Correlations between interatomic bond strain and Curie temperature for complex oxides based on quasielastic model of perovskite structure

2020 ◽  
Vol 559 (1) ◽  
pp. 77-82 ◽  
Author(s):  
G. A. Geguzina
Keyword(s):  
Curie Temperature ◽  
Perovskite Structure ◽  
Complex Oxides ◽  
Interatomic Bond ◽  
Bond Strain

Effects of Fe2O3 addition on microstructure and piezoelectric properties of 0.2PZN–0.8PZT ceramics

2005 ◽  
Vol 20 (10) ◽  
pp. 2670-2675 ◽  
Author(s):  
Man-Kang Zhu ◽  
Peng-Xian Lu ◽  
Yu-Dong Hou ◽  
Hao Wang ◽  
Hui Yan
Keyword(s):  
Grain Size ◽  
Curie Temperature ◽  
Phase Analysis ◽  
Perovskite Structure ◽  
Piezoelectric Properties ◽  
Sharp Decrease ◽  
Phase Evolution ◽  
Small Addition ◽  
Microstructure Change ◽  
Dielectric And Piezoelectric Properties

In this work, the effect of Fe2O3 addition on the microstructure and piezoelectric properties of Pb(Zn1/3Nb2/3)0.2Ti0.4Zr0.4O3 (0.2PZN–0.8PZT) ceramics were investigated. The studies indicated that the solution limit of Fe2O3 in the lattice of perovskite structure was about 0.1 wt%. Phase analysis shows that small addition of doping Fe2O3 results in the phase evolution from rhombohedral to tetragonal, sharp decrease of the Curie temperature, and remarkable increase of the grain size. Meanwhile, Fe2O3 addition within the solution limit led to the increase of the εr, kp, and d33. It is believed that the variation in the dielectric and piezoelectric properties are closely related to the microstructure change, phase evolution, and tetragonal distortion as Fe2O3 added.

scholarly journals The complex oxides with octahedral structures: Existence areas and phase transitions

2020 ◽  
Vol 10 (01n02) ◽  
pp. 2060013 ◽  
Author(s):  
G. A. Geguzina
Keyword(s):  
Phase Transitions ◽  
Solid State ◽  
Calculated Data ◽  
Complex Oxides ◽  
Interatomic Bond ◽  
The Other ◽  
Layered Perovskite ◽  
Geometric Models ◽  
Antiferroelectric Phase ◽  
The One

The experimental and calculated data on the existence of complex oxides in solid state with the octahedral structures of four families, namely perovskites, Bi-containing layered perovskite-like ones, tetragonal tungsten bronzes and pyrochlores, and about their phase transitions are systematized and summarized on the basis of the quasi-elastic or geometric models of these structures. It has been established that similar existence areas and similar correlations between the interatomic bond strains in their structures, on the one hand, and the temperatures of their ferroelectric or antiferroelectric phase transitions, on the other hand, are observed for all of them, despite the differences in the compositions and structures of these oxides, but taking into account their similar parameters.

Piezoelectric Properties and Dielectric Property of Li Added KNN Ceramics

2013 ◽  
Vol 566 ◽  
pp. 72-75 ◽  
Author(s):  
Akihiro Mitani ◽  
Yoshinari Oba
Keyword(s):  
Dielectric Property ◽  
Curie Temperature ◽  
Perovskite Structure ◽  
High Performance ◽  
Piezoelectric Properties ◽  
Piezoelectric Materials ◽  
Environmental Issues ◽  
Lead Free ◽  
High Curie Temperature ◽  
A Site

Recently, high performance lead-free piezoelectric materials are strongly demanded for environmental issues. (K0.5Na0.5)NbO3 (KNN) has been attracting interest as lead-free piezoelectric ceramics because of its high Curie temperature and excellent piezoelectric properties. In this study, we investigated effects of Li addition on piezoelectric properties of (Li,Na,K)(Nb+Ta)O3+CuO,BaTiO3 . We found that optimum Li ratio of A site and B site on the perovskite structure increases relative density and .

Conditions for stabilization of the ordered state of cations in complex oxides with perovskite structure

2005 ◽  
Vol 50 (4) ◽  
pp. 531-536
Author(s):  
A. Yu. Gufan ◽  
Yu. V. Prus ◽  
V. V. Rumyantseva
Keyword(s):  
Perovskite Structure ◽  
Complex Oxides ◽  
Ordered State

Pulsed Laser Deposition of (Sr1-xCa)RuO3 and Sr(Ru1-xTix)O3 Thin Films by Sequential Multilayer Process

1997 ◽  
Vol 474 ◽  
Author(s):  
L. Mffiville ◽  
L. Antognazza ◽  
K. Char ◽  
T. H. Geballe
Keyword(s):  
Thin Films ◽  
Curie Temperature ◽  
Pulsed Laser Deposition ◽  
Perovskite Structure ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
Ti Substitution ◽  
High Level ◽  
End Members ◽  
Ti Doping

ABSTRACTWe report on the growth and properties of (Sr1-xCax)Ru03 and Sr(Ru1-xTix)O3 thin films obtained by pulsed laser deposition. A sequential deposition of sub-monolayers from SrTiO3 and CaRuO3 end members has been successfully used to substitute Ca- and Ti- in the SrRuO3 perovskite structure. Magnetization measurements as well as transport properties exhibit very different behavior for each type of substitution. In the case of Ca- substituted samples, the resistivity remains metallic and is consistent with the expected behavior for intermediate compositions. A progressive reduction of the Curie temperature with higher doping is reported. In the case of Ti- substituted samples, we observe a stronger reduction of the Curie temperature and remanent magnetization with increasing Ti substitution. Resistivity as a function of temperature shows a crossover from metallic to semiconducting behavior with variable range hopping process for a high level of Ti doping and points out the clear differences between the two substitutions sites. In both cases, the observed reduction of the magnetization with increasing doping concentration can be well described by assuming a random distribution of substituted sites in the perovskite structure.

High Curie Temperature Bismuth-Based Piezo-/Ferroelectric Single Crystals of Complex Perovskite Structure: Recent Progress and Perspectives

CrystEngComm ◽  
2021 ◽  
Author(s):  
Zenghui Liu ◽  
Hua Wu ◽  
Jian Zhuang ◽  
Gang Niu ◽  
Nan Zhang ◽  
...  
Keyword(s):  
Curie Temperature ◽  
Single Crystals ◽  
Perovskite Structure ◽  
Recent Progress ◽  
Ferroelectric Materials ◽  
High Curie Temperature ◽  
Complex Perovskite ◽  
Sensors And Actuators ◽  
Energy Harvesters ◽  
Wide Range

Piezo-/ferroelectrics are essential materials for electromechanical sensors and actuators and energy harvesters in a wide range of technological applications. The demand for piezo-/ferroelectric materials with high Curie temperature (TC) arises...

Mobility and Reactivity of the Surface and Lattice Oxygen of Some Complex Oxides with Perovskite Structure

2004 ◽  
pp. 53-74 ◽  
Author(s):  
V. A. Sadykov ◽  
N. N. Bulgakov ◽  
V. S. Muzykantov ◽  
T. G. Kuznetsova ◽  
G. M. Alikina ◽  
...  
Keyword(s):  
Perovskite Structure ◽  
Complex Oxides ◽  
Lattice Oxygen

scholarly journals ELECTROPHYSICAL PROPERTIES OF SOLID SOLUTIONS NANBFEO-(x = 0;0,1;0,2)

2020 ◽  
pp. 16-24
Author(s):  
Екатерина Владимировна Барабанова ◽  
Никита Михайлович Оспельников ◽  
Александра Ивановна Иванова
Keyword(s):  
Phase Transition ◽  
Electrical Conductivity ◽  
Electrical Properties ◽  
Curie Temperature ◽  
General Formula ◽  
Solid Solutions ◽  
Complex Oxides ◽  
Sodium Niobate ◽  
Electrophysical Properties ◽  
The Family

Введение легирующих примесей является классическим способом модификации свойств сложных оксидов семейства перовскита с общей формулой ABO. В качестве основы для создания твердых растворов широко используется ниобат натрия NaNbO. Введение замещающих катионов проводится как по позиции A, так и по позиции B. При этом особый интерес представляет случай, когда валентность легирующей примеси больше или меньше валентности исходного катиона в узле. В этом случае образуется дефектная структура, которая может обладать уникальными свойствами. Данная работа посвящена исследованию электрофизических свойств керамики ниобата натрия с примесью Fe. Замещение производилось по позициям катионов ниобия Nb . Показано, что для таких составов характерно значительное увеличение электропроводности, понижение температуры Кюри и размытие фазового перехода. Introduction of dopants is a classic method for modifying properties of perovskite complex oxides of the family of general formula ABO. Sodium niobate NaNbO is widely used as a basis for creating solid solutions. The introduction of substitutional cations is carried out at both position A and at position B . Of particular interest is the case when valence of the dopant is greater or less than valence of the initial cation at the site. In this case, a defected structure is formed, which may have unique properties. This work is devoted to study of the electrical properties of sodium niobate ceramics doped with Fe . The substitution was carried out according to positions of the nibium cations Nb . It is shown that such compositions are characterized by a significant increase in electrical conductivity, a decrease in the Curie temperature, and a diffuse of the phase transition.

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