Details
| Originalsprache | Englisch |
|---|---|
| Aufsatznummer | 035403 |
| Fachzeitschrift | Journal of Physics Condensed Matter |
| Jahrgang | 30 |
| Ausgabenummer | 3 |
| Publikationsstatus | Veröffentlicht - 24 Jan. 2018 |
Abstract
In situ temperature-dependent laser-induced photoluminescence and dielectric measurements provide new evidence for the local occurrence of the α → β phase transition near 500 K in the preserved crystalline parts of natural radiation-damaged titanite (sample E2335 with ∼24% amorphous fraction, containing Fe and Al impurities). Photoluminescence spectroscopic measurements show an anomaly in the vicinity of 500 K. The temperature-dependent evolution of the real part of the electrical conductivity (σ) and the real (ϵ′) and the imaginary (ϵ″) part of the complex dielectric permittivity (ϵ∗) of titanite have been measured at various AC frequencies (∼1.2-96.8 kHz). Despite the masking and smearing effect of impurities and defects, the temperature-dependent behaviour of ϵ′ and ϵ″ around the transition temperature of the investigated natural titanite E2335 shows a remarkable similarity to that of the synthetic end-member material (see Zhang et al (1995 Phys. Chem. Miner. 22 41-9)). This study indicates the suitability of photoluminescence and impedance spectroscopy for the detection of phase transitions, even in heavily disordered systems.
ASJC Scopus Sachgebiete
- Physik und Astronomie (insg.)
- Physik der kondensierten Materie
- Werkstoffwissenschaften (insg.)
- Allgemeine Materialwissenschaften
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in: Journal of Physics Condensed Matter, Jahrgang 30, Nr. 3, 035403, 24.01.2018.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Locally preserved α → β phase transition in natural radiation-damaged titanite (CaTiSiO5)
T2 - Evidence from laser-induced photoluminescence and dielectric measurements
AU - Beirau, Tobias
AU - Murawski, Dawid
AU - Behrens, Harald
AU - Salje, Ekhard K.H.
AU - Groat, Lee A.
AU - Kaden, Ronny
AU - Pöllmann, Herbert
AU - Bismayer, Ulrich
N1 - Funding information: Financial support by the Deutsche Forschungsgemeinschaft DFG (BE 5456/2-1) is gratefully acknowledged (TB). EKHS thanks the Leverhulme trust and EPSRC for support (EM-2016-004, EP/K009702/1, EP/P024904/1). LAG acknowledges the financial support of the Natural Sciences and Engineering Research Council of Canada in the form of a Discovery Grant. We thank Boriana Mihailova and Bernhard Klappauf for fruitful discussions and support during the measurements. The constructive comments and helpful suggestions of two anonymous reviewers are gratefully acknowledged.
PY - 2018/1/24
Y1 - 2018/1/24
N2 - In situ temperature-dependent laser-induced photoluminescence and dielectric measurements provide new evidence for the local occurrence of the α → β phase transition near 500 K in the preserved crystalline parts of natural radiation-damaged titanite (sample E2335 with ∼24% amorphous fraction, containing Fe and Al impurities). Photoluminescence spectroscopic measurements show an anomaly in the vicinity of 500 K. The temperature-dependent evolution of the real part of the electrical conductivity (σ) and the real (ϵ′) and the imaginary (ϵ″) part of the complex dielectric permittivity (ϵ∗) of titanite have been measured at various AC frequencies (∼1.2-96.8 kHz). Despite the masking and smearing effect of impurities and defects, the temperature-dependent behaviour of ϵ′ and ϵ″ around the transition temperature of the investigated natural titanite E2335 shows a remarkable similarity to that of the synthetic end-member material (see Zhang et al (1995 Phys. Chem. Miner. 22 41-9)). This study indicates the suitability of photoluminescence and impedance spectroscopy for the detection of phase transitions, even in heavily disordered systems.
AB - In situ temperature-dependent laser-induced photoluminescence and dielectric measurements provide new evidence for the local occurrence of the α → β phase transition near 500 K in the preserved crystalline parts of natural radiation-damaged titanite (sample E2335 with ∼24% amorphous fraction, containing Fe and Al impurities). Photoluminescence spectroscopic measurements show an anomaly in the vicinity of 500 K. The temperature-dependent evolution of the real part of the electrical conductivity (σ) and the real (ϵ′) and the imaginary (ϵ″) part of the complex dielectric permittivity (ϵ∗) of titanite have been measured at various AC frequencies (∼1.2-96.8 kHz). Despite the masking and smearing effect of impurities and defects, the temperature-dependent behaviour of ϵ′ and ϵ″ around the transition temperature of the investigated natural titanite E2335 shows a remarkable similarity to that of the synthetic end-member material (see Zhang et al (1995 Phys. Chem. Miner. 22 41-9)). This study indicates the suitability of photoluminescence and impedance spectroscopy for the detection of phase transitions, even in heavily disordered systems.
KW - CaTiSiO
KW - impedance
KW - phase transition
KW - photoluminescence
KW - radiation damage
KW - titanite
KW - CaTiSiO5
UR - http://www.scopus.com/inward/record.url?scp=85040321282&partnerID=8YFLogxK
U2 - 10.1088/1361-648X/aa9fd8
DO - 10.1088/1361-648X/aa9fd8
M3 - Article
C2 - 29215347
AN - SCOPUS:85040321282
VL - 30
JO - Journal of Physics Condensed Matter
JF - Journal of Physics Condensed Matter
SN - 0953-8984
IS - 3
M1 - 035403
ER -