Abstract: An electrostatic charge image developer includes: a toner A incorporating toner particles and silica particles (A) as an external additive, the toner particles containing a binder resin and resin particles, and the silica particles (A) containing a nitrogen-containing compound containing the element molybdenum; and a carrier B incorporating a core and a coating resin layer, the coating resin layer covering the core and containing inorganic particles, and the ratio NMo/NSi is 0.035 or greater and 0.45 or less, where NMo and NSi are measured net intensities for the element molybdenum and the element silicon, respectively, in the silica particles (A) in x-ray fluorescence analysis.

Abstract: An electrostatic charge image developing toner contains toner particles that contain a binder resin and resin particles, fatty acid metal salt particles externally added to the toner particles, and silica particles (A) that are externally added to the toner particles and contain a nitrogen element-containing compound containing a molybdenum element, in which a ratio NMo/NSi of Net intensity NMo of the molybdenum element measured by X-ray fluorescence analysis to Net intensity NSi of a silicon element measured by X-ray fluorescence analysis is 0.035 or more and 0.45 or less.

Abstract: An electrostatic charge image developing toner contains toner particles that contain a binder resin and resin particles and silica particles (A) that are externally added to the toner particles and contain a nitrogen element-containing compound containing a molybdenum element, in which a ratio NMo/NSi of Net intensity NMo of the molybdenum element measured by X-ray fluorescence analysis to Net intensity NSi of a silicon element measured by X-ray fluorescence analysis is 0.035 or more and 0.45 or less.

Abstract: A toner for electrostatic image development includes: toner particles; perovskite compound particles externally added to the toner particles; and silica particles (S) that are externally added to the toner particles and include an elemental nitrogen-containing compound containing elemental molybdenum and in which the ratio NMo/NSi of a Net intensity NMo of elemental molybdenum that is measured by X-ray fluorescence analysis to a Net intensity NSi of elemental silicon that is measured by the X-ray fluorescence analysis is from 0.035 to 0.45 inclusive.

Abstract: An electrostatic charge image developing toner contains toner particles, fatty acid metal salt particles externally added to the toner particles, and silica particles (S) that are externally added to the toner particles and contain a nitrogen element-containing compound containing a molybdenum element, in which a ratio NMo/NSi of Net intensity NMo of the molybdenum element measured by X-ray fluorescence analysis to Net intensity NSi of a silicon element measured by X-ray fluorescence analysis is 0.035 or more and 0.45 or less.

Abstract: An electrostatic image developer includes: toner particles; silica particles that are externally added to the toner particles and include an elemental nitrogen-containing compound containing elemental molybdenum and in which the ratio (Mo/Si) of a Net intensity of elemental molybdenum that is measured by X-ray fluorescence analysis to a Net intensity of elemental silicon in the silica particles that is measured by the X-ray fluorescence analysis is from 0.035 to 0.45 inclusive; and a carrier having a relative dielectric loss factor of from 0.5 to 2.0 inclusive.

Abstract: An electrostatic charge image developing toner contains alkylsilane-treated silica particles, a branched aliphatic hydrocarbon having 7 or more and 18 or less carbon atoms, and toner particles.

Abstract: An electrostatic charge image developing toner contains alkylsilane-treated silica particles, cyclic siloxane, and toner particles.

Abstract: An electrostatic charge image developing toner contains alkylsilane-treated silica particles, a linear aliphatic hydrocarbon having 10 or more and 18 or less carbon atoms, and toner particles.

Abstract: An electrostatic charge image developing carrier includes a core material and a resin coating layer that contains strontium titanate particles and coats the core material, in which a content of the strontium titanate particles is 10% by mass or more and 55% by mass or less with respect to a total mass of the resin coating layer, and a proportion of strontium atoms within a surface of the resin coating layer, the proportion being determined by X-ray photoelectron spectroscopy, is 0.2 at % or more and 1.0 at % or less.

Abstract: A carrier for electrostatic image development includes: a core material; and a resin coating layer that contains nitrogen-containing silica particles and nitrogen-containing resin fine particles and covers the core material. The content of the nitrogen-containing silica particles is from 10% by mass to 55% by mass inclusive based on the total mass of the resin coating layer. The nitrogen-containing resin fine particles have a volume average particle diameter of from 100 nm to 250 nm inclusive. The mass ratio P/S of the mass P of the nitrogen-containing resin fine particles to the mass S of the nitrogen-containing silica particles is from 0.15 to 0.55 inclusive.

Abstract: An electrostatic charge image developer contains toner particles, silica particles that are added to an exterior of the toner particles and contain a nitrogen element-containing compound, and a carrier that has a core material and a nitrogen element-containing coating resin layer, in which a content of the nitrogen element-containing compound with respect to the silica particles is 0.005% by mass or more and 0.5% by mass or less in terms of a nitrogen element, and in a case where A represents a pore volume of pores that the silica particles include and have a diameter of 1 nm or more and 50 nm or less, which is determined from a pore size distribution curve obtained by a nitrogen adsorption method before baking of the silica particles at 350° C.

Abstract: An electrostatic charge image developing toner contains negatively charged toner particles and silica particles added to an exterior of the toner particles, in which in a case where the silica particles are sorted into silica particles (S1) having a circularity of 0.91 or more and silica particles (S2) having a circularity less than 0.91, a mass ratio N/Si of a nitrogen element to a silicon element in a group of the silica particles (S1) is 0.005 or more and 0.50 or less, a mass ratio N/Si of a nitrogen element to a silicon element in a group of the silica particles (S2) is less than 0.005, and an average circularity of the silica particles (S2) is 0.84 or more and less than 0.91.

Abstract: An electrostatic charge image developing toner contains toner particles, silica particles (A) that are added to an exterior of the toner particles and contain a nitrogen element-containing compound containing a molybdenum element, and inorganic particles (B) that are added to the exterior of the toner particles and other than the silica particles (A), in which in the silica particles (A), a ratio NMo/NSi of Net intensity NMo of the molybdenum element measured by X-ray fluorescence analysis to Net intensity NSi of a silicon element measured by X-ray fluorescence analysis is 0.035 or more and 0.45 or less, and an average primary particle size of the inorganic particles (B) is 10 nm or more and 80 nm or less.

Abstract: An electrostatic charge image developing toner contains toner particles, titanic acid compound particles that are added to an exterior of the toner particles, have a peak existing in a range of 20 nm or more and less than 80 nm in a number-based primary particle size distribution curve, and have an average circularity of 0.88 or more and 0.

Abstract: An electrostatic charge image developing toner contains toner particles, silica particles that are added to an exterior of the toner particles, and titanic acid compound particles that are added to the exterior of the toner particles and have an average circularity of 0.890 or more and 0.950 or less, in which the silica particles include particles having a primary particle size of 80 nm or less, the particles having a primary particle size of 80 nm or less have at least one peak in a range of 20 nm or more and less than 80 nm in a number-based primary particle size distribution curve (hereinafter, silica particles having such a peak will be called “specific silica particles”), the titanic acid compound particles have at least one peak in a range of 20 nm or more and less than 80 nm in a number-based primary particle size distribution curve, a difference between an average circularity of the specific silica particles and the average circularity of the titanic acid compound particles is 0.

Abstract: A toner for developing an electrostatic charge image contains toner particles having an average circularity Cc of 0.98 or more; and external additives including monodisperse silica particles having an average diameter of primary particles of 20 nm or more and 70 nm or less and titanate particles having an average diameter of primary particles of 20 nm or more and 70 nm or less, wherein the absolute difference between the average diameter of primary particles of the monodisperse silica particles and the average diameter of primary particles of the titanate particles is 25 nm or less.

Abstract: A toner for developing an electrostatic charge image includes toner particles having an average circularity Cc of 0.80 or more and less than 0.98, and an external additive containing monodisperse silica particles and titanate compound particles, in which a ratio Rt/Rs of an average primary particle diameter Rt of the titanate compound particles to an average primary particle diameter Rs of the monodisperse silica particles is 0.50 or more and 3.50 or less, and a ratio A/B of an external additive coverage A (%) of the monodisperse silica particles on surfaces of the toner particles to an external additive coverage B (%) of the titanate compound particles on the surfaces of the toner particles satisfies formula (1): 0<A/B?2.00.

Abstract: An electrostatic charge image developing toner includes toner particles, and an external additive that contains particles A containing a perovskite-type compound and having an equivalent circle diameter of 15 nm or greater and 90 nm or less and particles B containing a perovskite-type compound and having an equivalent circle diameter of 1.0 ?m or greater and 3.0 ?m or less, in which the particles B occupy 0.3% by number or greater and 3.5% by number or less of an entirety of the toner particles.

Abstract: An electrostatic charge image developing carrier includes a magnetic particle and a coating resin layer that covers the magnetic particle, and an amount of the coating resin layer that is peeled off from the magnetic particle when the carrier dispersed in water is irradiated with ultrasonic waves, relative to a coating amount of the coating resin layer before ultrasonic irradiation, is 800 mass ppm or more and 2,000 mass ppm or less, and a difference between an initial coating amount of the coating resin layer of a carrier having no travel history and a coating amount of the coating resin layer of a carrier having a travel history and being taken out from an electrostatic charge image developer, relative to the initial coating amount of the coating resin layer, is 0 mass ppm or more and 3,000 mass ppm or less.