Ferroelectricity of Ca9Fe(PO4)7 and Ca9Mn(PO4)7 ceramics with polar whitlockite-type crystal structure

Adem, Umut

doi:10.17776/csj.723752

Ferroelectricity of Ca9Fe(PO4)7 and Ca9Mn(PO4)7 ceramics with polar whitlockite-type crystal structure

Umut ADEM (İzmir Yüksek Teknoloji Enstitüsü, Malzeme Bilimi ve Mühendisliği Bölümü, İzmir, Türkiye)

Cumhuriyet Science Journal

3 0

Yıl: 2020 Cilt: 41 Sayı: 2 Sayfa Aralığı: 559 - 564 Metin Dili: İngilizce DOI: 10.17776/csj.723752 İndeks Tarihi: 19-12-2020

Ferroelectricity of Ca9Fe(PO4)7 and Ca9Mn(PO4)7 ceramics with polar whitlockite-type crystal structure

Öz:

Ca9Fe(PO4)7 is a member of the double phosphate family having polar whitlockite-typecrystal structure. The phase transition from the room temperature polar R3c to the hightemperature non-polar R c phase has been called a ferroelectric phase transition usingcomplementary experiments such as temperature dependent second harmonic generation anddielectric constant measurements however no ferroelectric hysteresis measurement has beenreported. In order to be able to call these polar materials ferroelectric, measurement of asaturated ferroelectric hysteresis loop is necessary to demonstrate that the electricalpolarization of these materials is switchable. In order to realize this goal, we havesynthesized Ca9Fe(PO4)7 as well as structurally identical Ca9Mn(PO4)7 using solid statesynthesis. Crystal structure of the ceramics were confirmed using Rietveld refinement of thex-ray diffraction (XRD) patterns. Differential scanning calorimetry (DSC) measurementsrevealed phase transition temperatures of 848 and 860 K for Ca9Fe(PO4)7 and Ca9Mn(PO4)7,respectively. Our ferroelectric hysteresis measurements and current electric field loops (I-E)derived from the hysteresis loops showed that the loops cannot be saturated and the directionof the electrical polarization of both materials cannot be switched up to the largest appliedelectric field of 100 kV/cm. Possible origins of this behaviour are discussed.

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APA	Adem U (2020). Ferroelectricity of Ca9Fe(PO4)7 and Ca9Mn(PO4)7 ceramics with polar whitlockite-type crystal structure. , 559 - 564. 10.17776/csj.723752
Chicago	Adem Umut Ferroelectricity of Ca9Fe(PO4)7 and Ca9Mn(PO4)7 ceramics with polar whitlockite-type crystal structure. (2020): 559 - 564. 10.17776/csj.723752
MLA	Adem Umut Ferroelectricity of Ca9Fe(PO4)7 and Ca9Mn(PO4)7 ceramics with polar whitlockite-type crystal structure. , 2020, ss.559 - 564. 10.17776/csj.723752
AMA	Adem U Ferroelectricity of Ca9Fe(PO4)7 and Ca9Mn(PO4)7 ceramics with polar whitlockite-type crystal structure. . 2020; 559 - 564. 10.17776/csj.723752
Vancouver	Adem U Ferroelectricity of Ca9Fe(PO4)7 and Ca9Mn(PO4)7 ceramics with polar whitlockite-type crystal structure. . 2020; 559 - 564. 10.17776/csj.723752
IEEE	Adem U "Ferroelectricity of Ca9Fe(PO4)7 and Ca9Mn(PO4)7 ceramics with polar whitlockite-type crystal structure." , ss.559 - 564, 2020. 10.17776/csj.723752
ISNAD	Adem, Umut. "Ferroelectricity of Ca9Fe(PO4)7 and Ca9Mn(PO4)7 ceramics with polar whitlockite-type crystal structure". (2020), 559-564. https://doi.org/10.17776/csj.723752

APA	Adem U (2020). Ferroelectricity of Ca9Fe(PO4)7 and Ca9Mn(PO4)7 ceramics with polar whitlockite-type crystal structure. Cumhuriyet Science Journal, 41(2), 559 - 564. 10.17776/csj.723752
Chicago	Adem Umut Ferroelectricity of Ca9Fe(PO4)7 and Ca9Mn(PO4)7 ceramics with polar whitlockite-type crystal structure. Cumhuriyet Science Journal 41, no.2 (2020): 559 - 564. 10.17776/csj.723752
MLA	Adem Umut Ferroelectricity of Ca9Fe(PO4)7 and Ca9Mn(PO4)7 ceramics with polar whitlockite-type crystal structure. Cumhuriyet Science Journal, vol.41, no.2, 2020, ss.559 - 564. 10.17776/csj.723752
AMA	Adem U Ferroelectricity of Ca9Fe(PO4)7 and Ca9Mn(PO4)7 ceramics with polar whitlockite-type crystal structure. Cumhuriyet Science Journal. 2020; 41(2): 559 - 564. 10.17776/csj.723752
Vancouver	Adem U Ferroelectricity of Ca9Fe(PO4)7 and Ca9Mn(PO4)7 ceramics with polar whitlockite-type crystal structure. Cumhuriyet Science Journal. 2020; 41(2): 559 - 564. 10.17776/csj.723752
IEEE	Adem U "Ferroelectricity of Ca9Fe(PO4)7 and Ca9Mn(PO4)7 ceramics with polar whitlockite-type crystal structure." Cumhuriyet Science Journal, 41, ss.559 - 564, 2020. 10.17776/csj.723752
ISNAD	Adem, Umut. "Ferroelectricity of Ca9Fe(PO4)7 and Ca9Mn(PO4)7 ceramics with polar whitlockite-type crystal structure". Cumhuriyet Science Journal 41/2 (2020), 559-564. https://doi.org/10.17776/csj.723752