New silver superionic conductors Ag7XY5Z (X = Si, Ge, Sn; Y = S, Se; Z = Cl, Br, I)-synthesis and electrical studies

Laqibi, M.; Cros, B.; Peytavin, S.; Ribes, M.

doi:10.1016/0167-2738(87)90077-4

Cited by 73 publications

(23 citation statements)

References 7 publications

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“…The electrical conductivity of glassy and crystalline samples was measured in the temperature range 250-495 K (±2 K) by the dc probe method in argon at a pressure of ~10 5 Pa. Three types of electrochemical cell (ECC) were used in the measurements: Ag|sample|Ag (a), Ag|sample|Ag 3 SBr|Ag (b), and Ag|sample|Ag 3 SI|Ag (c) with Ag|(Ag+Ag 3 SBr)|sample probes, where (Ag+Ag 3 SBr) means a mechanical mixture of finely dispersed silver with silver sulfidebromide. Such a mixture provides ohmic contact with the sample.…”

Section: Conductivity Measurementsmentioning

confidence: 99%

“…Thus, 116 tetrahedral sites remain unoccupied. According to the classical model for the high ionic conductivity of argyrodites [5,[28][29][30], these unoccupied tetrahedral sites serve as pathways for the jumping migration process of the Cu + -or Ag + -cations. High displacement parameters and partial site occupancies are observed for Cu + and Ag + , i.e.…”

Section: Crystal Structure Of IIImentioning

confidence: 99%

“…The parameters of conductivity σ and ∆Е allow assigning both I and II to the class of superionic materials. The formation of the Ag 7 GeS 5 Br compound [4,5] was not confirmed in [2]. The T-x space of the Ag 2 S-GeS 2 -AgBr plane in the Ag 2 GeS 3 -GeS 2 -AgBr region remains unexplored.…”

Section: Introductionmentioning

confidence: 98%

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Ag3Ge2S5Br: Synthesis, structure and ionic conductivity

Moroz¹,

Demchenko²,

Ромака³

et al. 2014

Chem. Met. Alloys

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A new compound, Ag 3 Ge 2 S 5 Br, was found on the intersection of the Ag 3 SBr-GeS 2 and Ag 2 Ge 2 S 5-AgBr polythermal cross-sections of the Ag 2 S-GeS 2-AgBr system. The peritectic process L + GeS 2 ↔ ↔ ↔ ↔ Ag 3 Ge 2 S 5 Br takes place at T = 727 K. The crystal structure of Ag 3 Ge 2 S 5 Br was solved and refined using X-ray powder diffraction data: own structure type, space group P2 1 3-b 2 a 5 , Pearson symbol cP44, Z = 4, a = 10.16702(7) Å, R I = 0.0395, χ χ χ χ 2 = 3.19. Ag 3 Ge 2 S 5 Br was also obtained in the glassy state. The charge and mass transfer of the crystalline and glassy phases was investigated by the dc probe method between 250 and 495 K. The samples are purely ionic (Ag + , Br-) conductors. The influence of lining of the transport channels by the halogens (Br-, Ion on the conductivity of crystalline (Ag 3 Ge 2 S 5 Br + 10 wt.% GeS 2) and glassy (Ag 3 Ge 2 S 5 Br) samples was studied. Electronic structure calculations (FP-LAPW method) support the experimental results.

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Section: Conductivity Measurementsmentioning

confidence: 99%

Section: Crystal Structure Of IIImentioning

confidence: 99%

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Ag3Ge2S5Br: Synthesis, structure and ionic conductivity

Moroz¹,

Demchenko²,

Ромака³

et al. 2014

Chem. Met. Alloys

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“…The most extensively studied among the compounds of this family are Cu 6 PS 5 I crystals which, besides high ionic conductivity, possess ferroelastic and nonlinear optical properties [2,3]. Silver-containing analogues, Ag 7 Ge(Si)S 5 I fast-ion conductors, show pure ionic conductivity [4]. Some electrochemical, electrical and optical properties of Cu 7 GeS 5 I crystals are reported in Refs.…”

Section: Introductionmentioning

confidence: 99%

Crystal growth and phase interaction studies in the Cu7GeS5I–Cu7SiS5I superionic system

Studenyak

Кохан

Kranjčec

et al. 2007

Journal of Crystal Growth

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“…Information about temperature and composition ranges is limited. The parameters of the conductivity allow assigning Ag 7 GeS 5 Br to the class of superionic materials [2,3].…”

Section: Introductionmentioning

confidence: 99%

Phase relations along the Ag8GeS6–[(AgBr)4·GeS2] cross-section. Crystal structure and electric conductivity of Ag6GeS4Br2 in bulk

Moroz¹,

Demchenko²,

Akselrud³

et al. 2010

Chem. Met. Alloys

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The Т-х-diagram of the Ag 8 GeS 6-[((((AgBr) 4 •GeS 2 ] polythermal cross-section has been constructed in the range 25-100 mol.%Ag 8 GeS 6. The conditions for solid-state synthesis of the Ag 6 GeS 4 Br 2 quaternary phase have been established. The crystal structure of Ag 6 GeS 4 Br 2 (Pnma-d 8 c 7 a, oP96-44.24, Z = 4, a = 6.53892(5), b = 7.72656(5), c = 22.90338(17) Å; X-ray powder diffraction, 820 reflections measured, 58 parameters refined, R I = 0.0383, R p = 0.0408, R wp = 0.0528, χ 2 = 1.76) is a disordered variant of the structure determined previously on single crystal data. The electrical conductivity of Ag 6 GeS 4 Br 2 has been measured by the dc probe method between 250 and 410 K. A model for the superionic electrical conduction mechanism is proposed.

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New silver superionic conductors Ag7XY5Z (X = Si, Ge, Sn; Y = S, Se; Z = Cl, Br, I)-synthesis and electrical studies

Cited by 73 publications

References 7 publications

Ag3Ge2S5Br: Synthesis, structure and ionic conductivity

Ag3Ge2S5Br: Synthesis, structure and ionic conductivity

Crystal growth and phase interaction studies in the Cu7GeS5I–Cu7SiS5I superionic system

Phase relations along the Ag8GeS6–[(AgBr)4·GeS2] cross-section. Crystal structure and electric conductivity of Ag6GeS4Br2 in bulk

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