TITLE

1:2 Cation order in A(Li[sub 1/3](Nb,Ta)[sub 2/3])O[sub 3] microwave perovskites

AUTHOR(S)
Borisevich, Albina; Davies, Peter K.
PUB. DATE
February 2004
SOURCE
Applied Physics Letters;2/23/2004, Vol. 84 Issue 8, p1347
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
In a family of perovskites with the general stoichiometry (A[sub 2/3][sup 2+]La[sub 1/3])(B[sub 1/3][sup 1+]B[sub 2/3][sup 5+])O[sub 3], three 1:2 ordered perovskites were prepared with A=Sr, B[sup 1+]=Li, B[sup 5+]=Nb, Ta and with A=Ca, B[sup 1+]=Li, B[sup 5+]=Nb. These compounds can be sintered to high density at temperatures ≤1350 °C, have dielectric constants in the range 25–30, microwave quality factors as high as 26 000, and negative temperature coefficients of resonant frequency. A 1:2 polymorph was not observed for (Ca[sub 2/3]La[sub 1/3])(Li[sub 1/3]Ta[sub 2/3])O[sub 3] which adopted a 1:1 ordered structure. The larger charge difference between the ions involved in the B-site ordering in these systems compared to other 1:2 ordered microwave perovskites such as Ba(Zn[sub 1/3]Nb[sub 2/3])O[sub 3], is reflected by a higher stability of the order which is stable up to their decomposition/melting temperature. © 2004 American Institute of Physics.
ACCESSION #
12292653

 

Related Articles

  • Strain of interatomic bonds and crystallochemical aspects of AB B O3 oxides with perovskite structure. Olekhnovich, N. M. // Crystallography Reports;Mar2006, Vol. 51 Issue 2, p169 

    A method for determining the strain characteristics of interatomic bonds in crystals of ternary oxides AB B O3 with perovskite structure, i.e., AB B O3 ( B″ = Nb, Ta, Sb, Re, or Bi) and AB B O3 ( B″ = Mo, W, Re, Os, or U), is developed. A linear relationship is established between...

  • Increasing Hydrogen Density with the Cation-Anion Pair BH4--NH4+ in Perovskite-Type NH4Ca(BH4)3. Schouwink, Pascal; Morelle, Fabrice; Sadikin, Yolanda; Filinchuk, Yaroslav; Černý, Radovan // Energies (19961073);Aug2015, Vol. 8 Issue 8, p8286 

    A novel metal borohydride ammonia-borane complex Ca(BH4)2.NH3BH3 is characterized as the decomposition product of the recently reported perovskite-type metal borohydride NH4Ca(BH4)3, suggesting that ammonium-based metal borohydrides release hydrogen gas via ammonia-borane-complexes. For the...

  • Low-Loss Microwave Dielectrics for Different Frequency Ranges. Belous, A.; Ovchar, O. // Acta Physica Polonica, A.;Jan2010, Vol. 117 Issue 1, p221 

    Depending on the operating frequency range of modern communication systems various microwave elements are required for effective operation of radio equipment. In this work potential ways of developing the microwave dielectric materials for different frequency ranges are discussed. It has been...

  • Enhanced piezoelectric properties of (Bi0.5K0.5+xLiy)TiO3 ceramics by K nonstoichiometry and Li addition. Sung, Y. S.; Lee, H. M.; Du, W.; Yeo, H. G.; Lee, S. C.; Cho, J. H.; Song, T. K.; Kim, M. H. // Applied Physics Letters;2/9/2009, Vol. 94 Issue 6, pN.PAG 

    Effects of K nonstoichiometry and Li addition on piezoelectric and dielectric properties of (Bi0.5K0.5+xLiy)TiO3 ceramics were studied in the range of x=-8–1 and y=0–5 mol % from the stoichiometric K0.5. A tetragonal perovskite structure was maintained at all compositions despite...

  • Study of the formation temperature of mixed LaREO (RE ≡ Dy, Ho, Er, Tm, Yb, Lu) and NdGdO oxides. Artini, C.; Costa, G.; Masini, R. // Journal of Thermal Analysis & Calorimetry;Jan2011, Vol. 103 Issue 1, p17 

    Mixed LaREO (RE ≡ Dy, Ho, Er, Tm, Yb, Lu) and NdGdO oxides were prepared by thermal decomposition of the corresponding co-precipitated mixed oxalates. The decomposition of La/RE and Nd/Gd oxalates was studied by means of differential thermal analysis and thermogravimetric (DTA-TG)...

  • Cation ordering and dielectric properties of PMN-PSN relaxors. Davies, P. K.; Farber, L.; Valant, M.; Akbas, M. A. // AIP Conference Proceedings;2000, Vol. 535 Issue 1, p38 

    Extended thermal annealing treatments were used to modify the B-site cation order in the (1-x)PMN - (x)PSN perovskite system. Extensive 1:1 ordering could be induced in compositions with x ≥ 0.1. The substitution of PSN into PMN produces a large increase in the thermal stability of the 1:1...

  • Low-temperature structural and dielectric phenomena in La1/3NbO3 and La1/3TaO3: Comparative study. Salak, Andrei N.; Vyshatko, Nikolai P.; Khalyavin, Dmitry D.; Prokhnenko, Oleksandr; Ferreira, Victor M. // Applied Physics Letters;10/20/2008, Vol. 93 Issue 16, p162903 

    The crystal structures of the perovskites La1/3NbO3 and La1/3TaO3 were studied between 10 and 350 K using high-resolution neutron powder diffraction and compared with their radio-frequency dielectric response over the same temperature range. The structure of La1/3NbO3 remains orthorhombic Cmmm,...

  • Synthesis and Structural Characterization of the LaAMnO (A=Sr,Ca,Ba and Na) Nanocrystalline Powders Prepared by a Simple Thermal Decomposition Route. Daengsakul, Sujittra; Thomas, Chunpen; Mongkolkachit, Charusporn; Maensiri, Santi // Journal of Superconductivity & Novel Magnetism;Oct2012, Vol. 25 Issue 7, p2507 

    Nanocrystalline powders of a manganite compound in the series of LaAMnO (LA3M), where A is Ca, Na, Sr or Ba are synthesized by a simple thermal decomposition method using related acetate salts as starting materials in aqueous solution. The precursors are analyzed by...

  • Investigation of the Less Oxygen Deficient SrFeO3-δ. Manimuthu, P.; Joseph, D. Paul; Raja, S. Philip; Kovendhan, M.; Venkateswaran, C. // AIP Conference Proceedings;7/16/2011, Vol. 1349 Issue 1, p1181 

    Perovskite type SrFeO3 is a suitable candidate for gas sensors and catalytic applications. It is very difficult to stabilize the stoichiometric SrFeO3, which is highly unstable because of the presence of Fe4+ ions that leads to the oxygen vacancies (δ) in order to maintain charge equilibrium....

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics