Synthesis and structures of the partially ordered rock salt phases, Li3M2XO6: MMg, Co, Ni; XNb, Ta, Sb

Mather, Glenn C.; Smith, Ronald I.; Skakle, Janet M. S.; Fletcher, James G.; R, María A. Castellanos; Gutierrez, M. Pilar; West, Anthony R.

doi:10.1039/jm9950501177

Cited by 51 publications

(38 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Li 3 Mg 2 NbO 6 ( x =1/3) has a partially ordered rock salt structure in which Nb cations occupy 8a and Li/Mg cations occupy 8b and 16g, respectively. It has the rock salt superstructure with isolated NbO 6 octahedra sharing edges with 12 adjacent (Li/M) O6 octahedra 19 . Because no T 2 modes have appeared in the case of Li 3 Mg 2 NbO 6 according to the group analysis (Table II), therefore the T 2 bands related to the Nb movements (147 and 187 cm −1 ) in the spectrum of Li 3 NbO 4 disappeared in that of Li 3 Mg 2 NbO 6 .…”

Section: Resultsmentioning

confidence: 99%

Structural Evolution and Microwave Dielectric Properties of Li(3−3x)M4xNb(1−x)O4 (M=Mg,Zn; 0≤x≤0.9)

Bian

Liang

Wang

2010

Journal of the American Ceramic Society

View full text Add to dashboard Cite

Structural evolution of Li(3−3x)M4xNb(1−x)O4 (M=Mg,Zn; 0≤x≤0.9) and microwave dielectric properties of Li(3−3x)Mg4xNb(1−x)O4 have been studied by X‐ray diffraction, scanning electron microscopy, Raman spectra, infrared reflectivity (IR) fitting, and microwave resonant measurement in this work. The crystal symmetry changed from the ordered cubic Li3NbO4 (I‐43m, x=0) into disordered cubic phase (Fm3m) when 0.01≤x<1/3 for the Mg‐doped samples. An intermediate compound of Li3Mg2NbO6 (SG:Fddd) with orthorhombic structure formed at x=1/3 composition. MgO secondary phase appeared in addition to Li3Mg2NbO6 phase in the x>1/3 compositions, and its content increased with the further increase of x. Short‐range cation ordering was confirmed to be present in the cubic phase by Raman analysis. Mixture of Li3NbO4 and ZnO phases was observed in the whole composition range for the ZnO‐added samples. For the Mg‐doped samples, the dielectric constant increased slightly with x increasing up to x=1/3 and decreased with the further increase of x. The Q×f value increased greatly with the increasing x and saturated within the composition range of 0.1≤x<1/3. Further increasing x resulted in a decrease in Q×f value. All samples exhibited negative τf value. Minimum τf value of −22 ppm/°C was obtained at x=1/3. The IR reflection spectra of the x=0, 0.2, and 1/3 samples were analyzed by Kramers–Kroning analysis and classical oscillator model simulation. The dielectric properties were extrapolated down to the microwave range using the classical oscillator model for fitting the dielectric function. The calculated dielectric constants were in agreement with the experimental ones, whereas, the calculated Q×f values showed a reverse varying trend compared with the experimental data.

show abstract

Section: Resultsmentioning

confidence: 99%

Structural Evolution and Microwave Dielectric Properties of Li(3−3x)M4xNb(1−x)O4 (M=Mg,Zn; 0≤x≤0.9)

Bian

Liang

Wang

2010

Journal of the American Ceramic Society

View full text Add to dashboard Cite

show abstract

“…26 In Figure 1, the experimental and calculated XRD profiles as well as their difference are presented for the Rietveld refinement of LMN host. 26 In Figure 1, the experimental and calculated XRD profiles as well as their difference are presented for the Rietveld refinement of LMN host.…”

Section: Resultsmentioning

confidence: 99%

“…[25][26][27] In 2016, Cao et al 28 reported the luminescence properties of Mn 4+ ions doped in this host. [25][26][27] In 2016, Cao et al 28 reported the luminescence properties of Mn 4+ ions doped in this host.…”

Section: Introductionmentioning

confidence: 99%

Insight into a novel rare‐earth‐free red‐emitting phosphor Li₃Mg₂NbO₆:Mn⁴⁺: Structure and luminescence properties

et al. 2019

View full text Add to dashboard Cite

Red phosphor is indispensable to achieve warm white light in the white light diode (WLED) application. However, the current red phosphors suffer from high cost and harsh synthesis conditions. In this study, an oxide-based rare-earth-free red-emitting phosphor Li 3 Mg 2 NbO 6 :Mn 4+ (LMN:Mn 4+ ) has been successfully synthesized by a simple solid-state reaction method. The relationship between crystal structure and luminescence was investigated in detail. The site occupancy of the doping Mn 4+ ion in the LMN host has been discussed from the point of bond valence sum. How the coordination environment of doping Mn 4+ affects the energy level of doping Mn 4+ ion has been illustrated via the Tanabe-Sugano energy-level diagram. Moreover, warm white light has been obtained using LMN:Mn 4+ as compensator to the YAG:Ce 3+ . K E Y W O R D Scalculation, luminescence materials, Mn 4+ , phosphor, photoluminescence

show abstract

“…In the latter case the cations can be disordered to give the simple face centred cubic structure or can exhibit a range of cation ordering arrangements. Recently, a family of structures, Li M XO : M"Mg, Co, Ni; X"Nb, Ta, Sb, has been shown to exhibit partial cation order but with an unusual nonstatistical occupancy of the Li/M sites [1,2]: there are three sets of sites for the Li/M cations and the distribution over these sites is nonrandom and varies with the nature of M (and X). The partial cation order appears to be an equilibrium arrangement at low temperatures, although in the case of Li Ni NbO , the cation arrangement becomes increasingly statistical over the range 1100-1300°C, as the structure undergoes a continuous (partial) order-disorder transition [3].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Li3Cu2SbO6, a New Partially Ordered Rock Salt Structure

Skakle

Tovar

et al. 1997

Journal of Solid State Chemistry

View full text Add to dashboard Cite

Synthesis and structures of the partially ordered rock salt phases, Li₃M₂XO₆: MMg, Co, Ni; XNb, Ta, Sb

Cited by 51 publications

References 7 publications

Structural Evolution and Microwave Dielectric Properties of Li(3−3x)M4xNb(1−x)O4 (M=Mg,Zn; 0≤x≤0.9)

Structural Evolution and Microwave Dielectric Properties of Li(3−3x)M4xNb(1−x)O4 (M=Mg,Zn; 0≤x≤0.9)

Insight into a novel rare‐earth‐free red‐emitting phosphor Li₃Mg₂NbO₆:Mn⁴⁺: Structure and luminescence properties

Synthesis of Li3Cu2SbO6, a New Partially Ordered Rock Salt Structure

Contact Info

Product

Resources

About

Synthesis and structures of the partially ordered rock salt phases, Li3M2XO6: MMg, Co, Ni; XNb, Ta, Sb

Cited by 51 publications

References 7 publications

Structural Evolution and Microwave Dielectric Properties of Li(3−3x)M4xNb(1−x)O4 (M=Mg,Zn; 0≤x≤0.9)

Structural Evolution and Microwave Dielectric Properties of Li(3−3x)M4xNb(1−x)O4 (M=Mg,Zn; 0≤x≤0.9)

Insight into a novel rare‐earth‐free red‐emitting phosphor Li3Mg2NbO6:Mn4+: Structure and luminescence properties

Synthesis of Li3Cu2SbO6, a New Partially Ordered Rock Salt Structure

Contact Info

Product

Resources

About

Synthesis and structures of the partially ordered rock salt phases, Li₃M₂XO₆: MMg, Co, Ni; XNb, Ta, Sb

Insight into a novel rare‐earth‐free red‐emitting phosphor Li₃Mg₂NbO₆:Mn⁴⁺: Structure and luminescence properties