Monoclinic Cell Research Articles

Effect of sulfurization time on the performance of monoclinic Cu2SnS3 solar cells

In this study, monoclinic (M)-Cu2SnS3 (CTS) thin films were prepared by high vacuum (10 Pa) rapid thermal sulfurization of sputtered Cu/Sn/Cu metallic layers. The effect of sulfurization time (1 min, 5 min, 10 min, and 20 min) on the crystal structure, morphology, optical studies, and electrical studies of the M-CTS thin films was investigated. The structural studies assessed the formation of M-CTS single phase for the films sulfurized ≥10 min and the secondary phases in addition to M-CTS at shorter sulfurization durations of ≤5 min. The single phase M-CTS films sulfurized at 10 min showed dense morphology and had a band gap energy of 0.92 eV. The present results indicated that the short sulfurization time of 10 min is sufficient for the formation of single phase M-CTS thin films. The fabricated M-CTS solar cell showed a PCE of 0.51% for the films sulfurized at 10 min.

Iron(II) and 1,1,1-Tris(2-pyridyl)nonadecane Complex Showing an Order-Disorder-Type Structural Transition and Spin-Crossover Synchronized over Both Conformers.

The title compound (Me4N)[Fe{(2-py)3C- n-C18H37}(NCS)3] having a C18 chain underwent spin-crossover (SCO). There are two crystallographically independent molecules in a triclinic cell at 100 K but only one in a monoclinic cell at 300 K. The complex showed a gradual one-step SCO in the same temperature region as that of the structural transition. The SCO is supported with the 57Fe Mössbauer spectroscopy. The molecules are differentiated on cooling, but the SCO was synchronized.

Non-Metamict Aeschynite-(Y), Polycrase-(Y), and Samarskite-(Y) in NYF Pegmatites from Arvogno, Vigezzo Valley (Central Alps, Italy)

At Arvogno, Vigezzo valley in the Central Alps, Italy, pegmatite dikes are unique in the scenario of a tertiary alpine pegmatite field because they show marked geochemical and mineralogical niobium–yttrium–fluorine features. These pegmatites contain AB2O6 aeschynite group minerals and ABX2O8 euxenite group minerals as typical accessory minerals including aeschynite-(Y), polycrase-(Y), and samarskite-(Y). They are associated with additional typical minerals such as fluorite, Y-dominant silicates, and xenotime-(Y). The Y–Nb–Ti–Ta AB2O6 and ABX2O8 oxides at the Arvogno pegmatites did not exhibit any textural and compositional features of oxidation or weathering. They are characterized by low self-radiation-induced structural damage, leading to the acquisition of unit-cell data for aeschynite-(Y), polycrase-(Y), and samarskite-(Y) by single-crystal X-ray diffraction. Aeschynite-(Y) and polycrase-(Y) crystals allowed for both to provide space groups whereas samarskite-(Y) was the first crystal from pegmatites for which cell-data were obtained at room temperature but did not allow for the accurate determination of the space group. According to the chemical compositions defined by Ti-dominant content at the B-site, the cell parameters, respectively, corresponded to polycrase-(Y), aeschynite-(Y), and the monoclinic cell of samarskite-(Y). Emplacement of Alpine pegmatites can be related to the progressive regional metamorphic rejuvenation from east to west in the Central Alps, considering the progressive cooling of the thermal Lepontine Barrovian metamorphic dome. Previous studies considered magmatic pulses that led to emplace the pegmatite field in the Central Alps. As an example, the pegmatites that intruded the Bergell massif were aged at 28–25 millions of years or younger, around 20–22 m.y.

Synthesis and structures of sodium containing K2-xNaxMg2(SO4)3 langbeinite phases

In this work we report a detailed structural study of the K2-xNaxMg2(SO4)3 series in order to evaluate the effect of Na incorporation on the structure. The results show that the cubic langbeinite structure is observed at room temperature for high Na levels; K2-xNaxMg2(SO4)3 (0 ≤ x ≤ 1.8). Increasing the Na content further, 1.8 < x ≤ 1.9, leads to significant structural distortions, with the observation of an enlarged orthorhombic cell. These latter systems resemble a highly distorted variant of the langbeinite structure, and this relationship is also illustrated by the fact that they transform to the cubic langbeinite structure at relatively low temperature (≈200 °C). In conjunction with our prior studies on Na2Mg2(SO4)3 (complex monoclinic cell, which also transforms to langbeinite at elevated temperature), this work highlights the flexibility of the langbeinite structure to accommodate high levels of Na ions, thus offering another potential avenue to manipulate the properties of materials with this structure-type.

A Novel Sodium and Chromium Borophosphate Na{Cr[BP2O7(OH)3]}: Synthesis, Crystal Structure, Hydrogen Bonding, and Comparative Crystal Chemistry

A novel sodium and chromium borophosphate, obtained by hydrothermal synthesis in the Na2O–P2O5–B2O3–Cr2O3–Н2О system, has been investigated using X-ray diffraction and IR spectroscopy. The monoclinic cell parameters are found to be a = 10.4220(3) A, b = 8.2468(2) A, c = 9.2053(3) A, β = 116.568(4)°, and V = 707.63(4) A3; sp. gr. С2/с. The structure is interpreted and refined to the final reliability factor R1 = 2.23% in the anisotropic approximation of atomic displacements using 1311 reflections, I > 2σ(I). The novel compound is relative to the family of alkaline borophosphates with the general formula A{M[BP2O7(OH)3]} (A is an alkaline or alkaline-earth element; M is a transition метал) and is described by the crystallochemical formula (Z = 4) Na{Cr[BP2O7(OH)3]}, where the compositions of borophosphate anion and microporous framework are in square brackets and braces, respectively. The presence of alternative systems of strong symmetric hydrogen bonds is established; the localization of all hydrogen atomic sites has made it possible to analyze them in detail. An additional electron density peak is found, which can be interpreted as a statistically distributed proton H+. The IR spectrum is characteristic of compounds with strong hydrogen bonding; it confirms the statistical proton distribution over subsites around the inversion center. It is suggested that representatives of this family may possess proton conductivity.

A neutron diffraction demonstration of long-range magnetic order in the quasicrystal approximant DyCd6

We have used neutron powder diffraction to demonstrate the existence of long-range antiferromagnetic order of Ising-like Dy moments in the DyCd6 quasicrystal approximant phase. This cubic compound undergoes a slight distortion to a monoclinic cell at low temperatures. The Néel temperature is 18.0(2) K and the magnetic order of the Dy sublattice may be described in the parent cubic Im3¯ structure using a combination of two propagation vectors, k1 = [0 0 0] and k2 = [12 0 12], yielding ‘anti-I’ order. Alternatively, when referred to the monoclinic C2/c cell, the magnetic structure may be described by a single propagation vector: k = [1 0 0].

The effect of different Cu/Sn ratios on the properties of monoclinic Cu2SnS3 thin films and solar cells fabricated by the sol–gel method

Ternary Cu2SnS3 (CTS) is a promising material for thin-film solar cells because it consists of nontoxic and earth-abundant elements. The present paper reports the preparation of monoclinic CTS thin films by a sol–gel solution-based method. The effects of the Cu/Sn atomic ratio on the structure and morphology were investigated. As the atomic ratio of Cu/Sn varied from 1.6 to 2.0, the compactness of the CTS films improved; furthermore, secondary phases, such as SnS, gradually disappeared; and the grain size of the films decreased. The CTS film with a Cu/Sn ratio of 1.9 showed a monoclinic structure with homogeneous morphology and a band gap of 1.12 eV, yielding a power conversion efficiency of 0.58%. These results could pave the way for the development of CTS thin-film solar cells.

Synthesis and emissive properties of bi-directed azomethine iron(III) complexes based on salicylidene-4-biphenylcarboxylic acid

A new azomethine iron (III) complexes based on esters of biphenyl-4-carboxylic acid and NO3−, Cl−, PF6− counter-ions were synthesized. The complexation of iron salts with Schiff base proceeds in binary solvent and leads to production of biligand systems with two functional centers which determine of perspective properties. The structure and purity of the obtained intermediate products and metal complexes were confirmed by FT-IR, NMR spectroscopy, chromatography, elemental analyses, and MALDI-ToF-MS method. Thermal properties of compounds were studied by differential scanning calorimetry and thermal gravimetric analysis. The X-ray powder analysis of polycrystalline complexes was carried out at room temperature. It is indexing showed that the crystal cells of all complexes are monoclinic and unit cells contain 4 molecules each. To better understand the results of the spectroscopic measurements, quantum chemical calculations were carried out. The values of Stokes shift and quantum yield of fluorescence were estimated.

Hydration-induced interpolytype transformations in the bayerite-derived nitrate-intercalated layered double hydroxide of Li and Al

The bayerite-derived layered double hydroxide of Li and Al crystallizes in a hexagonal structure (space group P3¯1m) on temperature induced dehydration. The metal hydroxide layers are stacked one above another [stacking vector (0, 0, 1)] in this crystal and the nitrate ion is intercalated with its molecular plane parallel to the metal hydroxide layer. On hydration, (i) there is an expansion in the basal spacing, and (ii) a translation of successive metal hydroxide layers by (1/3, 0, 1) relative to one another. Additionally numerous weak reflections emerge in the powder X-ray diffraction pattern possibly signifying a massive change in the packing of atoms in the interlayer. Partial structure refinement using only the major Bragg reflections suggests that the crystal adopts a structure of monoclinic symmetry (space group C2/m) with the nitrate ion oriented with its molecular plane perpendicular to the metal hydroxide layer. The complete pattern could be indexed to a cell of orthorhombic symmetry (space group P222) but the structure could not be refined for want of a structure model. The absence of a rational relationship between the cell parameters of the orthorhombic and monoclinic cells suggests that the hydrated phase crystallizes in either an incommensurate structure or in an entirely different crystal structure.

A study of optical properties of Sm3+ -doped M′ -type structure YTaO4 powders synthesized by the disodium tetraborate flux method

The Y1-xSmxTaO4 (x = 0.1, 0.5, 1.0, 2.0 and 5.0) compounds have been synthesized by conventional solid state method using disodium tetraborate as flux. The growth process of title compounds was studied using X-ray diffraction and electron microscopy (SEM and TEM). The powder diffraction pattern was indexed on a monoclinic cell, space group P2/a, lattice parameters: a = 5.302, b = 5.454 and c = 5.115 Å, Z = 2 and V = 146.97 Å3. The absorption (300 K) and fluorescence spectra (5 and 300 K) as well as the fluorescence dynamics of the Sm3+:YTaO4 are presented and analysed in detail. The room-temperature absorption spectra have been analysed using the Judd-Ofelt approach. The intensity parameters have been evaluated and subsequently used to calculate fundamental spectroscopic parameters: the spontaneous transition probabilities, the branching ration, emission cross-sections and natural lifetime for the 4G(4)5/2 emitting level. The luminescence spectra recorded between 5 and 300 K are composed of transitions from the 4G(4)5/2 level to the 6H5/2, 6H7/2, 6H9/2, 6H11/2, 6H13/2, 6H15/26F1/2, 6F3/2 and 6F5/2 levels. The maximum emission cross-section has been calculated to be 0.935 and 0.985 × 10−21 cm2 at 609.1 and 657.1 nm, respectively. The electron–phonon coupling parameter α¯ was found to be in the range 127–512 cm−1 for the 4G(4)5/2 → 6H5/2, 4G(4)5/2 → 6H7/2 and 4G(4)5/2 → 6H9/2 transitions.

Crystal structure of Ce-doped (La,Gd)2Si2O7 grown by the Czochralski process

Single crystals of (La0.25Gd0.75)2Si2O7 and (La0.235Ce0.015Gd0.75)2Si2O7 were grown by the Czochralski method. Structure analysis of the single crystals by X-ray diffraction (XRD) revealed that (La0.25Gd0.75)2Si2O7 and (La0.235Ce0.015Gd0.75)2Si2O7 crystalize in monoclinic cells (space group P21/c), a = 5.3905(8) Å, b = 8.5605(11) Å, c = 13.957(2) Å, β = 112.223(6)º, and a = 5.3921(7) Å, b = 8.5688(10) Å, c = 13.9172(14) Å, β = 111.980(5)º, respectively. One of the two different rare-earth sites is preferentially occupied by La and Gd atoms or by La, Ce and Gd atoms, and the other is occupied by Gd atoms only. Peaks attributed to the 4f-4f transitions (8S7/2–6G7/2 and 8S7/2–6Ix) of Gd3+ and 4f-5d transitions of Ce3+ were observed in the absorption spectra of (La0.25Gd0.75)2Si2O7 and (La0.235Ce0.015Gd0.75)2Si2O7 single crystals.

Monoclinic polymorph of chlorido-(dimethyl sulfoxide-κO)tri-phenyl-tin(IV).

The crystal structure of the title tin complex, [Sn(C6H5)3Cl(C2H6OS)], (I), has been reported with one mol-ecule in the asymmetric unit in an ortho-rhom-bic cell [Kumar et al. (2009 ▸). Acta Cryst. E65, m1602-m1603]. While using SnPh3Cl as a starting material for a reaction for which the products were recrystallized over a very long time (six months) from dimethyl sulfoxide (DMSO), a new polymorph was obtained for (I), with two independent mol-ecules in the asymmetric unit of a monoclinic cell. The coordination geometry of the Sn centres remains unchanged, with the Cl- ion and the DMSO mol-ecule in the apical positions and the phenyl C atoms in the equatorial positions of a trigonal bipyramid. The main difference between the polymorphs is the relative orientation of the phenyl rings in the equatorial plane, reflecting a degree of free rotation of these groups about their Sn-C bonds. In the crystal, mol-ecules are linked into [010] chains mediated by weak C-H⋯O inter-actions.

Synthesis, structure and topological analysis of glycine templated highly stable cadmium sulfate framework: A New Lewis Acid catalyst

One new open-framework two-dimensional layer, [Cd(NH3CH2COO)(SO4)], I, has been synthesized using amino acid as templating agent. Single crystal structural analysis shows that the compound crystallizes in monoclinic cell with non-centrosymmetric space group P21, a = 4.9513(1) Å, b = 7.9763(2) Å, c = 8.0967(2) Å, β = 105.917(1)° and V = 307.504(12) Å3. The compound has connectivity between the Cd-centers and the sulfate units forming a two-dimensional layer structure. Sulfate unit is coordinated to metal center with η3, μ4 mode possessing a coordination free oxygen atom. The zwitterionic form of glycine molecule is present in the structure bridging with two metal centers through μ2-mode by carboxylate oxygens. The topological analysis reveals that the two-dimensional network is formed with a novel 4- and 6-connected binodal net of (32,42,52)(34,44,54,63) topology. Although one end of the glycine molecule is free from coordination, the structure is highly stable up to 350 °C. Strong N-H⋯ O hydrogen bonding interactions play an important role in the stabilization and formation of three-dimensional supramolecular structure. The cyanosilylation of imines using the present compounds as heterogeneous catalyst indicates good catalytic behavior. The present study illustrates the usefulness of the amino acid for the structure building in less studied sulfate based framework materials as well as designing of new heterogeneous catalysts for the broad application. The compound has also been characterized through elemental analysis, PXRD, IR, SEM and TG-DT studies.

Synthesis, crystal structure, and luminescence properties of a new nitride polymorph, β-Sr0.98Eu0.02AlSi4N7

Prismatic vermilion single crystals 200µm–2mm in size, together with a white powder, were obtained by heating a mixture of binary nitrides containing Mg3N2 at 2030°C under 0.85MPa of N2. Yellow, thick-platelet single crystals with sizes of 150–500µm were also found to grow at or near the surface of the product. Single crystal X-ray diffraction demonstrated that the vermilion crystals were orthorhombic Sr0.98Eu0.02AlSi4N7, which has been prepared in previous studies and is termed the α phase of this compound. The yellow crystals were revealed to be a new polymorph of Sr0.98Eu0.02AlSi4N7 (β phase) that crystalized in a monoclinic cell (a = 8.1062(1) Å, b = 9.0953(1) Å, c = 8.9802(2) Å, β = 111.6550(5)°, space group P21) with twins that could be examined by transmission and scanning transmission electron microscopy. β-Sr0.98Eu0.02AlSi4N7 was found to have a three-dimensional network structure formed by the stacking of two types of layers. One is a dreier layer of (Al/Si)N4 tetrahedra that consists of N vertex-sharing double chains of (Al/Si)N4 tetrahedra extending in the c-axis direction with Sr and Eu atoms aligned between the chains, while the other is a layer of (Al/Si)N4 tetrahedra connected by sharing N edges and vertexes. The crystal structure of β-Sr0.98Eu0.02AlSi4N7 is similar to those of certain oxynitrides, such as Sr3Al3+xSi13−xN21−xO2+x:Eu2+ (x ≈ 0) and Sr4.9Eu0.1Al5+xSi21−xN35−xO2+x (x ≈ 0). The peak wavelength and full width at half maximum in the emission spectrum obtained from single crystals of β-Sr0.98Eu0.02AlSi4N7 under excitation at 400nm were 541 and 66nm, respectively.

Solubility in Different Solvents, Crystal Polymorph and Morphology, and Optimization of Crystallization Process of AIBN

The solubility of 2,2′-azobisisobutyronitrile (AIBN) in pure methanol, ethanol, acetone, benzene, ethyl acetate, and a mixture of methanol and water was measured in the temperature range from 268.15 to 325.15 K at atmospheric pressure. The AIBN solubility was sensitive to the temperature in all pure solvents. The solubility in the binary mixture of methanol and water increased as the methanol fraction and temperature increased. The data were correlated with the modified Apelblat, Van’t Hoff, and Buchowski–Ksiazczak λh equations. Other results showed that two AIBN polymorphs formed after the crystallization: form I, in a monoclinic cell, and form II, in a triclinic cell, which confirmed the two AIBN crystal structures reported in the literature. Additionally, the initial concentration and cooling rate of the AIBN crystallization had dominant roles in affecting the polymorphic forms of the AIBN crystals. The crystallization conditions were optimized in a 2 L crystallizer to yield crystals with the desired m...

Raman signatures of monoclinic distortion in (Ba1−xSrx)3CaNb2O9 complex perovskites

Octahedral tilting is the most common distortion process observed in centrosymmetric perovskite compounds. Indeed, crucial physical properties of this oxide stem from the tilts of BO6 rigid octahedra. In microwave ceramics with perovskite‐type structure, there is a close relation between the temperature coefficient of resonant frequency and the tilt system of the perovskite structure. However, in many cases, limited access facilities are needed to assign correctly the space group, including neutron scattering and transmission electron microscopy. Here, we combine the Raman scattering and group theory calculations to probe the structural distortion in the perovskite (Ba1−xSrx)3CaNb2O9 solid solution, which exhibits a structural phase transition at x ≥ 0.7, from D3d3 trigonal to C2h3 monoclinic cell. Both phases are related by an octahedral tilting distortion (a0b−b− in Glazer notation). Low‐temperature Raman spectra corroborate the group‐theoretical predictions for Sr3CaNb2O9 compound because 36 modes detected at 25 K agree well with the 42 (25Ag ⊕ 17Bg) predicted ones. Copyright © 2017 John Wiley &amp; Sons, Ltd.

New Mineral Names

### Dashkovaite* N.V. Chukanov, D.I. Belakovsky, S.V. Malinko, N.I. Organova (2000) Dashkovaite Mg(HCO3)2·2H2O — A new formate mineral. Zapiski Vseross. Mineral. Obshch., 129(6), 49–53 (in Russian, English abs.). Chemical analysis gave C 16.2, H 3.9, Mg 16.4, Mn (by electron microprobe) 0.2, O (by difference) 63.3, sum 100 wt%, corresponding to Mg1.00Mn0.01H5.74C2.00O5.87, ideally Mg(HCO3)2 2H2O. The mineral occurs as white, fibrous aggregates in hydrothermal veinlets, up to 1 mm in width, wherein the fibers are up to 3 mm long and 0.01 mm wide. Soft and porous, H = 1, D calc = 1.74 g/cm3 for Z = 4. Microscopically colorless, biaxial positive, α = 1.465(3), α = 1.486(3), γ = 1.516(3), 2 V calc = 81(5)°, X parallel to the elongation. By analogy with the synthetic analog, indexing of the X-ray powder pattern gave a monoclinic cell, space group P 21/ c , a = 8.64(1), b = 7.15(1), c = 9.38(1) A, α = 98.0(1) °; strongest lines of the pattern (57 mm camera, Fe K α radiation) are 4.90(90,111), 4.64(80,002), 4.30(70,200), 3.68(80,210), and 3.40(100,112). The IR spectrum is similar to that of the synthetic compound. The mineral occurs with shabynite, iowaite, ekaterinite, korshunovskite, halite, hydromagnesite, and serpentine in dolomite marble at the Korshunovskoye boron deposit in the Irkutsk district, Siberia. The new mineral name is for E.R. Dashkova (1744–1810), former Director of the Saint Petersburg Academy of Sciences (1783–1796) and President of the Russian Academy of Sciences. Type material is in the Fersman Mineralogical Museum, Moscow, Russia. J.L.J. ### Fluorannite* Ganfu Shen, Qi Lu, Jinsha Xu (2000) Fluorannite: A new mineral of the mica group from the western suburb of Suzhou City. Acta Petrologica Mineral., 19(4), 355–362 …

Green approach for synthesis of bioactive Hantzsch 1,4-dihydropyridine derivatives based on thiophene moiety via multicomponent reaction.

A novel green and efficient one-pot multicomponent reaction of dihydropyridine derivatives was reported as having good to excellent yield. In the presence of the catalyst ceric ammonium nitrate (CAN), different 1,3-diones and same starting materials as 5-bromothiophene-2-carboxaldehyde and ammonium acetate were used at room temperature under solvent-free condition for the Hantzsch pyridine synthesis within a short period of time. All compounds were evaluated for their in vitro antibacterial and antifungal activity and, interestingly, we found that 5(b–f) show excellent activity compared with Ampicillin, whereas only the 5e compound shows excellent antifungal activity against Candida albicans compared with griseofulvin. The cytotoxicity of all compounds has been assessed against breast tumour cell lines (BT-549), but no activity was found. The X-ray structure of one such compound, 5a, viewed as a colourless block crystal, corresponded accurately to a primitive monoclinic cell.

Magnetism of CuCl2·2D2O and CuCl2·2H2O, and of CuBr2·6H2O

The magnetic properties of little examined CuCl2·2D2O are studied and compared with those of CuCl2·2H2O. New CuBr2·6H2O is also examined. Susceptibility maxima appear for chlorides at 5.35 and 5.50K, in the above order, with estimated antiferromagnetic ordering at 4.15 and 4.25K. Curie-Weiss fits yield g of 2.210 and 2.205, and Weiss θ of −6.0 and −4.7K, respectively, in χM=C/(T−θ). One-dimensional Heisenberg model fits to susceptibilities, including interchain exchange in a mean-field approximation, are performed. Interchain exchange is significant but much weaker than intrachain. The bromide hexahydrate strongly differs magnetically from any chloride hydrate, but exhibits notable similarities and differences compared to previously studied CuBr2. A broad susceptibility maximum occurs near 218K, only 4% lower than for CuBr2, but with almost twice the magnitude. Powder X-ray diffraction data for CuBr2·6H2O may be best accounted for by a monoclinic unit cell that is metrically orthorhombic. The volume per formula unit is consistent with trends in metal ionic radii. However, an alternative monoclinic cell with 5% smaller volume more readily rationalizes the magnetism.

Mixed sodium nickel-manganese sulfates: Crystal structure relationships between hydrates and anhydrous salts

The present contribution provides new structural and spectroscopic data on the formation of solid solutions between hydrated and dehydrated sulfate salts of sodium-nickel and sodium-manganese in a whole concentration range: Na2Ni1−xMnx(SO4)2·yH2O, 0≤ x≤1.0. Using powder XRD, electron paramagnetic resonance spectroscopy (EPR), IR and Raman spectroscopy it has been found that double sodium-nickel and sodium-manganese salts form solid solutions Na2Ni1−xMnx(SO4)2·4H2O with a blödite-type of structure within a broad concentration range of 0≤x≤0.49, while the manganese rich compositions Na2Ni1−xMnx(SO4)2·2H2O (0.97≤x≤1.0) crystallize in the kröhnkite-type of structure. The Ni-based blödites Na2Ni1−xMnx(SO4)2·4H2O dehydrate between 140 and 260°C into anhydrous salts Na2Ni1−xMnx(SO4)2, 0≤ x≤0.44, with a structure where Ni1−xMnxO6 octahedra are bridged into pairs by edge- and corner sharing SO42− groups. Both TEM and EPR methods show that the Ni2+ and Mn2+ ions are homogenously distributed over three crystallographic positions of the large monoclinic cell. The dehydration of the kröhnkite phase Na2Ni1−xMnx(SO4)2·2H2O yields the alluaudite phase Na2+δMn2-δ/2(SO4)3, where the Na-to-Mn ratio decreases and all Ni2+ dopants are released from the structure. The process of the dehydration is discussed in terms of structural aspects taking into account the distortion degree of the Ni,MnO6 and SO4 polyhedra.