Journal ArticleDOI
Ferroelectric and optical properties of Pb5Ge3O11 and its isomorphous compound Pb5Ge2SiO11
TLDR
In this paper, the temperature characteristics of dielectric constants, spontaneous polarization, thermal expansion coefficients, indices of refraction, and optical rotatory power of Pb5Ge3O11 single crystals have been investigated in detail from room temperature up to above the Curie temperature, 177°C.Abstract:
The temperature characteristics of dielectric constants, spontaneous polarization, thermal‐expansion coefficients, indices of refraction, and optical rotatory power of Pb5Ge3O11 single crystals have been investigated in detail from room temperature up to above the Curie temperature, 177°C. From the results of these measurements, the following constants were obtained: linear thermal‐expansion coefficients (αa)F=7.75×10−6/deg°C and (αc)F=7.79×10−6/deg°C (ferroelectric phase), (αa)P=13.8×10−6/deg°C and (αc)P=13.4×10−6/deg°C (paraelectric phase); quadratic electro‐optic constants g33T=0.47×108 cm4 /C2, g13T=0.37×108 cm4 /C2; and electrogyration coefficient γ33 =8.7 cm2/C. An isomorphous compound Pb5(Ge2O7)(SiO4) was synthesized and was found to be ferroelectric with T c=60°C and Ps=1.7 μC/cm2 at room temperature. Ferroelectric properties and electrogyration coefficient were studied in the solid‐solution system Pb5(Ge2O7)(GeO4)1−x (SiO4)x.read more
Citations
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Journal ArticleDOI
New high T c multiferroics KBiFe 2 O 5 with narrow band gap and promising photovoltaic effect
Ganghua Zhang,Hui Wu,Hui Wu,Guobao Li,Qingzhen Huang,Chongyin Yang,Fuqiang Huang,Fuqiang Huang,Fuhui Liao,Jianhua Lin +9 more
TL;DR: A new FE compound with MO4 tetrahedral network, KBiFe2O5, which features narrow Eg, high Curie temperature, and robust magnetic and photoelectric activities and may open a new avenue to discovering and designing optimal FE compounds for solar energy applications.
Journal ArticleDOI
Structural phase transitions III. Critical dynamics and quasi-elastic scattering
Alastair D. Bruce,R. A. Cowley +1 more
TL;DR: The results of scattering experiments revealing this phenomenon are surveyed in detail, and are used in an assessment of current theories, subdivided into three categories: those which seek to describe the phenomenon within an extended phonon-based theory; those which attempt to trace the effect to the formation of long-lived clusters of precursor order; and those which associate the quasi-elastic scattering with crystal imperfections as mentioned in this paper.
Journal ArticleDOI
Experimental and phenomenological aspects of circular birefringence and related properties in transparent crystals
TL;DR: In this article, the authors review the history, theory, measurement technique and experimental results on gyrotropic phenomena including optical rotation (optical activity), electrogyration, the Faraday effect and magneto-electrogyration in transparent crystals, including examples of structural phase transitions.
Journal ArticleDOI
Pyroelectric effects in thin film
J. D. Zook,S. T. Liu +1 more
TL;DR: In this article, the pyroelectric effect in a thin film rigidly attached to a thick substrate is discussed and compared to the usual (stress-free) effect, and the effects of clamping are negligible.
Journal ArticleDOI
Synthesis, Structure, and Properties of 4,8,12-Trioxa-12c-phospha-4,8,12,12c-tetrahydrodibenzo[cd,mn]pyrene, a Molecular Pyroelectric
Frederik C. Krebs,Peter S. Larsen,Jan Larsen,Claus Schelde Jacobsen,Carlo Boutton,Niels Thorup +5 more
TL;DR: The title compound (4) was synthesized and its crystalline structure was determined in this article, and the molecule has C3v point symmetry and crystallizes in the trigonal space group R3m.
References
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Journal ArticleDOI
5PbO·3GeO2 CRYSTAL; A NEW FERROELECTRIC
TL;DR: In this paper, the dielectric constants and refractive indices of a 5PbO · 3GeO2 crystal, which was grown from the melt by by the Czochralski method, were measured as a function of temperature.
Journal ArticleDOI
Structural basis of ferroelectricity and ferroelastcity
S. C. Abrahams,E. T. Keve +1 more
TL;DR: In this article, the properties of ferroelectric and ferroelastic crystals are examined in terms of atomic arrangement, and the mechanism of simultaneous polarization reversal and orientational change of state in ferroelectroelectric-ferro-elastic crystal is analyzed.
Journal ArticleDOI
Optical Activity of Ferroelectric 5PbO·3GeO2 Single Crystals
Hiroshi Iwasaki,Kiyomasa Sugii +1 more
TL;DR: In this paper, the Czochralski-grown ferroelectric crystal 5PbO·3GeO2 Reversal of the spontaneous polarization Ps caused the enantiomorphic transformation of the crystal and consequently the change in the sign of the optical rotatory power.
Journal ArticleDOI
Elastic and Piezoelectric Properties of Ferroelectric 5PbO · 3GeO2 Crystals
TL;DR: In this article, the elastic, piezoelectric, and dielectric constants of a new ferroelectric crystal 5PbO · 3GeO2 have been measured.
Journal ArticleDOI
Crystal growth and some properties of 5PbO · 3GeO2 single crystals
TL;DR: In this paper, a single crystal of 5PbO · 3GeO2 was grown from the melt by the Czochralski method and the crystal has a hexagonal cell a = 10.25 1 and c =10.68 5 A, and the refractive indices no = 2.1306 and ne =2.1644 at λ = 5791A.