Thermophysical Properties of NZP Ceramics (A Review)

Петьков, В. И.; Asabina, E. A.

doi:10.1023/b:glac.0000048353.42467.0a

Cited by 43 publications

(12 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The resistance of the NZP structure to lattice parameter variations with compositional variations is attributable to covalent bonding with rigid structural anion [Zr 2 (PO 4 ) 3 ] −1 . Additionally, uniformly distributed interstitial vacant sites act to buffer distortions associated with interstitial substitutions of cations 16 …”

Section: Resultsmentioning

confidence: 99%

Low Temperature Synthesis of Porous NZP Ceramics

Bothe

Brown

2008

Journal of the American Ceramic Society

View full text Add to dashboard Cite

Porous phase‐pure NaZr2(PO4)3 monoliths were synthesized at 850°C from gels that precipitated as a consequence of mixing water‐soluble precursors. The sintering temperature was limited to 850°C to permit densification in a range where NZP exhibits a low coefficient of thermal expansion. Attempts to maximize mechanical properties were made by both physical and chemical means. Particulate hydroxyapatite (HAp) was physically blended with the precipitated gels to template the crystallization of NZP. Copper nitrate was dissolved into solution as a sintering aid to stimulate liquid‐phase sintering during firing. NZP made without these additives attained a specific surface area of 30 m2/g. The addition of HAp reduced the internal surface area to 5 m2/g. X‐ray diffraction and scanning electron microscopy did not detect the presence of HAp in the fired samples, indicating it had been consumed during firing. Copper nitrate decomposed to CuO and its presence as a sintering aid resulted in enhanced densification and greater strengths. The presence of 5% CuO (as copper nitrate) together with 5% HAp resulted in a 40% volume shrinkage during firing. The tensile strength attained for this composition was 20 MPa as compared with that of approximately 8 MPa for the compositions fired without additives.

show abstract

Section: Resultsmentioning

confidence: 99%

Low Temperature Synthesis of Porous NZP Ceramics

Bothe

Brown

2008

Journal of the American Ceramic Society

View full text Add to dashboard Cite

show abstract

“…Previous experimental studies have shown that the thermal expansion of NASICON framework is significantly influenced by the interstitial ion as well as framework compositions [39][40][41][42][43][44][45]-a very useful property in the tailor making of low thermal expansion solids. In Fig.…”

Section: Methodsmentioning

confidence: 99%

Framework flexibility of sodium zirconium phosphate: role of disorder, and polyhedral distortions from Monte Carlo investigation

Roy

Kumar

2012

J Mater Sci

View full text Add to dashboard Cite

A detailed Monte Carlo investigation of the structural changes of the framework of sodium zirconium phosphate, [Zr 2 P 3 O 12 ] -,-NASICON (acronym for NaSuperIonic CONductor)-accommodating alkali ions of varying sizes (Li ? , Na ? , K ? , Rb ? and Cs ? ) is carried out over a range of temperatures. Simulation results are critically compared with the structural models proposed earlier and available experimental results. Anisotropic changes of the rhombohedral cell parameters-a contracts while c expands with the size of the alkali ion substituted-is observed in good agreement with previous experimental results. The mechanism of anisotropic variation of lattice parameters involves dominantly, coupled rotations of the polyhedra as proposed by Alamo and co-workers. It is, however, observed that the distortions of the PO 4 tetrahedra and ZrO 6 octahedra are significant, and accounts for nearly one-third of the total change in a and c-parameters as the size of the alkali ion increases. This suggests that 'rigid' polyhedral models, permitting only angular distortions of the polyhedra, are of limited quantitative applicability in these solids. The same mechanism is found to be responsible for the low/anisotropic thermal expansion of these solids. Evidence that the polyhedral rotations are dynamic, opposed to a static-frozen-in disorder, is provided.

show abstract

“…In recent years, we have successfully synthesized monolithic ceramics of calcium phosphate [18], lithium iron phosphate [19] and zirconium phosphate (ZrP) [20] with co-continuous macropores. As an important category of inorganic phosphate materials closely related to ZrP, MZP materials are widely used as solid-state electrolytes with high ion conductivity at relatively low temperatures [21], ion exchangers for solidification of nuclear waste [22] as well as ceramics with ultralow thermal expansion over a broad temperature range [23,24]. Although solid-state synthesis is generally applied to obtain MZP ceramics, it usually requires high sintering temperature and finds difficulty in inducing high porosity (> 40 %) with controlled pore parameters.…”

Section: Introductionmentioning

confidence: 99%

Metal zirconium phosphate macroporous monoliths: Versatile synthesis, thermal expansion and mechanical properties

Zhu

Kanamori

Moitra

et al. 2016

Microporous and Mesoporous Materials

View full text Add to dashboard Cite

A versatile synthetic method has been developed for the fabrication of metal zirconium phosphate (MZP) macroporous monoliths via a sol-gel process accompanied by phase separation. More than 30 kinds of MZP monolithic polycrystalline monoliths with co-continuous macroporous structure have been synthesized by simply adding the target metal salt in the starting solution with optimized compositions. Glycerol, due to its high boiling point, plays the key role as the solvent to prevent metal salt from recrystallization, allowing a homogeneous distribution of metal salts over the polymerizing zirconium phosphate network. Hierarchically porous polycrystalline strontium zirconium phosphate (SrZrP) monolith has been obtained when the dried gel was calcined at 800 °C. Very low thermal expansion (coefficient of thermal expansion (CTE) as 1.4 × 10 −6 K −1) over a wide temperature range (38 °C to 1000 °C) together with good mechanical properties (flexural modulus as 8.0 GPa from 3 point bending test and Young's modulus as 1.9 GPa from uniaxial compression test) has been demonstrated, while high porosity (43 %) due to the presence of macropores reduces bulk density. As compared with dense ceramics of the same composition, the CTE value is lower and can be attributed to the presence of nanometer-sized small pores, which absorbs the anisotropic thermal expansion of each crystallite in the macropore skeletons at elevated temperatures.

show abstract

Thermophysical Properties of NZP Ceramics (A Review)

Cited by 43 publications

References 19 publications

Low Temperature Synthesis of Porous NZP Ceramics

Low Temperature Synthesis of Porous NZP Ceramics

Framework flexibility of sodium zirconium phosphate: role of disorder, and polyhedral distortions from Monte Carlo investigation

Metal zirconium phosphate macroporous monoliths: Versatile synthesis, thermal expansion and mechanical properties

Contact Info

Product

Resources

About