Nano and micro reoriented domains and their relation with the crystal structure in the new ferroelectric boracite Zn3B7O13Br

Campa-Molina, J.; Ulloa-Godínez, Sandra; Barrera, A.; Bucio, L.; Mata, J.

doi:10.1088/0953-8984/18/20/007

Cited by 7 publications

(6 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Full symbols indicate compounds that stay cubic below the magnetic ordering temperature (down to 2 K). References for M-X distances: Mg-Cl [15]; Cr-Cl (T = 100 K) [132]; Cr-Br [130]; Cr-I [138]; Mn-Cl [139]; Mn-Br [140]; Mn-I [131]; Fe-Cl [141]; Fe-Br [143]; Fe-I [150]; Co-Cl [133]; Co-Br [129]; Co-I (F43c1 ) [128]; Ni-Cl [129]; Ni-Br [151]; Ni-I [152]; Cu-Cl, no data known; Cu-Br (F43c1 ) [128]; Cu-I [147]; Zn-Cl [94]; Zn-Br [153].…”

Section: Crystal Structure Of Boracitesmentioning

confidence: 99%

Magnetic and structural phase transitions of multiferroic boracitesM3B7O13X(M=

Schnelle

Schmid

2015

Phys. Rev. B

View full text Add to dashboard Cite

The specific heat capacity of mostly single-crystalline samples of 21 boracite compounds M 3 B 7 O 13 X with M a 3d transition metal (Cr, Mn, Fe, Co, Ni, Cu, Zn) or Mg and X a halogen (Cl, Br, I) is determined. In combination with magnetic susceptibility data the magnetic ordering of the M 2+ ions at T N is investigated in detail. The fully ferroelectric/fully ferroelastic structural phase transitions at higher temperatures are measured by differential scanning calorimetry. In the Cr-Br, Cr-I, Cu-Cl, and Cu-Br compounds, previously unknown magnetic phases were found. Magnetic order in the boracites is characterized by the quantum and classical spin states of the M 2+ ions, a variable degree of structural distortion, orbital effects, and competing exchange interactions. The Cu-Cl, Cu-Br, and Ni-Cl boracites exhibit broad maxima of magnetic specific heat and of magnetic susceptibility above T N caused by low-dimensional or frustrated magnetic interactions. Co boracites display additional broad anomalies below T N originating from continuous spin reorientations and effective S = 1/2 ground states. Indications for spin reorientations are also observed for Fe boracites. New phases appear in high magnetic fields for some Co and Fe boracites, which is not the case for the Mn compounds. Stronger magnetic frustration is deduced for the cubic Cr compounds. For the latter compounds and Ni-I boracite magnetostructural phase transitions are observed.

show abstract

Section: Crystal Structure Of Boracitesmentioning

confidence: 99%

Magnetic and structural phase transitions of multiferroic boracitesM3B7O13X(M=

Schnelle

Schmid

2015

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…[35] The effect of the metal cations and halogens on the B-O bonds in the boracite structure was studied by IR spectroscopy. [36] Many of the boracites show ferroelectric properties [37] and some Raman studies have been undertaken to determine the ferroelectric phase transitions. [38][39][40] Vibrational spectroscopy has focused on the ferroelectric transitions.…”

Section: Introductionmentioning

confidence: 99%

Vibrational Spectroscopy of the Borate Mineral Priceite—Implications for the Molecular Structure

Frost

López

Scholz

et al. 2014

Spectroscopy Letters

View full text Add to dashboard Cite

Priceite is a calcium borate mineral and occurs as white crystals in the monoclinic pyramidal crystal system. We have used a combination of Raman spectroscopy with complimentary infrared spectroscopy and scanning electron microscopy with Energy-dispersive X-ray Spectroscopy (EDS) to study the mineral priceite. Chemical analysis shows a pure phase consisting of B and Ca only. Raman bands at 956, 974, 991, and 1019 cm À1 are assigned to the BO stretching vibration of the B 10 O 19 units. Raman bands at 1071, 1100, 1127, 1169, and 1211 cm À1 are attributed to the BOH in-plane bending modes. The intense infrared band at 805 cm À1 is assigned to the trigonal borate stretching modes. The Raman band at 674 cm À1 together with bands at 689, 697, 736, and 602 cm À1 are assigned to the trigonal and tetrahedral borate bending modes. Raman spectroscopy in the hydroxyl stretching region shows a series of bands with intense Raman band at 3555 cm À1 with a distinct shoulder at 3568 cm À1 . Other bands in this spectral region are found at 3221, 3385, 3404, 3496, and 3510 cm À1 . All of these bands are assigned to water stretching vibrations. The observation of multiple bands supports the concept of water being in different molecular environments in the structure of priceite. The molecular structure of a natural priceite has been assessed using vibrational spectroscopy.

show abstract

“…The effect of the metal cations and halogens on the B-O bonds in the boracite structure was studied by IR spectroscopy [12]. Many of the boracites show ferroelectric properties [13] and some Raman studies have been undertaken to determine the ferroelectric phase transitions [14][15][16]. Vibrational spectroscopy has focussed on the ferroelectric transitions [17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%