and first-neighbour interactions. Beside the low-temperature ordered state and the high-temperature random distribution two further intermediate states are found to be stable. This fact results in three different kinds of disordering process. The results suggest a new interpretation of the alpha phase of AgI.

AB - A lattice gas model is suggested for describing the order-disorder transition of mobile particles in BCC cage lattices such as α-AgI, Ag 2S, NbH x, etc. The effect of repulsive first- and second-neighbour interactions is studied by a six sub-lattice mean-field approximation. With a fixed number of mobile particles determined by the composition of AgI the mean-field approximation predicts that the disordering process strongly depends on the ratio of the second- and first-neighbour interactions. Beside the low-temperature ordered state and the high-temperature random distribution two further intermediate states are found to be stable. This fact results in three different kinds of disordering process. The results suggest a new interpretation of the alpha phase of AgI.

UR - http://www.scopus.com/inward/record.url?scp=4143102877&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=4143102877&partnerID=8YFLogxK

U2 - 10.1088/0022-3719/19/20/013

DO - 10.1088/0022-3719/19/20/013

M3 - Article

AN - SCOPUS:4143102877

VL - 19

SP - 3775

EP - 3787

JO - Journal of Physics Condensed Matter

JF - Journal of Physics Condensed Matter

SN - 0953-8984

IS - 20

ER -