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Result and Discussion The observed diffraction peaks of the NiZnFe2O4 nanoparticles were observed in the range of 2θ: 26.2°,30°, 35.3°,42.7°, 53.4°, 56.8°, and 62.3°, corresponding to the (200), (311), (111), (422), (511), and (440) which show the cubic crystal structure according to JCPDS card No.08.0234.
Fr=the number of grains of the same sizethe total number of items measured×100 (2) Figure 3.
However, after encapsulation, the wave number tends to shift to follow the smaller number, this indicates that it is between metal ions so that becomes weak [35].
Djuhana, “Reusability of Photocatalytic CoFe2O4 @ZnO Core–Shell Nanoparticles for Dye Degradation,” ECS J.
Bai, “Synthesis and photocatalytic activity of cobalt oxide doped ZnFe2O4-Fe2O3-ZnO mixed oxides,” Mater.

In case of Cu-MOF1/ Ag2O, the appearance of 38.08 °, 44.02 °, 64.45 ° and 77.64° diffraction peaks (For Ag2O - JCPDS card number 76–1393) along with Cu-MOFs indicating formation of Cu-MOF/Ag2O, and are also in good agreement with the literature [51, 56, 58] In addition, the weak diffraction peak of 10.38° assigned to (001) plane of GO cannot be found in the Cu-MOF/rGO composites because of the overlap of the strong peak at 10.34° associated with the Cu-MOF/rGO and appearance of peak at 26.98°confirmed presence of rGO in MOF/rGO composite (JCPDS no. 75−2078) [59].
Investigation of optical and thermal properties of CuO and ZnO nanoparticles prepared by Crocus Sativus (Saffron) flower extract.
Photocatalytic degradation of Rhodamine B (RhB) dye in waste water and enzymatic inhibition study using cauliflower shaped ZnO nanoparticles synthesized by a novel One-pot green synthesis method.
Synthesis and Fabrication of Y-Doped ZnO Nanoparticles and Their Application as a Gas Sensor for the Detection of Ammonia.
MOF-derived porous ZnO/Co3O4 nanocomposites for high performance acetone gas sensing.

Preparation of doped HAP by hybrid MgO-ZnO particles.
The XRD analysis confirmed a single-phased HAp according to JCPDS Card No. 09–0432.
This pattern demonstrates the effective creation of HAp and conforms to the Joint Committee on Powder Diffraction Standards patterns, International Center for Diffraction Data (JCPDS 21-1276, JCPDS 21-1272 & JCPDS 09-432), and also indicates semi-crystalline and crystalline structure with crystallinity of 48.57%, 56.64%, and 60.08%, respectively.
In addition, there was an increase in the overall number of pores produced.
The reinforcement of PLA polymer with co-doped HAp filler leads to an increase in the number of pores formed.

Because multi-valences of vanadium make it capable of forming several numbers of oxides and VO2 can appear as polymorph structures.
These peaks were at 20.4°, 21.8° and 41.3°, assigned to (001), (101) and (002) planes of the orthorhombic V2O5 (JCPDS File No. 41-1426).
All of three XRD peaks correspond to the trigonal structure of V2O3 with a space group R-3c (167) (JCPSD card no.84-0319).
These peaks confirm the formation of crystalline V2O5 films (JCPDS: 41-1426) with several planes.
Effect of thermal annealing on the structural and optical properties of ZnO thin films deposited by the reactive e-beam evaporation technique, Phys.

In a large number of preparation methods, solvothermal method is selected to prepare the sample.
The diffraction peak of the prepared W18O49 and W18O49@PEG are high in correspondence with the standard card (JCPDS 71-2450) and has no characteristic diffraction peaks of other impurities.
Fu, Enhanced Photocatalytic Ozonation Degradation of Organic Pollutants by ZnO Modified TiO2 Nanocomposites, Applied Catalysis B-Environmental. 221 (2018) 223-234
Xu, Influence of Stabilizer on the Microstructures and Photocatalytic Performance of Zno Nanopowder Synthesized by Sol-Gel Method, Journal of Nano Research. 50 (2017) 57-71
Niaz, Gadolinium Doped ZnO Nanocrystalline Powders and Its Photocatalytic Performance for Degradation of Methyl Blue under Sunlight, Journal of Ovonic Research. 10 (2014) 89-100

The rGO with a high number of oxygen functional groups produced in a short reduction time shows a faster response to analytes.
The hkl planes of rGO matched with JCPDS Card No. 75-2078 [25].
According to the JCPDS (75-2078) data the prominent peak is at 2ϴ (26.26).
It is observed that this prominent peak shows shift in its position with respective JCPDS.
Rezig, Structural and electrical properties of ZnO films prepared by screen printing technique, Thin Solid Films, 383(1-2) (2001) 92-94

Consequently, a great number of studies have been devoted to improve the mechanical properties of sintered HA 2-4.
Nevertheless, MgO peak corresponding to JCPDS card No. 43-1022 was detected in these samples and the intensity of the MgO was found to increase with increasing dopant addition in the HA matrix.
From the point of view of clinical applications as implant material, the presence of Mg ions could be beneficial as a number of studies have shown that there was an increase in interfacial strength for implant with hydroxyapatite surfaces enriched with magnesium 12.
Inter., Vol. 29, 2003, pp. 629-633 (5) Bandyopadhyay, A., Withey, E.A., Moore, J. and Bose, S., Influence of ZnO doping in calcium phosphate ceramics, Materials Science and Engineering: C, Vol. 27, 2007, pp. 14-17 (6) Manjubala, I. and Kumar, S.S., Effect of TiO2–Ag2O additives on the formation of calcium phosphate based functionally graded bioceramics, Biomaterials, Vol. 21, 2000, pp. 1995-2002 (7) Zreiqat, H., Howlett, C.R., Zannettino, A., Evans, P., Schulze-Tanzil, G. and Knabe, C., Mechanisms of magnesium-stimulated adhesion of osteoblastic cells to commonly used orthopaedic implants, J.

The stoichiometric amounts of the raw materials ZnO (A.R.), (NH4)2HPO4(A.R.), MnCO3(A.R.), Ga2O3(99.99%) were thoroughly mixed and grounded in an agate mortar.
Characterization All the crystalline structures of the samples were measured by a Rigaku D/max-III B X-ray powder diffractometer with CuKα1 (λ=1.5405Å) radiation and were coincident with γ-Zn3(PO4)2 phase in agreement with the respective Joint Committee on Powder Diffraction Standards (JCPDS-Card No. 30-1490).
All the diffraction peaks are assigned to the standard data of JCPDS NO.30-1490 and no characteristic peaks of the dopants are observed.
In γ-Zn3(PO4)2 hosts, the coordination number of Zn is 4 or 6.
The effective ionic radius is related to radius, coordination number, and valence.

The various morphologies of Cu2O some have been successfully synthesized, such as nanowires, multipods, nanocubes, octahedra, and cuboctahedra It has been demonstrated that the performance of catalysts can be enhanced by shape control as shape determines the number of atoms located at the edges, corners, or surfaces [6].
Fig. 1 shows XRD patterns of four kinds of Cu2O polyhedra as well as the standard card of cuprous oxide cubic phase (JCPDS No. 05-0667) [8].
The distance between two “Cu” atoms in (110) planes is about half of that in (111) planes, implying the number and a density of “Cu” dangling bonds in the (110) planes are higher than that of the (111) planes.
As compared with 8-facet, 26-facet Cu2O microcrystal have more edges and corners which could improve the photocatalytic activity, as demonstrated in previous studies on other materials, such as TiO2 and ZnO.

All samples exhibited distinct diffraction peaks that are characteristic of the anatase phase of titanium dioxide, as identified by the Standards (JCPDS card no. 01-073-1764).
While the peaks observed at 30.81°, 48.04°, and 54.28° in sample S3, corresponding to the plan (211), (321), and (230), respectively, confirmed the presence of the brookite phase, the data obtained were in agreement with the standard JCPDS (card no. 01-075-1582).
The data obtained were in agreement with the JCPDS standard (card no. 01-075-1532) for Ag2O.
While the peaks were observed at 63.16° and 68.85°, corresponding to the (222) and (321) crystal planes, as identified by the Standards (JCPDS card no. 00-018-0576) for AuTi3.
FESEM-derived particle size distribution histograms of samples a) S0, b) S1, c) S2, and d) S3, showing the number of particles (Count) as a function of particle size.