TY - JOUR

T1 - The effect of the nanodiamonds additive on ionic conductivity of silver iodide

AU - Mateyshina, Yulia

AU - Alekseev, Dmitriy

AU - Uvarov, Nikolai

PY - 2019/10/1

Y1 - 2019/10/1

N2 - Composite solid electrolytes AgI-CND (CND is nanodiamonds powder) were prepared and their properties were investigated by methods of X-ray diffraction, differential scanning calorimetry (DSC) and impedance spectroscopy. It was found that the addition of CND results in a strong increase in the ionic conductivity of AgI at temperatures below phase transition to the α-AgI phase. According to the results of DSC, no strong changes in thermodynamic properties of the salt in the composites occur. Therefore, in contrast to the AgI-oxide composites, the most probable reason of the conductivity increase in AgI-CND composites is formation of stable network of intergrains and anti-phase domain boundaries acting as conductivity pathways in the composites. Due to the particle-reinforcement effect on nanodiamond particles the AgI matrix in the composites may undergo strong local stresses leading to the stabilization of the polytypes. The peaks of such phases are detected in X-ray diffractograms of the composites. The maximum conductivity of AgI-CND composites, 5.6·10-4 S/cm at 31 °C observed in the composites containing 80 mol % CND, is comparable to the best values obtained for oxide-based composites with silver iodide. Thus, nanodiamonds is the first non-oxide additive which caused a strong enhancement of the ionic conductivity of AgI low temperatures.

AB - Composite solid electrolytes AgI-CND (CND is nanodiamonds powder) were prepared and their properties were investigated by methods of X-ray diffraction, differential scanning calorimetry (DSC) and impedance spectroscopy. It was found that the addition of CND results in a strong increase in the ionic conductivity of AgI at temperatures below phase transition to the α-AgI phase. According to the results of DSC, no strong changes in thermodynamic properties of the salt in the composites occur. Therefore, in contrast to the AgI-oxide composites, the most probable reason of the conductivity increase in AgI-CND composites is formation of stable network of intergrains and anti-phase domain boundaries acting as conductivity pathways in the composites. Due to the particle-reinforcement effect on nanodiamond particles the AgI matrix in the composites may undergo strong local stresses leading to the stabilization of the polytypes. The peaks of such phases are detected in X-ray diffractograms of the composites. The maximum conductivity of AgI-CND composites, 5.6·10-4 S/cm at 31 °C observed in the composites containing 80 mol % CND, is comparable to the best values obtained for oxide-based composites with silver iodide. Thus, nanodiamonds is the first non-oxide additive which caused a strong enhancement of the ionic conductivity of AgI low temperatures.

KW - Article reinforcement effect

KW - Composite solid electrolyte

KW - Enhanced ionic conductivity

KW - Nanodiamonds

KW - Silver iodide

KW - ROOM-TEMPERATURE

KW - PHASES

KW - THERMODYNAMIC PROPERTIES

KW - AGI

KW - STABILIZATION

KW - COMPOSITES

KW - UNUSUAL TRANSPORT

KW - STRUCTURAL-PROPERTIES

UR - http://www.scopus.com/inward/record.url?scp=85086907003&partnerID=8YFLogxK

U2 - 10.1016/j.matpr.2019.12.094

DO - 10.1016/j.matpr.2019.12.094

M3 - Conference article

AN - SCOPUS:85086907003

VL - 25

SP - 373

EP - 376

JO - Materials Today: Proceedings

JF - Materials Today: Proceedings

SN - 2214-7853

T2 - 3rd All-Russian Conference, with International Participation Hot Topics of Solid State Chemistry : From New Ideas to New Materials, HTSSC 2019

Y2 - 1 October 2019 through 5 October 2019

ER -