Chan, J.
, Feb-Ayala, W.
, Loezos, J.
, Rotter, L.
, Levine, L.
and Geyer, R.
(2021),
Subsolidus Phase Relationships in the AO-AI<sub>2</sub>O<sub>3</sub>-Nb<sub>2</sub>O<sub>5</sub>(A=Ca, Sr) Systems, Sigma Xi Web Page
(Accessed October 8, 2025)
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Subsolidus Phase Relationships in the AO-AI2O3-Nb2O5(A=Ca, Sr) Systems
Published
Author(s)
Julia Y. Chan, Wilma Feb-Ayala, J. M. Loezos, , ,
Abstract
Dielectric ceramics for wireless communications exhibiting modest permittivity, high quality factor (Q), and near-zero temperature coefficient are needed for high-frequency, high power applications. Efforts are in progress to replace Ta2O5-based ceramics with less costly oxides that exhibit similar properties. Phase equilibria relations in the CaO-Al2O3-Nb2O5 and SrO-Al2O3-Nb2O5 systems have been determined at 1350-1525 C in air. Phase assemblages were determined by X-ray powder diffraction methods at room temperature. The existence of the double perovskites, A2AlNbO6 (A=Ca, Sr), were confirmed in both ternary systems. In the SrO-Al2O3-Nb2O5 system, a previously unreported ternary phase was found to occur between Sr2AlNbO6 and SrO. A series of cryolite-type solid solutions, Sr3(Sr1-xNb2-x)O9-3/2x (0Citation
Sigma Xi Web Page
Pub Type
Journals
Keywords
microwave dielectric, oxides, properties phase equilibria, structure
Citation
Issues
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Created October 12, 2021