Pişkin, Cerem

Profile URL
https://hdl.handle.net/11147/15896
Name Variants
C. Piskin
Piskin, C.
Piskin, Cerem.
Job Title
Email Address
Main Affiliation
01. Izmir Institute of Technology
Status
External
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ORCID ID
Scopus Author ID
Turkish CoHE Profile ID
Google Scholar ID
WoS Researcher ID

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Scholarly Output

3

Articles

2

Views / Downloads

5271/838

Supervised MSc Theses

1

Supervised PhD Theses

0

WoS Citation Count

30

Scopus Citation Count

30

Patents

0

Projects

0

WoS Citations per Publication

10.00

Scopus Citations per Publication

10.00

Open Access Source

1

Supervised Theses

1

JournalCount
Journal of the American Ceramic Society1
Scripta Materialia1
Current Page: 1 / 1

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Author of Publication: search.filters.isAuthorOfPublication.821764e6-b30f-4695-9c1a-dca68a675b01

Scholarly Output Search Results

Now showing 1 - 3 of 3
  • Article
    Citation - WoS: 7
    Citation - Scopus: 7
    Hydrothermal Synthesis of Potassium–sodium Niobate Powders
    (Wiley, 2022) Karacasulu, Levent; Karacasulu, Levent; Ischia, Gloria; Pişkin, Cerem; Ahmetoğlu, Çekdar Vakıf; Ahmetoğlu, Çekdar Vakıf; 03.09. Department of Materials Science and Engineering; 01. Izmir Institute of Technology; 01.01. Units Affiliated to the Rectorate; 03. Faculty of Engineering
    Potassium–sodium niobates (KxNa1−xNbO3, 0 < x < 1, KNN) were hydrothermally synthesized under varying alkaline ratios (K+/Na+), total hydroxide concentration, reaction temperature, and time. Compositional surveys were developed by using Rietveld analyses derived quantitative volume fractions. The data demonstrated that phase pure KNN synthesis can be achieved by reacting the niobium source with the hydroxide solution having 6 M total hydroxide concentration, cation ratio (K+/Na+) of above 6 at temperatures ≥200°C for 24 h. Dissolution–precipitation events through intermediate products including hexaniobates were postulated as a plausible formation mechanism. It was shown also that the single-phase KNN approaching the morphotropic phase boundary (MPB) could be obtained by further incorporation of sodium ions into the crystal via post-annealing at 800°C/2 h, following the hydrothermal synthesis.
  • Article
    Citation - WoS: 23
    Citation - Scopus: 23
    Cold Sintering of Soda-Lime Glass
    (Elsevier Ltd., 2021) Karacasulu, Levent; Karacasulu, Levent; Ögür, Ezgi; Ahmetoğlu, Çekdar Vakıf; Pişkin, Cerem; Pişkin, Cerem; Vakıfahmetoğlu, Çekdar; 03.09. Department of Materials Science and Engineering; 01. Izmir Institute of Technology; 01.01. Units Affiliated to the Rectorate; 03. Faculty of Engineering
    Ordinary recycled soda lime glass powder was densified via cold sintering process with the aid of concentrated NaOH solution. Increase in processing time, temperature and concentration of the NaOH solution resulted in the formation of monolithic glass artifacts with higher relative densities. The sample densified the most (95.2%) was obtained when the sintering was performed at 250˚C with a 20 min dwell time using 15 M NaOH solution.
  • Master Thesis
    Comparison of Powder Synthesis Methods for the Production of Potassium Sodium Niobate (knn)
    (Izmir Institute of Technology, 2021) Pişkin, Cerem; Ahmetoğlu, Çekdar Vakıf; Adem, Umut; Ahmetoğlu, Çekdar Vakıf; Adem, Umut; 03.09. Department of Materials Science and Engineering; 01. Izmir Institute of Technology; 03. Faculty of Engineering
    Alkali niobate-based, i.e., potassium sodium niobate, KxNax-1NbO3 at x=0.5 (the composition at the morphotropic phase boundary (MPB)), based materials have been reported as promising lead-free piezoelectrics to be substituted with the most extensive lead-based, i.e., lead zirconate titanate (PZT) ones. In this thesis, KNN particles were obtained using three discrete powder synthesis routes: conventional solid-state reaction, hydrothermal synthesis, and sol-gel processing. The as-synthesized powders were characterized via several techniques to provide a comparative study and underline the difficulties upon KNN synthesis. In the conventional method, the phase pure K0.5Na0.5NbO3 powders were obtained at 850°C with 382 ∓ 68 nm particle size. Unfortunately, the process cannot be considered sustainable due to the high risk of non-perovskite impurity phase formations. Also, the results demonstrated that single phase KNN powder having the MPB composition could not be accomplished via a one-step hydrothermal reaction process because of the inevitable formation of the second NaNbO3 phase. Instead, post-heat treatment of biphasic (K-rich (x>0.5) KNN and NaNbO3) samples lead to induction of sodium incorporation into the crystal lattice, and eventually, phase-pure KNN particles with high proximity (x=0.58) to MPB were achieved. The KNN powder with the smallest particle size (145 nm) was obtained using the sol-gel method at 500°C. However, the samples showed carbonate impurities resulting from the reaction of unreacted alkali cations (K+ and/or Na+) with the ambient CO2. Hence, the KNN samples needed to be stored under inert atmosphere to ensure purity.