Espectroscopia de impedância e microestrutura de vitrocerâmicas Li1+x[Al xGe2-x(PO4) 3] condutoras por íons lítio

Cruz, Ana Milena; Rodrigues, Ana Cândida Martins

doi:10.1590/s0366-69132007000200012

Cited by 3 publications

(3 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, also in these cases, it was not possible to separate the grain and grain boundary contributions, since, increasing temperature the two semicircles vanished, again forming a distorted one [29]. The appearance of one or two semicircles in the impedance plots will be the subject of a further study.…”

Section: Electrical Conductivitymentioning

confidence: 95%

Controlled crystallization and ionic conductivity of a nanostructured LiAlGePO4 glass–ceramic

Cruz

Ferreira

Rodrigues

2009

Journal of Non-Crystalline Solids

View full text Add to dashboard Cite

a b s t r a c tA Li 1.5 [Al 0.5 Ge 1.5 (PO 4 ) 3 ] glass composition was subjected to several crystallization treatments to obtain glass-ceramics with controlled microstructures. The glass transition (T g ), crystallization onset (T x ) and melting (T m ) temperatures of the parent glass were characterized by differential scanning calorimetry (DSC). The glass has a reduced glass transition temperature T gr = T g /T m = 0.57 indicating the possibility of internal nucleation. This assumption was corroborated by the similar DSC crystallization peaks from monolithic and powder samples. The temperature of the maximum nucleation rate was estimated by DSC. Different microstructures were produced by double heat treatments, in which crystal nucleation was processed at the estimated temperature of maximum nucleation rate for different lengths of time. Crystals were subsequently grown at an intermediate temperature between T g and T x . Single phase glass-ceramics with Nasicon structures and grain sizes ranging from 220 nm to 8 lmwerethensynthesizedand the influence of the microstructure on the electrical conductivity was analysed. The results showed that the larger the average grain size, the higher the electrical conductivity. Controlled glass crystallization allowed for the synthesis of glass-ceramics with fine microstructures and higher electrical conductivity than those of ceramics with the same composition obtained by the classical sintering route and reported in literature.

show abstract

Section: Electrical Conductivitymentioning

confidence: 95%

Controlled crystallization and ionic conductivity of a nanostructured LiAlGePO4 glass–ceramic

Cruz

Ferreira

Rodrigues

2009

Journal of Non-Crystalline Solids

View full text Add to dashboard Cite

show abstract

“…A review of the most promising advances in lithium ion NASICON glass-ceramics is summarized in Table . ,,,,− ,,,,,,,,,,,,,,,− In this table, T g is the glass transition temperature, and T x is the onset for glass crystallization. In summary, using germanium and titanium as B (IV) cation characterize almost all the NASICON glass-ceramics already explored.…”

Section: Lithium Ion-containing Nasicon Glass-ceramicsmentioning

confidence: 99%

“…The used parameters of temperature and time for crystallization will influence the grain size, porosity, and content of secondary phases. Treatments for long periods with a single plateau, ,,,, more than one plateau, ,,,, or even without a plateau (in slow heating and cooling rates) were applied. The researchers mainly evaluate the effects of microstructure and composition on cationic transport number, ionic conductivity at room temperature, and also the stability against aqueous electrolytes or electrodes …”

Section: Lithium Ion-containing Nasicon Glass-ceramicsmentioning

confidence: 99%

Methods for Lithium Ion NASICON Preparation: From Solid-State Synthesis to Highly Conductive Glass-Ceramics

2020

View full text Add to dashboard Cite

Lithium ion-containing Na + Super Ionic Conductor (NASICON) electrolytes are important materials for new energystorage technologies. The NASICON abbreviation represents several compounds with similar structures applied as solid electrolytes, including those conductors of lithium ions. Different methods have been used to synthesize these materials, as well as innumerous other methods used to form the electrolyte in its final shape. The synthesis methods and processing techniques significantly affect the microstructure and conductivity of the electrolyte as a result. Therefore, this paper provides an overview of the main synthesis methods and processing techniques applied for lithium ion NASICON production. First, a general view of the NASICON structure and the variety of possible compositions will be discussed. Next, the influence of the synthesis methods (e.g., solid-state reaction, sol−gel, polymeric precursor, sol−gel/ electrospinning) and sintering techniques (e.g., conventional, microwave, and Spark Plasma Sintering) will be presented. A special topic will be devoted for glass-ceramics production and evaluation, based on their advantageous ionic conductivity and potentiality for practical use on a large-scale. Moreover, the current results for electrochemical cells simulating the application of these materials in batteries will be presented. Finally, a general point of view of the authors about the future for NASICON electrolytes will be provided, presenting oncoming trends for research.

show abstract

NASICON: Synthesis, Structure and Electrical Characterization

Ahmadu¹

2014

Advanced Sensor and Detection Materials

View full text Add to dashboard Cite

Espectroscopia de impedância e microestrutura de vitrocerâmicas Li1+x[Al xGe2-x(PO4) 3] condutoras por íons lítio

Cited by 3 publications

References 6 publications

Controlled crystallization and ionic conductivity of a nanostructured LiAlGePO4 glass–ceramic

Controlled crystallization and ionic conductivity of a nanostructured LiAlGePO4 glass–ceramic

Methods for Lithium Ion NASICON Preparation: From Solid-State Synthesis to Highly Conductive Glass-Ceramics

NASICON: Synthesis, Structure and Electrical Characterization

Contact Info

Product

Resources

About