Large Volume CaMoO$_{4}$ Scintillation Crystals

Коржик, М. В.; Kornoukhov, V. N.; Missevitch, O.; Fedorov, A.; Annenkov, Alexander; Бузанов, О. А.; Borisevicth, A.E.; Dormenev, V.; Kholmetskii, Alexander; Kim, Sun Kee; Kim, Youngduk; Kim, Hongjoo; Bratyakina, A.V.

doi:10.1109/tns.2008.920428

Cited by 15 publications

(9 citation statements)

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“…These above facts clearly confirm that Gd 3+ -doped lead molybdato-tungstates are chemically compatible with Al and Ag electrodes. 4 or NaLu(WO 4 ) 2 doped with RE 3+ ions obtained by a combustion route when a final calcination occurred at 1073 or 1173 K within 2 h contained individual particles with the size up to 100 nm [37,38]. Probably, the main reason of a rapid grain growth of Pb 1-3x x Gd 2x (MoO 4 ) 1-3x (WO 4 ) 3x materials is their relatively low melting point and resulting small temperature difference between calcination process and melting.…”

Section: Methodsmentioning

confidence: 99%

Combustion synthesis, structural, magnetic and dielectric properties of Gd3+-doped lead molybdato-tungstates

et al. 2020

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Gd 3+-doped lead molybdato-tungstates with the chemical formula of Pb 1-3x x Gd 2x (MoO 4) 1-3x (WO 4) 3x (where x = 0.0455, 0.0839, 0.1430, corresponding to 9.53, 18.32, 33.37 mol% of Gd 3+ , respectively, as well as denotes cationic vacancies) were successfully synthesized via combustion route. The XRD and SEM results confirmed the formation of single-phase, tetragonal scheelite-type materials (space group I4 1 /a) with the uniform, spherical and oval grains ranging from 5 to 20 m. Individual grains are strongly agglomerated into big clusters with the size even above 50 m. The magnetic measurements as well as the Brillouin fitting procedure showed paramagnetic state with characteristic superparamagnetic-like behaviour and the short-range ferromagnetic interactions. The electrical and broadband dielectric spectroscopy studies revealed insulating properties with the residual electrical n-type conduction of 2×10-9 S/m and low energy loss (tan  0.01) below 300 K. Dielectric analysis showed that no dipole relaxation processes in the Gd 3+-doped materials were observed. A fit of dielectric loss spectra of Gd 3+-doped samples by sum of the conductivity and the Havriliak-Negami, Cole-Cole, and Cole-Davidson functions confirmed this effect.

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Section: Methodsmentioning

confidence: 99%

Combustion synthesis, structural, magnetic and dielectric properties of Gd3+-doped lead molybdato-tungstates

et al. 2020

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“…Metal molybdates form a wide and important class of inorganic materials that have a high application potential in various fields such as scintillator detectors, phosphors and electro-optic applications (Zhang et al 2015; Bavykina et al 2009; Zhou et al 2011; Danevich et al 2014; Belogurov et al 2005; Mikhailik et al 2007; Korzhik et al 2008; Lei and Yan 2008; Shivakumara et al 2015). Divalent metal molybdates with relatively large cations such as Ca 2+ , Sr 2+ , Ba 2+ and Pb 2+ (ionic radius above 99 pm) exist in scheelite-type structure (tetragonal symmetry, space group I4 1 /a ; Z = 4) where molybdenum ions adopt tetrahedral coordination, while divalent metal ions represent an eight-coordinated position (Sczancoski et al 2008; Sczancoski et al 2009; Ghosh et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Dielectric and magnetic characteristics of Ca1−xMnxMoO4 (0 ≤ x ≤ 0.15) nanomaterials

et al. 2018

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Scheelite-type Ca1−xMnxMoO4 (x = 0.0, 0.01, 0.05, 0.10 and 0.15) nanomaterials were successfully synthesized via a combustion route. Dielectric studies showed a weak n-type electrical conductivity characteristic for insulators and low relative permittivity (εr < 15) decreasing with increasing Mn2+ content. CaMoO4 and Mn2+-doped nanomaterials are chemically compatible with Al and Ag electrodes and promising for low-temperature co-fired ceramic applications. Magnetic studies showed, at room-temperature diamagnetism for pure CaMoO4, the balance between diamagnetism and paramagnetism for Ca1−xMnxMoO4 (x = 0.01) and paramagnetic behaviour when 0.05 ≤ x ≤ 0.15 as well as the short-range antiferromagnetic interactions growing in strength as Mn2+ content increases. The Landé factor fitting procedure showed a spin-only contribution to the magnetic moment. CaMoO4 matrix unexpectedly revealed the residual paramagnetism at low temperatures derived probably from the molybdenum ions having unpaired 4d electrons as well as a paramagnetic-diamagnetic transition at 70 K.

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“…Our first ISTC Project (#3293) was carried out between 2005 and 2007. A large, high-quality crystal (200 mm×30 mm×30 mm) was grown [93] and characterized [94]. In 2007, a KRISS (Korea Research Institute for Standards and Science) group specialized in advanced detector development joined our collaboration and initiated the development of cryogenic techniques for reading out CaMoO 4 crystals; results from their initial studies were published in Ref.…”

Section: Choice Of 100 Mo For 0νββ Experimentsmentioning

confidence: 99%

“…An extensive R&D program on the optimization of growth techniques for the large-sized CaMoO 4 crystals was carried out in the framework of ISTC program #3293 [93]. As part of this program, crystals as large as 30×30×200 mm 3 were successfully grown, as shown in Figs.…”

Section: Production Of High-purity Crystalsmentioning

confidence: 99%

Technical Design Report for the AMoRE $0νββ$ Decay Search Experiment

Alenkov¹,

Beyer²,

Olsen³

et al. 2015

Preprint

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The AMoRE (Advanced Mo-based Rare process Experiment) project is a series of experiments that use advanced cryogenic techniques to search for the neutrinoless double-beta decay of 100 Mo. The work is being carried out by an international collaboration of researchers from eight countries. These searches involve high precision measurements of radiation-induced temperature changes and scintillation light produced in ultra-pure 100 Mo-enriched and 48 Ca-depleted calcium molybdate ( 48depl Ca 100 MoO 4 ) crystals that are located in a deep underground laboratory in Korea. The 100 Mo nuclide was chosen for this 0νββ decay search because of its high Q-value and favorable nuclear matrix element. Tests have demonstrated that CaMoO 4 crystals produce the brightest scintillation light among all of the molybdate crystals, both at room and at cryogenic temperatures. 48depl Ca 100 MoO 4 crystals are being operated at milli-Kelvin temperatures and read out via specially developed metallic-magnetic-calorimeter (MMC) temperature sensors that have excellent energy resolution and relatively fast response times. The excellent energy resolution provides good discrimination of signal from backgrounds, and the fast response time is important for minimizing the irreducible background caused by random coincidence of two-neutrino double-beta decay events of 100 Mo nuclei. Comparisons of the scintillating-light and phonon yields and pulse shape discrimination of the phonon signals will be used to provide redundant rejection of alpha-ray-induced backgrounds. An effective Majorana neutrino mass sensitivity that reaches the expected range of the inverted neutrino mass hierarchy, i.e., 20-50 meV, could be achieved with a 200 kg array of 48depl Ca 100 MoO 4 crystals operating for three years.

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Large Volume CaMoO$_{4}$ Scintillation Crystals

Cited by 15 publications

References 1 publication

Combustion synthesis, structural, magnetic and dielectric properties of Gd3+-doped lead molybdato-tungstates

Combustion synthesis, structural, magnetic and dielectric properties of Gd3+-doped lead molybdato-tungstates

Dielectric and magnetic characteristics of Ca1−xMnxMoO4 (0 ≤ x ≤ 0.15) nanomaterials

Technical Design Report for the AMoRE $0νββ$ Decay Search Experiment

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