Abstract: A powder for coating or sintering has a peak assigned to cubic Y3Al5O12 and a peak assigned to orthorhombic YAlO3 exhibited in X-ray diffractometry, and the intensity ratio of the peak assigned to the (112) plane of the orthorhombic YAlO3 to the peak assigned to the (420) plane of the cubic Y3Al5O12 is at least 0.01 and less than 1. Alternatively, a powder for coating or sintering includes a composite oxide of yttrium and aluminum, and the volume of pores with a pore size of from 0.1 to 1 ?m of the powder is at least 0.16 mL/g. It is preferable that, in X-ray diffractometry using CuK? radiation with a scan range of 2?=20° to 60°, a peak assigned to the cubic Y3Al5O12 is a peak that shows the highest peak intensity.

Abstract: A film-forming material of the present invention contains an oxyfluoride of yttrium represented by YOXFY (X and Y are numbers satisfying 0<X and X<Y) and YF3, wherein a ratio I2/I1 of a peak height I2 of the (020) plane of YF3 to a peak height I1 of the main peak of YOXFY as analyzed by XRD is from 0.005 to 100. It is preferable that a ratio I4/I1 of a peak height I4 of the main peak of Y2O3 to the peak height I1 of the main peak of YOXFY as analyzed by XRD is 0.01 or less.

Abstract: A sintered body contains perovskite YAlO3 (YAP) as a main phase exhibited in X-ray diffractometry, and has a Vickers hardness of 11 GPa or more. In the case where the sintered body contains a composition other than YAlO3, the composition preferably substantially consists of Y3Al5O12 and Y4Al2O9. The sintered body preferably has an absolute density of 5.1 g/cm3 or more. The sintered body preferably has an open porosity of 1% or less, and also preferably has an average crystal grain size of 10 ?m or less.

Abstract: A material for cold spraying contains a powder of a compound of a rare earth element with a specific surface area of 30 m2/g or more as determined by a BET single-point method. The powder preferably has a volume of pores with a pore size of 3 to 20 nm of 0.08 cm3/g or more as determined by a gas absorption method. The powder also preferably has a crystallite diameter of 25 nm or less. The powder also preferably has a repose angle of from 10 to 60°. In the L*a*b* color system, the powder also preferably has a value L of 85 or more, a value a of from ?0.7 to 0.7, and a value b of from ?1 to 2.5.

Abstract: A powder for coating or sintering exhibits a peak assigned to orthorhombic YAlO3 in an X-ray diffractometry. Of peaks exhibited in the X-ray diffractometry, the peak assigned to the (112) plane of orthorhombic YAlO3 is a peak that has the highest peak intensity. Preferably, the value of the ratio of S2 to S1, S2/S1, is less than 1 in an X-ray diffractometry using CuK? radiation, where SI represents the peak intensity of the peak assigned to the (112) plane of orthorhombic YAlO3 and S2 represents the peak intensity of the peak assigned to the (104) plane of trigonal Al2O3.

Abstract: A film-forming material of the present invention contains an oxyfluoride of yttrium represented by YOFY (X and Y are numbers satisfying 0<X and X<Y) and YF3, wherein a ratio I2/I1 of a peak height I2 of the (020) plane of YF3 to a peak height I1 of the main peak of YOXFY as analyzed by XRD is from 0.005 to 100. It is preferable that a ratio I4/I1 of a peak height I4 of the main peak of Y2O3 to the peak height I1 of the main peak of YOXFY as analyzed by XRD is 0.01 or less.

Abstract: The present invention relates a coating powder comprising a rare earth oxyfluoride (Ln-O—F) and having: an average particle size (D50) of 0.1 to 10 ?m, a pore volume of pores having a diameter of 10 ?m or smaller of 0.1 to 0.5 cm3/g as measured by mercury intrusion porosimetry, and a ratio of the maximum peak intensity (S0) assigned to a rare earth oxide (LnxOy) in the 2? angle range of from 20° to 40° to the maximum peak intensity (S1) assigned to the rare earth oxyfluoride (Ln-O—F) in the same range, S0/S1, of 1.0 or smaller in powder X-ray diffractometry using Cu-K? rays or Cu-K?1 rays.

Abstract: A powder for coating or sintering has a peak assigned to cubic Y3Al5O12 and a peak assigned to orthorhombic YAlO3 exhibited in X-ray diffractometry, and the intensity ratio of the peak assigned to the (112) plane of the orthorhombic YAlO3 to the peak assigned to the (420) plane of the cubic Y3Al5O12 is at least 0.01 and less than 1. Alternatively, a powder for coating or sintering includes a composite oxide of yttrium and aluminum, and the volume of pores with a pore size of from 0.1 to 1 ?m of the powder is at least 0.16 mL/g. It is preferable that, in X-ray diffractometry using CuK? radiation with a scan range of 2?=20° to 60°, a peak assigned to the cubic Y3Al5O12 is a peak that shows the highest peak intensity.

Abstract: A material for cold spraying contains a powder of a compound of a rare earth element with a specific surface area of 30 m2/g or more as determined by a BET single-point method. The powder preferably has a volume of pores with a pore size of 3 to 20 nm of 0.08 cm3/g or more as determined by a gas absorption method. The powder also preferably has a crystallite diameter of 25 nm or less. The powder also preferably has a repose angle of from 10 to 60°. In the L*a*b* color system, the powder also preferably has a value L of 85 or more, a value a of from ?0.7 to 0.7, and a value b of from ?1 to 2.5.

Abstract: A film-forming material of the present invention contains an oxyfluoride of yttrium represented by YOXFY (X and Y are numbers satisfying 0<X and X<Y) and YF3, wherein a ratio I2/I1 of a peak height I2 of the (020) plane of YF3 to a peak height I1 of the main peak of YOXFY as analyzed by XRD is from 0.005 to 100. It is preferable that a ratio I4/I1 of a peak height I4 of the main peak of Y2O3 to the peak height I1 of the main peak of YOXFY as analyzed by XRD is 0.01 or less.

Abstract: A film-forming material of the present invention contains an oxyfluoride of yttrium represented by YOXFY (X and Y are numbers satisfying 0<X and X<Y) and YF3, wherein a ratio I2/I1 of a peak height I2 of the (020) plane of YF3 to a peak height I1 of the main peak of YOXFY as analyzed by XRD is from 0.005 to 100. It is preferable that a ratio I4/I1 of a peak height I4 of the main peak of Y2O3 to the peak height I1 of the main peak of YOXFY as analyzed by XRD is 0.01 or less.

Abstract: The present invention relates a coating powder comprising a rare earth oxyfluoride (Ln-O—F) and having: an average particle size (D50) of 0.1 to 10 ?m, a pore volume of pores having a diameter of 10 ?m or smaller of 0.1 to 0.5 cm3/g as measured by mercury intrusion porosimetry, and a ratio of the maximum peak intensity (S0) assigned to a rare earth oxide (LnxOy) in the 2? angle range of from 20° to 40° to the maximum peak intensity (S1) assigned to the rare earth oxyfluoride (Ln-O—F) in the same range, S0/S1, of 1.0 or smaller in powder X-ray diffractometry using Cu-K? rays or Cu-K?1 rays.

Abstract: A film-forming material of the present invention contains an oxyfluoride of yttrium represented by YOXFY (X and Y are numbers satisfying 0 <X and X <Y) and YF3, wherein a ratio I2/I1 of a peak height I2 of the (020) plane of YF3 to a peak height Ii of the main peak of YOXFY as analyzed by XRD is from 0.005 to 100. It is preferable that a ratio I4/I1 of a peak height I4 of the main peak of Y2O3 to the peak height I1 of the main peak of YOXFY as analyzed by XRD is 0.01 or less.

Abstract: The present invention relates a coating powder comprising a rare earth oxyfluoride (Ln-O—F) and having: an average particle size (D50) of 0.1 to 10 ?m, a pore volume of pores having a diameter of 10 ?m or smaller of 0.1 to 0.5 cm3/g as measured by mercury intrusion porosimetry, and a ratio of the maximum peak intensity (S0) assigned to a rare earth oxide (LnxOy) in the 2? angle range of from 20° to 40° to the maximum peak intensity (S1) assigned to the rare earth oxyfluoride (Ln-O—F) in the same range, S0/S1, of 1.0 or smaller in powder X-ray diffractometry using Cu-K? rays or Cu-K?1 rays.