The family (SrO)(SrNbO2-xN)n is the first example of Ruddlesden-Popper strontium niobium oxynitrides and provides layered structures to obtain mixed valence niobium compounds with a variety of oxidation states and transport properties. We have prepared members with n=1 (Sr2NbO3N) and n=2 (Sr3Nb2...

In this work, we report the silver doping as a novel strategy for developing single-phase mixed conducting ceramic membranes with perovskite-type structure for the efficient oxygen separation from air. Specifically, perovskite-type oxide with a nominal composition of Sr0.95Ag0.05Co0.9Nb0.1O3-δ ...

Bulk glasses of the compositional series (A) xNb2O5–(50-x)ZnO–50P2O5 and (B) xNb2O5–50ZnO-(50-x)P2O5 were prepared to investigate possible substitution of cation (Zn2+), series A, and anion (PO3−), series B, with niobium and the effect of this substitution on the structure, density, molar vol...

The effects of the polymer precursor in polymerizable complex (PC) method for the preparation of a Sr–Nb mixed oxide photocatalyst were studied. A polymer made of citric acid and ethylene glycol, which is generally applied in the PC method, as well as that made of succinic acid and 2-(2-aminoet...

Lead zirconate titanate (PZT) based ceramics are currently enjoying a wide use in piezoelectric devices despite lead toxicity. Due to growing environmental concerns, the attention on piezoelectric ceramics has been moving to lead-free materials, in particular to (K,Na)NbO3-based ceramics. Here w...

Lead magnesium niobate-lead titanate (PMN-PT) single crystals were prepared using a modified Bridgman method and then cut into thin sheets in an [0 0 1] orientation. The sheets have chemical composition of Pb0.995(Mg0.217Nb0.505Ti0.262)O3 and exhibit excellent ferroelectric and piezoelectric pro...

Lead-free piezoelectric ceramics are urgently needed in the field of electromechanical conversion devices due to the restriction on the use of lead-based ceramics. In this study, the polymorphic phase boundary (PPB) were tuned by incorporating different concentration of (Bi0.5K0.5)HfO3 into the ...

Dy-doped lead potassium niobate (Pb2KNb5O15, PKN) single crystal was grown by the modified vertical Bridgman method through spontaneous nucleation. The crystal was brownish, transparent and inclusion free. Five excitation peaks of Dy3+ ions were clearly seen from near ultraviolet region to blue ...

Lead-free glass and glass-ceramics in Na2O-BaO-Nb2O5-SiO2 (mol%) system were successfully synthesized. The tailoring effect of crystallization temperature on the structural, dielectric, and energy storage properties of the material system was investigated. Two types of nano-sized crystalline pha...

In this work, we present a new piezoelectric solid solution consisting of two typical alkali niobate-based materials, K0.5Na0.5NbO3 (KNN) and Li0.15Na0.85NbO3 (LNN). Although KNN and LNN have the same perovskite structure, they exhibit extremely different electrical properties and mechanical beh...

Lead Indium Niobate, Pb(In0.50Nb0.50)O3 (PIN) is a complex perovskite that exhibits Relaxor (R) characteristics. In this study, we report the synthesis of phase-pure compositions in the system Pb[(In0.50−xFex)Nb0.50]O3 by sol–gel method and discuss the influence of isovalent substitution of Ind...

Rhombohedral samarium doped Lead based ceramic materials were fabricated by a high temperature conventional solid state mixed oxide ceramic process. The ceramic composition Pb1-x-3y/2Bax Rey3+ Nb2O6 (x = 0.35 and y = 0.00, 0.02, 0.04 and 0.06, Re3+ = Sm3+). The pure and Sm3+ doped lead barium ni...

Understanding the phase structure evolution is important for developing high performance lead-free piezoelectric materials. In this work, the effects of A-site ionic size of monovalent ions on the phase transition behaviors for the lead-free niobate ceramics ANbO3 (A = Li, Na, Ag, and K) are inv...

During the course of investigating novel low dimensional ternary chalcogenide compounds, we have synthesized Nb3GeTe6, a new member of the layered telluride phases that belongs to the NbxMTe2x family. The crystal structure of Nb3GeTe6 has been determined by single-crystal X-ray analysis. It crys...

Nb3SiTe6, a new type of layered ternary telluride compound, has been synthesized. The structure is determined by single-crystal X-ray diffraction methods. The compound crystallizes in space group Pnma (No. 62) with Z=4, a=6.353(2) Å, b=13.938(5) Å, c=11.507(4) Å, V=1018.9(6) Å3, R=4.77% and ...

NbFe1.28Te3, a new ternary niobium telluride compound, was synthesized via solid state reactions. The crystal structure of this compound was determined by single crystal X-ray diffraction methods. The structure belongs to the monoclinic space group P21/m (number 11) and is isostructural with TaF...

Niobium telluride thin films were evaluated as intercalation electrodes in lithium cells. The films were prepared on Al substrate by sputter deposition under different experimental conditions. Large deposition periods lead to a non-crystalline film material, while short deposition periods allow ...

We present XAFS (K-edge) studies of the local atomic structure around the Nb and Te ions in niobium tellurides (NbTe2, Nb3Te4 and NbTe4) in comparison with ZrTe2. Using a multi-shell best-fit analysis procedure, we have reconstructed local environments of the Nb and Te ions and compared them wit...

In addition to the softening of the lattice, a lattice stiffening has been observed at temperatures below the transformation. This is in accordance with theory, which predicts that the influence of the d-electrons on the elastic behaviour vanishes at T = 0.

Mechanochemical synthesis (MCS) investigations of niobium silicide powders in Nb2O5SiO2Mg powder mixtures were conducted via high-energy ball milling and leaching by means of process parameters such as the milling duration, initial Nb2O5 crystal structure, and excess Mg amount. The compositional...