Thermal and dielectric properties of ferroelectric lead germanate single crystals doped with chromium ions (Pb5Ge3O11:Cr3+)
Single crystals of Pb 5 Ge 3 O 11 (PGO), pure and doped with Cr 3+ ions, were grown by means of Czochralski and Kyropoulos method, respectively. Structural, microstructural, thermodynamic and dielectric properties were investigated in terms of Cr 3+ -doping. The temperature dependences of molar heat...
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| Published in: | Phase transitions Vol. 91; no. 9-10; pp. 923 - 931 |
|---|---|
| Main Authors: | , , , , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
Abingdon
Taylor & Francis
03-10-2018
Taylor & Francis Ltd |
| Subjects: | |
| Online Access: | Get full text |
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| Summary: | Single crystals of Pb
5
Ge
3
O
11
(PGO), pure and doped with Cr
3+
ions, were grown by means of Czochralski and Kyropoulos method, respectively. Structural, microstructural, thermodynamic and dielectric properties were investigated in terms of Cr
3+
-doping. The temperature dependences of molar heat capacity in the range 120-700 K at constant pressure (c
p
) for PGO and PGO:Cr
3+
(0.2%) crystals were shown. Wide λ-shape anomalies correspond to the second-order phase transitions from ferroelectric to the paraelectric phase taking place at 453 K and 431 K for PGO and PGO:Cr
3+
(0.2%), respectively. The temperature dependences of c
p
for investigated crystals were approximated by the Einstein function and near the Curie temperature the c
p
reaches the classical Dulong-Petit limited value ∼475 J·mol
−1
·K
−1
. Temperature dependences of dielectric permittivity measured along and perpendicular to the ferroelectric axis in the temperature range 300-550 K are investigated. These studies revealed anisotropic behavior of PGO and PGO:Cr
3+
(0.2%) crystals. |
|---|---|
| ISSN: | 0141-1594 1029-0338 |
| DOI: | 10.1080/01411594.2018.1507032 |